City of O'Fallon, MO
St. Charles County
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Table of Contents
Table of Contents

Section 405.130 Initial Considerations.

[R.O. 2007 §405.130; Ord. No. 1499 §§500.0—500.1, 8-17-1987; Ord. No. 5337 §1, 6-26-2008]
In the City Council's consideration of applications for plat approval, the standards set forth in this Article shall be considered minimum requirements.

Section 405.140 through Section 405.170. (Reserved)

Section 405.180 Utility Easement.

[R.O. 2007 §405.180; Ord. No. 1499 §§505.0—505.3, 8-17-1987; Ord. No. 3042 §1, 7-21-1993; Ord. No. 3145 §2, 9-2-1994; Ord. No. 4591 §1, 11-18-2003; Ord. No. 4872 §3, 7-20-2005; Ord. No. 4875 §3, 8-1-2005; Ord. No. 5337 §1, 6-26-2008]
A. 
Utility Easement Requirements.
1. 
Utility easements. Utility easements, where required, shall be at least ten (10) feet wide (five (5) feet on each side of the lot line) along rear, front and side lot lines. Easements of adequate width shall be provided for open drainage channels and rear yard swales, where required. Easements five (5) feet in width may be allowed for underground cable installations. Telephone and electric power lines shall be located underground, except in subdivisions where all of the lots are twenty thousand (20,000) square feet or larger in size, and then the developer will have the option of underground or overhead utility lines.
2. 
Utility/roadway easements. A minimum of ten (10) foot utility/roadway easement shall be required adjacent to all City, County and State right-of-way. Such utility/roadway easements shall also include working space to work on such utility and/or roadway.
3. 
All underground public utility installations, including lines for street lighting systems, which traverse privately owned property, shall be protected by easements granted by the developer to the appropriate public utility and reasonably approved by the public utility. Such easements shall be so located as to not interfere with the use of any lot or other part of the subdivision. The size of, and restrictions pertaining to, such easements shall be in accordance with the legally adopted or reasonable standards and the specifications of the agency having jurisdiction over the utility lines and subdivision and shall be indicated on the record plat submitted for approval.
4. 
Where a cut or fill for a street extends beyond the limits of the right-of-way, the developer shall provide a slope easement as determined by the City Engineer to be of sufficient area and limits to permit the construction and maintenance of the slope.
5. 
Stormwater easements and drainage rights-of-way may be required by the City of O'Fallon if necessary for proper drainage within or through a subdivision. Whenever a stream or surface drainage course conveying a minimum of one and one-half (1.5) cfs in a 15-year, 20-minute storm is located in or planned for an area proposed for a subdivision, the developer shall provide a minimum ten (10) foot wide easement or wider as determined by the City Engineer to be adequate in area to contain facilities, to control flooding or erosion along said stream or surface drainage course and protect the facility from blockages. Said easements shall be shown on the record plat.

Section 405.190 (Reserved)

Section 405.200 Street Name Signs and Street Names.

[R.O. 2007 §405.200; Ord. No. 1499 §507.0, 8-17-1987; Ord. No. 5337 §1, 6-26-2008]
A. 
Street name signs meeting the requirements of the City of O'Fallon shall be erected by the subdivider at all intersections.
B. 
Stop signs, yield signs, etc., non-illuminated, non-electric, reflectorized shall conform to "current" Manual on Uniform Traffic Control Devices and be provided by the developer as determined by the City of O'Fallon.
C. 
Whenever a new street is constructed along the approximate alignment or extension of an existing street, its name shall be the same as that of the existing one.
D. 
Whenever a cul-de-sac street serves not more than three (3) lots, the name of the intersecting street shall apply to the cul-de-sac.
E. 
To avoid duplication and confusion, the proposed names of all streets shall be approved by St. Charles County prior to preliminary plat approval and such names being assigned or used.

Section 405.210 Construction Requirements.

[R.O. 2007 §405.210; Ord. No. 1499 §§508.0—508.5, 8-17-1987; Ord. No. 3145 §§3—5, 9-2-1994; Ord. No. 4680 §1, 6-28-2004; Ord. No. 4875 §5, 8-1-2005; Ord. No. 5337 §1, 6-26-2008]
A. 
Public Street Construction. Streets shall be graded to full width of the right-of-way and fully constructed of asphaltic concrete or Portland cement concrete pavements in accordance with the Standard Specifications of St. Charles County Highway Department (2006) except as modified in the City's codes or ordinances and as hereinafter specified in this Subsection.
[Ord. No. 6335 § 1, 4-13-2017]
1. 
Section 501.2.2 of the St. Charles County Highway Department (2006) shall be modified to include the following requirement:
a. 
Only concrete mix design specifications that have been vetted and approved by the Eastern Missouri Pavement Consortium (EMPC) shall be used for construction of public concrete pavements, including streets, sidewalks, and curbs. This includes roadways that are not yet public but intended to become public roadways upon dedication and acceptance by the City.
2. 
Section 605.3 of the St. Charles County Highway Department (2006) shall be modified to include the following requirement:
a. 
Underdrains shall be required and installed per Exhibit A in Appendix D of the O'Fallon City Municipal Code (Section 405.390(A)(5). Underdrains are required to be installed at all inlets. If a roadway has an open type drainage system, underdrains are to be installed every five hundred (500) feet.
3. 
Section 1005.2.1 of St. Charles County Highway Department (2006) shall be modified to include the following requirements:
a. 
A representative sample of proposed limestone, calcitic dolomite or other mineral referred to as "limestone" that is used for coarse aggregate for concrete shall undergo appropriate testing, by an independent 3rd party testing agency to determine and verify that the coarse aggregate to be utilized does not exhibit, and is not susceptible to, Alkali-Carbonate Reaction (ACR). Said 3rd party testing agency or agencies will need to be a City approved agency that is experienced in performing the necessary tests.
b. 
For ACR testing, the testing performed shall include ASTM C295, ASTM C586 and ASTM C1105. The agency performing these tests must be informed prior to testing to look specifically for the potential of ACR and the reports generated from the testing shall specifically address the potential of ACR in the text. This testing shall be performed for each ledge within a quarry that is planned to be used for concrete pavement within the City of O'Fallon.
c. 
The following requirements pertain to the ASTM C295 test. For the first two (2) years of this requirement, the tests shall be made within six (6) months of the planned use in concrete. After the first two (2) years of testing within a quarry, the City Engineer may allow the interval between tests to go up to one (1) year if there is convincing evidence to show this is warranted. The petrograph test shall be performed by a petrographer experienced in identifying ACR-prone dolomitic limestone or calcitic dolomite. The reports of the testing noted herein shall be submitted to the City with the concrete mix design submittal.
d. 
The following requirements pertain to the ASTM C586 and ASTM C1105 tests. These test reports shall be required to be submitted to the City beginning on August 1, 2017. The period of time from approval of this ordinance to when the reporting is required to be submitted allows time for the tests to be completed. For the first two (2) years of this requirement being in place, these tests shall be made within twelve (12) months of the planned use in concrete pavement. After the first three (3) years of testing within a quarry, the City Engineer may allow the interval between tests to go up to two (2) years if there is convincing evidence to show this is warranted.
e. 
In lieu of performing the above testing, Meramec Gravel can be utilized for coarse aggregate in Portland cement concrete pavement. The coarse aggregate shall be Meramec gravel meeting Missouri Department of Transportation current "Missouri Standard Specifications for Highway Construction," Section 100.5.1.5 Gradation "D."
f. 
All coarse and fine aggregate material utilized for Portland cement concrete pavement shall have been inspected and approved by the Missouri Department of Transportation (MoDOT) for said use. If MoDOT inspection is not available, a 3rd party testing agency that is experienced in performing the necessary test will need to be approved by the City. The delivery ticket shall be marked to indicate that the rock has been tested and meets MoDOT specifications.
g. 
Coarse aggregate utilized for Portland cement concrete pavement shall only be used from rock ledges that have been inspected and accepted by MoDOT for said use. If MoDOT inspection is not available, a 3rd party testing agency that is experienced in performing the necessary test will need to be approved by the City.
h. 
A complete copy of the results of the above referenced testing, as well as, mix design submittal information, MoDOT certifications and other associated certifications required per this ordinance and per the Standard Specifications of St. Charles County Highway Department (2006) specification shall be submitted to the City a minimum of seven (7) days prior to the placement of the concrete. The City must be in agreement with said test results, mix designs and certifications prior to the placement of any concrete.
4. 
Section 1007.3.1 of the St. Charles County Highway Department (2006) shall be modified to include the following requirement:
a. 
For all granular base material deliveries, the delivery ticket must be annotated or signed by the rock supplier to indicate that the granular base material meets the Missouri Department of Transportation (MoDOT) requirements for Type 5 aggregate for base. This ticket must be submitted to the City for record-keeping purposes at the time of delivery. Any deliveries made without the proper delivery tickets, including signature, will not be accepted for use. In lieu of a signature on the delivery ticket a separate product certification sheet with a signature of the company's quality control manager may be provided to go with the delivery tickets. The product certification sheet must be current, dated to within four (4) weeks of the date of delivery and also list the project name or jobsite location.
B. 
Approval Of Subgrade And Base (Subbase). The City Engineer or representative shall approve the subgrade before any base is placed thereon and shall approve the base before concrete or surface course is placed. The subgrade and base shall be so constructed that it will be uniform in density throughout.
1. 
In all fill areas in the roadways, soil tests shall be submitted and approved by the City Engineer for each foot of fill and at least one (1) test and an average of one (1) test within every two hundred fifty (250) feet.
2. 
No traffic will be allowed on new concrete pavement until it has cured for seven (7) days and it reaches three thousand five hundred (3,500) psi. Concrete pavements shall not be approved unless it reaches a strength of four thousand (4,000) psi within twenty-eight (28) days.
3. 
Prior to placement of aggregate base material on subgrade and prior to placement of pavement on base material, the subgrade and base must be proof-rolled with a fully loaded (ten (10) ton load) tandem truck or equivalent tire vehicle with one (1) pass down each driving lane no faster than three (3) miles per hour. If soft spots are detected, or pumping, rutting or heaving occurs greater than one (1) inch at the subgrade, the roadbed shall be considered unsatisfactory and the soil in these areas shall be remediated to the depth indicated by the contractor's testing firm and approved by a representative of the City Engineer.
4. 
Subgrade and base beneath pavements shall be compacted to St. Charles County Highway Department specifications. The moisture range shall be determined by the Standard or Modified Proctor Density Method AASHTO T-99 and within -2/+4 percentage points of the optimum moisture content.
5. 
The entire width and length will conform to line, grade and cross section shown on the plans or as established by the engineer. If any settling or washing occurs, or where hauling results in ruts or other objectionable irregularities, the contractor shall improve the subgrade or base to the satisfaction of the City before the pavement is placed. Additional rolling or methods to verify compaction shall be at the discretion of the City Engineer. Tolerance allowed on all lines, grades and cross sections shall be plus or minus four-hundredths (+0.04) feet.
C. 
Utility Work Prior To Base Construction. No base course work may proceed on any street until all utility excavations (storm and sanitary sewers, water, gas, electric, etc.) have been properly backfilled with granular material, crushed stone or gravel mechanically tamped in ten (10) inch lifts. Utilities installed after subgrade preparation shall be bored. Compaction requirements shall follow St. Charles County standards (2006).
D. 
Outside (beyond) the pavement limits, excavations shall be jetted with water and allowed to set for a length of time satisfactory to the City Engineer.
1. 
Jetting. Granular materials and earth materials associated with new construction beyond the pavement may be jetted, taking care to avoid damage to newly laid sewers. The jetting shall be performed with a probe route on not greater than seven and one-half (7.5) foot centers with the jetting probe centered over and parallel with the direction of the pipe. Trench widths greater than ten (10) feet will require multiple probes every seven and one-half (7.5) foot centers.
a. 
Depth. Trench backfill less than eight (8) feet in depth shall be probed to a depth extending to half the depth of the trench backfill, but not less than three (3) feet. Trench backfill greater than eight (8) feet in depth shall be probed to half the depth of the trench backfill but not greater than eight (8) feet.
b. 
Equipment. The jetting probe shall be a metal pipe with an exterior diameter of one and one-half (1.5) to two (2) inches.
c. 
Method. Jetting shall be performed from the low surface topographic point and proceed toward the high point, and from the bottom of the trench backfill towards the surface. The flooding of each jetting probe shall be started slowly allowing slow saturation of the soil. Water is not allowed to flow away from the ditch without first saturating the trench.
d. 
Surface bridging. The contractor shall identify the locations of the surface bridging (the tendency for the upper backfill crust to arch over the trench rather than collapse and consolidate during the jetting process). The contractor shall breakdown the bridged areas using an appropriate method such as wheels or bucket of a backhoe. When the surface crust is collapsed, the void shall be backfilled with the same material used as trench backfill and rejetted. Compaction of the materials within the sunken/jetted area shall be compacted such that no further surface subsidence occurs.
E. 
Required Joint Details In Concrete Streets And Driveways. Construction joints shall be required in all concrete roadways as a normal requirement. St. Charles County Highway Department standard specifications shall apply. Additionally:
1. 
Transverse construction joints shall be spaced sixteen (16) feet apart.
2. 
Longitudinal construction joints shall be Type C with bars.
3. 
Expansion joint A-2, from St. Louis County pavement construction details, shall be allowed in addition to Type A and AA expansion joints.
4. 
Expansion joints in the driveway approach area shall be two (2) inches wide and full depth at the back of curb. In all cases if the driveway approach depth exceeds the minimum six (6) inches thickness, the joint material shall extend the full depth of pavement, no concrete to concrete interface.
5. 
The expansion joint between the driveway and garage floor shall be a minimum of two (2) inches and full depth of slab.
6. 
The developer's engineer shall identify on the record plat any lot for which special precautions should be taken to prevent damage to any structure caused by the forces commonly known as "street creep". The developer's engineer shall also recommend any special construction technique required to counter the forces.
F. 
Material Testing And Frequency. Materials for construction shall be tested and inspected per the appropriate ASTM code or at the City Engineer's discretion. The developer's engineer shall perform the following quality control guidelines:
1. 
Concrete.
a. 
Cylinders/compressive strength. One (1) set of four (4) cylinders within the first fifty (50) cubic yards and one (1) set per one hundred (100) cubic yards thereafter. One (1) cylinder must be tested at seven (7) days, one (1) at fourteen (14) days and two (2) at twenty-eight (28) days. If the first (1st) cylinder does not meet specifications at twenty-eight (28) days, then the second (2nd) cylinder must be held and tested at day fifty-six (56).
b. 
Percent air and temperature. First (1st) truck batch each day and two (2) thereafter until a consistency is encountered. Once a consistency is encountered, then tests will be performed in conjunction with the concrete cylinders.
c. 
Slump. First (1st) truck batch each day and two (2) thereafter until a consistency is encountered. Once a consistency is encountered, then tests will be performed in conjunction with the concrete cylinders.
d. 
If concrete is batched from more than one (1) plant, then the aforementioned guidelines will be applicable to each plant.
2. 
Subgrade and base.
a. 
Proof roll as described in Section 405.210(B).
b. 
One (1) compaction test per two hundred fifty (250) feet of mainline paving, three (3) tests per intersection, five (5) tests within cul-de-sacs and one (1) test per repair slab.
c. 
Gradation test for subbase material.
3. 
Asphalt.
a. 
One (1) set of compaction tests per two hundred fifty (250) feet of mainline. One (1) set includes three (3) tests across the paved lane at the same station.
b. 
One (1) bulk density test per paving operation.
4. 
Site grading.
a. 
Within City right-of-way. Material is to be placed in eight (8) inch to twelve (12) inch loose lifts and compacted per the approved compaction requirements. One (1) compaction test will be performed every two hundred fifty (250) feet along the centerline for each lift.
b. 
Outside of City right-of-way. Material is to be placed in eight (8) inch to twelve (12) inch loose lifts and compacted per the approved compaction requirements. One (1) compaction test will be performed at two (2) foot vertical intervals and approximately every one thousand (1,000) cubic yards.
5. 
Quality control reports.
a. 
Daily. Descriptive daily reports are required for each day a representative is present on site from the quality control company (soil testing firm). At a minimum, the daily report should include representative on site, date, materials observed, activities performed, weather, recommendations or concerns made and to whom.
b. 
Proctor reports. Must have a valid Proctor value prior to testing on site. At a minimum, the Proctor curve provided must include sample location and must have five (5) density points (values) and moisture (values) listed on the document, optimum moisture content, maximum dry density, zero air voids curve and assumed specific gravity, natural moisture content, Proctor type and procedure, liquid limit, plastic limit.
c. 
Compaction report. At a minimum, the compaction reports will include elevation of test and rod depth, station/specific location, Proctor type, optimum moisture content, maximum lab dry density, in-place moisture content, in-place dry density, percent compaction, does/does not comply with specification requirements, specification requirements, material type, weather, date. If a drawing is needed to show location of the tests, the drawing must be professionally done or at least on sheet copy of the plans. No hand drawings will be accepted.
d. 
Concrete report. At a minimum, the field concrete report will include location of concrete placed, representative on site, date, weather, concrete supplier, ticket and truck number, time truck arrived on site, time concrete poured, air temperature, concrete temperature, mix type, strength requirement, water added, slump (actual and required), air content (actual and required), number of cylinders cast, overnight temperature, overnight storage temperature, date received at lab. At a minimum, the laboratory concrete field report will include age (days) of test, test date, cylinder diameter, cylinder area, load (pounds), compressive strength (psi), does/does not comply with specification requirements.
6. 
Equipment calibration. The developer's contractors and subcontractors must have their equipment calibrated by the following minimum standards.
a. 
Air meter—weekly.
b. 
Cylinder compression—annually by independent calibration service.
c. 
Batch scales—monthly.
d. 
Nuclear testing devices—every six (6) months.
e. 
Proctor equipment—every six (6) months.
f. 
Slump cone—monthly.

Section 405.220 Monuments Required.

[R.O. 2007 §405.220; Ord. No. 1499 §509.0, 8-17-1987; Ord. No. 5337 §1, 6-26-2008]
A. 
As part of public street construction, sufficient permanent and distinguished monuments shall be accurately placed throughout the subdivision so that street alignment may be traced with accuracy. Such monuments shall be in the form of iron pins not less than one-half (½) inch in diameter and three (3) feet long driven into the earth, or spikes not less than six (6) inches long driven into the pavement, or of something equal. Such monuments shall be installed by the subdivider as soon as reasonably possible. The location of such monuments shall be indicated on the final plat and shall be placed in accordance with the following requirements:
1. 
Street points. Monuments shall be set at the intersection of all streets and the beginning and end of all curves along street centerlines.
2. 
Curb marks. Curbs shall be permanently marked at the beginning and end of all curves and at the prolongation of all lot side lines.

Section 405.230 Public Storm Sewers and Other Drainage Appurtenances.

[R.O. 2007 §405.230; Ord. No. 1499 §§510.0—510.3, 8-17-1987; Ord. No. 1562 §1, 3-3-1988; Ord. No. 3145 §6, 9-2-1994; Ord. No. 5337 §1, 6-26-2008]
A. 
In addition to the installation of curbs or gutters along the streets as required by this Chapter, storm sewers shall be required. Such systems will be equipped with adequate basins, inlets and outlets and shall be constructed in accordance with the applicable provisions in the specifications. The stormwater drainage system shall be separate and independent of the sanitary sewer system. The plans and specifications for the disposing of stormwater shall be approved by the City Engineer.
B. 
General. All construction details and specifications pertaining to stormwater drainage shall be in accordance with the City of O'Fallon's requirements unless otherwise noted herein. A registered engineer's seal is required on all drainage plans submitted for approval.
C. 
Design Criteria. All stormwater design is to be by the Rational Method, except that in certain large developments, the use of other methods of analysis such as the Unit Hydrograph will be considered for stormwater design. However, prior approval must be obtained from the City Engineer at the preliminary design stage, where use of the Unit Hydrograph or other methods of analysis are requested.
1. 
Runoff factors based on 15-year design storm frequency are generally as follows:
a. 
1.7 c.f.s. per acre, five percent (5%) impervious for parks and large perpetual charter cemeteries;
b. 
1.9 c.f.s. per acre, fifteen percent (15%) impervious for one (1) acre or larger tracts, single-family residences;
c. 
2.0 c.f.s. per acre, twenty percent (20%) impervious for one-half (½) acre lots;
d. 
2.2 c.f.s. per acre, thirty percent (30%) impervious for small non-perpetual charter cemeteries;
e. 
2.4 c.f.s. per acre, forty percent (40%) impervious for single-family residences, ten thousand (10,000) square feet or less;
f. 
3.0 c.f.s. per acre, seventy percent (70%) impervious for multi-family apartments, condominiums, etc.;
g. 
3.5 c.f.s. per acre, one hundred percent (100%) impervious for developed manufacturing and industrial areas.
Note: Drainage areas may be broken down into component areas, with the appropriate runoff factor applied thereto: e.g., an apartment complex may show 3.5 c.f.s. per acre for roofed and paved areas and 1.7 c.f.s. per acre for grassed areas.
2. 
25-year frequency rainfall can be obtained by the factor of 1.18 times the 15-year frequency rainfall.
3. 
50-year frequency rainfall can be obtained by the factor of 1.28 times the 15-year frequency rainfall.
4. 
100-year frequency rainfall can be obtained by the factor of 1.39 times the 15-year frequency rainfall.
5. 
The runoff factors shall also include a factor to account for ground saturation. The runoff factors shall be increased by the following:
a. 
15-year design storm—1.1.
b. 
25-year design storm—1.15.
c. 
50-year design storm—1.20.
d. 
100-year design storm—1.25.
6. 
Using the above factors the values are as follows:
Area
15 Year
25 Year
50 Year
100 Year
Parks
1.87
2.31
2.61
2.95
1 acre, single-family
2.09
2.58
2.92
3.30
½ acre, single-family
2.20
2.71
3.07
3.48
Small cemeteries
2.42
2.99
3.38
3.82
10,000 square feet single-family
2.64
3.26
3.69
4.17
Multi-family
3.30
4.07
4.61
5.21
Commercial and industrial
3.85
4.75
5.38
6.08
D. 
Drainage Structures. All structures shall be designed for HS20-44 loading.
1. 
Bridges. Bridges shall be designed for the 100-year storm frequency and provide two (2) feet of freeboard between the bottom of superstructure and high water elevations.
2. 
Culverts.
a. 
Crossroad culverts, not at low points, shall be designed on a storm frequency of fifteen (15) years with entrance control and two (2) feet of freeboard at the shoulder line.
b. 
Culverts, at or near low points in floodplains, shall be designed on a storm frequency of one hundred (100) years with entrance control and two (2) feet of freeboard at the shoulder line.
c. 
Culverts, at or near low points not in floodplains, shall be designed on a storm frequency of fifty (50) years with entrance control and two (2) feet of freeboard at the shoulder line.
3. 
Roadways. Whenever a watercourse is proposed or exists within proximity of and is approximately parallel to an existing or proposed roadway, the low shoulder elevation of the roadway shall be established from the high water elevation with one (1) foot of freeboard in non-floodplain areas and two (2) feet of freeboard in floodplain areas.
4. 
Street inlets. In certain cases, where steep grades or other unusual conditions are encountered, a grated trough may be required in lieu of multiple inlet structures upstream in order to eliminate excessive by-pass.
5. 
Pipes.
a. 
Pipes within the public right-of-way or easement shall be reinforced concrete pipe (RCP) ASTM C-76, Class III, and a minimum of twelve (12) inches diameter. Design calculations may be submitted allowing a lower class of RCP.
The use of high density polyethylene (HDPE) shall be allowed following Metropolitan St. Louis Sewer District (MSD) requirements which include meeting AASHTO M-294 Type S, or ASTM F-2306 with joints meeting the performance test requirements of ASTM D-3212. HDPE pipe installations shall utilize standard concrete drainage structures and flared end sections and be limited to twelve (12) inch through twenty-four (24) inch diameters.
The use of corrugated steel M-36, minimum sixteen (16) gauge asphalt polymer, or aluminized coating, a minimum of eighteen (18) CSP, will be allowed with these conditions.
(1) 
The City Engineer shall review the proposed project for suitability.
(2) 
Standard concrete drainage structures and flared end sections will be used in the installation process.
(3) 
Installation shall be in accordance with ASTM D-2321 and/or manufacturer's recommendation, whichever is more stringent.
The required stormwater hydraulics shall be submitted with all types of pipes.
b. 
Pipe reduction will not be allowed downstream of public right-of-way.
c. 
In situations where storm pipe cover is less than three (3) feet, calculations will be required to determine the class or gauge of pipe.
d. 
All pipe shall be installed with O-ring rubber type gaskets per MSD Standard Construction Specifications. Connections at all structures are to be made with rubber watertight A-lock joints or approved equals.
e. 
Pipes normally should be sized using the partial flow design, however, under special circumstances, full flow design will be allowed provided hydraulic grade line information is shown indicating adequate freeboard. This additional information will be supplied for the 15-, 25- and 100-year storms.
f. 
Freeboard requirements will be two (2) feet from the inlet sill or manhole top.
E. 
Plans And Calculations.
1. 
General. Plans shall be any scale from one (1) inch equals ten (10) feet through one (1) inch equals one hundred (100) feet so long as the scale is an increment of ten (10) feet. Plans shall be prepared on exhibits twenty-three and one half (23½) by thirty-four and one-half (34½) inches. All calculations submitted shall be in accordance with Section 405.100 and shall include the following information.
2. 
Site drainage map. A drainage map is required and should be developed from a base reproduction of the site plan or grading plan. The map must include the following information:
a. 
Existing and proposed contours, normally at two (2) foot intervals for the subject property, extending off site as required for proper design of proposed improvements. Contour intervals other than the above as determined by the topography. Use U.S.G.S. Datum only.
b. 
Location of existing and proposed property lines, streets, sinkholes, area within the tract subject to inundation by stormwater, railroads, easements of record and other significant natural features such as wooded areas and rock formations, etc.
c. 
All existing and proposed stormwater facilities, such as inlets, manholes, pipes, culverts, bridges, channels, etc.
d. 
All existing and proposed improvements where required for proper design review, which may include, but not be limited to, pavement, curbs, sidewalks, buildings, utilities, etc.
e. 
Existing waterways, including names; if not named, an indication of any branch, creek or river to which the waterways are tributary.
f. 
Runoff details are required showing flows tributary to each proposed and existing structure and cumulative flows in pipes and gutters; include "Q" area.
g. 
All existing bodies of water (such as lakes or ponds) indicating surface area and elevation.
3. 
Supplemental drainage map. A supplemental map may be required and should be developed from a portion of U.S.G.S. Quadrangle Map. This map must include the site boundary and the watershed tributary to the project area.
4. 
Surface drainage. The following information shall be provided by the developer.
a. 
No sheet flow over one (1) c.f.s. will be allowed over terraces with slopes that are and/or greater than five (5) feet in height. Berms and/or swales shall be provided to collect the flow at the top of the terrace and carry it to a drainage structure. Total accumulation inside berm and/or swales shall be a maximum of three (3) cubic feet per second.
b. 
Excluding existing creeks and swales not being modified by the proposed development, the developer's engineer shall provide critical cross sections, profiles and hydraulic computations for ditches and swales with flows in excess of one (1) c.f.s. and creeks with flows in excess of three (3) c.f.s.
5. 
Location of drainage structures. The lateral location of all drainage structures shall be shown by street centerline stationing and perpendicular offset distance, and in large lot subdivisions, by referencing to rear lot line, in addition to the following requirements:
a. 
Inlets shall be appropriately sized and spaced, taking into consideration by-pass, depth of flow and width of spread of flow in gutters.
b. 
For inlets in vertical sag curves, the center of the main chambers shall be placed within one (1) foot of the exact mathematical low point.
c. 
All manholes shall be located outside of the proposed roadway pavements.
d. 
Inlets shall be located as follows:
(1) 
Inlet face shall be one (1) foot behind the back of the roadway curb of asphalt streets and two (2) feet behind the back of roadway curb for concrete streets. The sump shall begin two (2) feet in front of the back of the curb. The top elevation shall remain three (3) inches above the top of the rolled curb and level with the top of the vertical curb. When required, the nearest two (2) sections of sidewalk on each side of the inlet shall be warped down to meet the top of the inlet stone elevation. The curb approach to the inlet shall start at five (5) feet upstream of the inlet wall and three (3) feet downstream of the inlet wall. This approach shall be on a direct line to the inlet and not curved.
(2) 
The flow lines of incoming and outgoing storm pipes shall maintain a two-tenths (0.2) foot drop through the inlet with the same size pipes or provide a drop equal to the difference of eighty percent (80%) of the pipe diameters on different size pipes.
(3) 
Location of area inlets in roadway ditches shall be compatible with ultimate improvements at an elevation compatible with the shoulders and sidewalks.
(4) 
Inlets shall be placed at intersections such that no part of the inlet structure or sump is in the street corner rounding.
e. 
By-pass shall be minimized at inlet structures and shall be shown on the hydraulic computations and site drainage map. No greater than one (1) c.f.s. of stormwater shall be allowed to cross an intersection.
f. 
Where termination of pavement occurs, erosion protection in the form of asphalt curb, gutters, additional structures, paving and/or revetment may be required.
g. 
Data required on plans and/or profiles shall include:
(1) 
Type of drainage structure (single, double, grated, etc.).
(2) 
Flow line and top elevations.
(3) 
"Q" in upstream gutter line or drainage swale.
(4) 
The hydraulic grade line of the structure may be shown on the plan, profile or computation sheets.
(5) 
Attach hydraulic computations.
h. 
For non-standard structures, two (2) additional sets of plans shall be submitted for review.
6. 
Pipes.
a. 
The following information shall be shown on the plans and/or profiles:
(1) 
Location and length of pipes;
(2) 
Grade;
(3) 
Alignment; and
(4) 
Curve data for radius pipes.
Note: On intake structures, such as flared end section or headwalls, entrance control shall be applied. Two (2) foot minimum freeboard is required based on the 15-year, 20-minute storm. Check for inundation upstream. Toe walls are required to be two (2) feet deep on headwalls upstream, three (3) feet deep on headwalls downstream.
b. 
Outfall termination shall conform to the following:
(1) 
All outfall pipes shall be concrete and have a reinforced concrete headwall or flared end section with cutoff wall and revetment to protect from scour.
(2) 
If discharge is at a property line, discharge easements will be acquired on affected adjacent properties prior to approval of the City Engineer. A guarantee will be required for future extension of the outfall to the property line. Open trenching of roadway pavements will normally be permitted on minor residential streets only.
Note: Road closings will not be permitted without approval of the City Engineer. Contractors will be required to maintain one (1) lane open to traffic at all times or to devise and implement a detour plan approved by the City Engineer.

Section 405.240 Stormwater Detention.

[R.O. 2007 §405.240; Ord. No. 1499 §§511.0—511.8, 8-17-1987; Ord. No. 4743 §§5—6, 11-22-2004; Ord. No. 5337 §1, 6-26-2008]
A. 
Policy. It is the policy of the City of O'Fallon to protect and promote the public health, safety and general welfare. The criteria for stormwater detention will:
1. 
Reduce the possibility of damage to public and private property,
2. 
Reduce the erosion of land and creek channels,
3. 
Assist in the attainment and maintenance of water quality standards, and
4. 
Preserve and enhance the environmental quality of the watercourses in the City. This criteria provides uniform procedures for designing and checking the design of storm drainage detention systems.
B. 
General Guidelines.
1. 
Applicability. This Chapter shall apply to all development within the corporate limits of the City of O'Fallon, Missouri. Residential developments having a total area of less than five (5) acres and commercial or industrial developments having a total area of less than one (1) acre may be given a waiver by the City in accordance with Article V of this Chapter subject to the following conditions:
a. 
The City retains the right to require detention storage in all cases in which the proposed development will generate excess runoff that adversely affects the carrying capacity of the receiving watercourse.
b. 
Developments less than one (1) acre with less than thirty percent (30%) of the area paved and developments generating less than one (1) cubic foot per second per acre (cfs/acre) increased runoff shall not be required to provide detention storage unless condition in Subsection (B)(1)(a) above is applicable.
c. 
This Chapter shall apply for all newly platted areas and new developments proposed after August 17, 1987. All developments that have an approved preliminary plan by the Planning and Zoning Commission at the time of the approval of this Chapter will not have to conform to this Chapter.
2. 
Affidavit of disclosure of property interest. The effective acreage for a site is not limited to a fractional part of the total. If a project is developed in phases or small plats, the total acreage of the project site must be considered. At the time the owner of any development submits a preliminary plat or preliminary plan, the owner shall also identify to the City all contiguous property or property in the watershed that he/she has interest in.
3. 
Method of evaluation. The storage capacity and discharge rate shall be based upon the calculated volume and peak flow of the stormwater runoff, respectively. The calculations for sites having an area of one hundred (100) acres or less shall be made using either the Soil Conservation Service Method or the Rational Method. If the site is larger than one hundred (100) acres, then the engineer shall use the Soil Conservation Service Method. If another method is desired to be used, the engineer shall submit a proposed method of evaluation for the calculations for review and approval. The permitted discharge rate of stormwater runoff shall be determined by calculating the rate of runoff for the site's pre- and post-development conditions. The engineer shall determine the most critical storm looking at three (3) different time periods:
a. 
The time of concentration,
b. 
A 1-hour storm, and
c. 
A 24-hour storm.
4. 
Detention of differential runoff. All new developments shall provide a storm water detention facility that insures that the rate of flow of storm water runoff discharge from the site after development for a two-year, fifteen-year and twenty-five-year twenty-minute storm, unless given a waiver by the City in accordance with Article V of this Chapter. Data shall be submitted for the two-, fifteen-, twenty-five- and one-hundred-year frequency twenty- minute storms.
[Ord. No. 6207 § 16, 4-28-2016]
a. 
If the proposed or modified development is in the Peruque or Belleau Creek watershed, then detention of the differential runoff shall also be provided for the one-hundred-year twenty-minute storm. Data shall be submitted for the two-, fifteen-, twenty-five- and one-hundred-year frequency 20-minute storms. The maximum ponding elevation shall be calculated based on a routing of the design storm assuming the low flow outlet is blocked with the water ponded to its maximum elevation. A minimum of one (1) foot of freeboard shall be provided from the top of the basin to the maximum ponding elevation.
5. 
Flows from upstream areas. Flows from upstream areas outside the site should be based upon the assumption that those areas are fully developed under forecast land use patterns. The required storage volume will be based upon the site only, with flows from upstream areas being by-passed or discharged via overflow spillways or other devices for the 100-year storm.
6. 
Facilities in floodplains. If detention storage is provided within a floodplain, only the net increase in storage volume above that which naturally existed on the floodplain shall be credited to the development. No credit will be granted for volumes below the elevation of the base flood at that location unless compensatory storage is also provided. Where encroachments in the existing floodplain fill the valley storage areas, an equal amount of detention volume shall be provided.
7. 
Land credit for detention facilities. The number of units/lots shall be based on the total area of the tract to be developed. All areas to be used as detention facilities shall be included in this total area.
C. 
Design Criteria.
1. 
General requirements. The design shall be accomplished under the direction of a registered professional engineer. The design shall also be based on land use in the tributary area as zoned, actually developed or indicated by an adopted future land use plan, whichever basis produces the greatest runoff.
2. 
Other references. Other agencies have criteria and regulations pertaining to drainage systems which may complement this criteria. When conflicts are encountered, the most rigorous criteria shall govern.
a. 
FEMA—Floodplain regulations and implementing ordinances adopted by municipalities. Drainage systems designed within the limits of the designated 100-year floodplain on the principal stream shall be designed to convey the flood as defined by applicable published floodplain information studies. For areas located in FIRM Zone "A" outside the detailed study, the developer shall prepare studies and calculations establishing the floodplain, elevation and width. These calculations shall be submitted to the reviewing agencies for approval.
b. 
Missouri Department of Natural Resources. Rules and regulations of the Dam and Reservoir Safety Council shall apply to those Missouri structures classified as dams thereunder.
3. 
Stormwater runoff. The design criteria used in determining the amount of runoff shall be the same as set out in Section 405.230 of this Chapter.
4. 
Hydraulic considerations for detention storage.
a. 
Principal spillways. Shall be designed to meet the following requirements:
(1) 
The principal spillway shall be designed to function without requiring attendance or operation of any kind or requiring use of equipment or tools.
(2) 
All discharge from the detention facility when inflow is equal to or less than the 100-year inflow shall be via the principal spillway(s).
(3) 
The design shall allow for discharge of at least eighty percent (80%) of the detention storage volume within twenty-four (24) hours after the peak or center of mass of the inflow has entered the detention basin. On basins less than one hundred (100) acres, this shall not apply.
(4) 
The design discharge rate via the spillway shall continuously increase with increasing head and shall have hydraulic characteristics similar to weirs, orifices or pipes.
b. 
Emergency spillways. The emergency spillway shall be provided to pass a 100-year storm without damaging any property and, where applicable, designed to DNR Dam Safety Requirements. Overland flow route will be required to be depicted on the plan for emergency spillways.
c. 
Outlet works. Detention facilities shall have an outlet works consisting of valves, gates, pipes and other devices as necessary to completely drain the facility in seventy-two (72) hours or less when required for maintenance or inspection on normally wet basins.
[Ord. No. 6207 § 16, 4-28-2016]
d. 
Sediment storage. Public detention facilities shall be designed to provide for five (5) years of sediment accumulation calculated by using Figure 1 in Appendix D. All other detention facilities shall provide storage for two (2) years of sediment accumulation by using Figure 1, except for those using roofs of buildings, paved parking areas or other facilities designed to preclude the deposition or accumulation of sediment. Sediment storage volume shall be in addition to the volume required for temporary storage of stormwater to properly size the detention facility on normally wet basins.
e. 
Erosion control. Principal spillways and outlet works shall be designed to prevent erosion and if necessary equipped with energy dissipating devices to slow the water to normal velocity as called out in Section 405.230(E)(4) of this Chapter. Special measures shall be taken by the developer to not permit sediment from filling the proposed detention basin during all construction of the proposed development unless a design is provided and approved to use the detention basin as a temporary silt basin until such time as the stormwater improvements are completed and the site vegetated.
f. 
Public detention facilities. As a general rule, detention facilities shall be private facilities. When determined that a facility shall be a public facility, the owner shall dedicate the detention facility and easements with the recording of the record plat, except:
[Ord. No. 6207 § 16, 4-28-2016]
(1) 
When multi-purpose wet facilities are planned or are suitable for use for private aquatic recreation or for aesthetic enhancement of the owner's property.
(2) 
When multi-purpose dry facilities incorporate surface recreational improvements.
(3) 
Any other means of dedication shall require acknowledgement and acceptance by ordinance from the City Council.
g. 
Private detention facilities. Shall be designed requiring the same criteria as the public detention facilities. The amount of easement shall be equal to the land occupied by the facility, plus a twenty (20) foot wide strip around the perimeter of the highest elevation attained by the design storage volume, plus an access easement twenty (20) feet in width between the facility and the public street. This easement shall be shown as common ground and be dedicated to the trustees of the subdivision or owner of the multi-family, commercial or industrial property for the purpose of maintenance of the storm water detention facility, and shall not be part of a residential lot. The easements as described above shall also be dedicated to the City for emergency access or periodic inspection. The following items shall be addressed:
[Ord. No. 6207 § 16, 4-28-2016]
(1) 
A plan for perpetual maintenance and designating responsibility for the maintenance shall be provided for its continuing performance to the standards established by these criteria.
(2) 
Underground detention facilities shall also have the above-mentioned easements provided. Easements shall be labeled properly on the record plat or by separate document.
h. 
Plan requirements. The plan requirements shall be the same as set out in Section 405.230 of this Chapter with the following additions:
[Ord. No. 6207 § 16, 4-28-2016]
(1) 
Elevation-area-capacity curves for the detention facility including notation of the storage volumes allocated to runoff and permanent residual water storage for other uses. (Wet basins only).
(2) 
Inflow hydrograph (detention volumes for rational method) for the two-, fifteen-, twenty-five- and one-hundred-year recurrence interval design storms.
(3) 
Stage-discharge rating curves for each spillway and for combined spillway discharges.
(4) 
Routing curves for the 2-year and all greater criteria recurrence interval design storms with time plotted as the abscissa and the following plotted as ordinates (this item is not required for the Rational Method):
(a) 
Cumulative inflow volume.
(b) 
Cumulative discharge.
(c) 
Stage elevation.
(5) 
A ten (10) foot minimum depth for all retention (wet detention) basins shall be required. (Per DNR recommendation for healthy aquatic environment.) This will be required until the five percent (5%) escrow release has been established.
(6) 
All storm sewer pipes shall be labeled as either 'Public' or 'Private' on the storm sewer profile sheets. The transition structure from public to private shall also be labeled accordingly. Pipes are not allowed to have said transition outside of a structure.
(7) 
For all underground detention facilities, a manhole (or similar accessible structure) shall be provided both upstream and downstream (within ten (10) feet or as approved by the City), for access. Access lids shall be labeled with the word 'underground basin' or similar on each structure. Labels shall be cast into the lid and be of the same material that is required under storm sewer design.
(8) 
No planting of trees or extensive landscaping shall be permitted over the top of the underground detention facility, within the limits of the encompassing easement.
D. 
Construction Alternates.
[Ord. No. 6207 § 16, 4-28-2016]
1. 
Developer shall build as part of his/her development a detention facility as required by this Section unless the following Subsections apply.
2. 
If requested by the developer or by the City of O'Fallon, the City at its option, may waive the construction of a detention facility as for the development. If the waiver is granted, the developer shall pay an amount equal to the cost of detention for the site as determined by the unit cost as published and updated by St. Louis County. This money is to be used in a storm water fund for future City storm water projects. A contractor's bid may be submitted in lieu of using the published data although the bid must be reviewed and approved by the City Engineer prior to acceptance. This option may only be considered if the requirements set out in Subsection (B) above are applicable.
3. 
Developers of adjacent tracts may combine to build one (1) detention site large enough to meet the requirements of all tracts of land with approval of the City. The basin shall be located in the same drainage basin.
4. 
On-site detention will be required whenever increased runoff from the proposed development creates a hazard downstream.
E. 
Inspection, Maintenance And Acceptance By The City Of O'Fallon.
[Ord. No. 6207 § 16, 4-28-2016]
1. 
The City Engineer shall inspect or cause to be inspected all storm water detention facilities constructed within the City of O'Fallon, Missouri. Through such inspections the City Engineer shall ensure that the facilities under construction are being constructed in accordance with the approved plans for such development.
2. 
Each owner of the property being developed or has been developed, whose property has caused the increase in runoff that has necessitated the need for detention, has the responsibility and duty to properly operate and maintain any storm water management system and/or detention facility, which has not been accepted for maintenance by the City. The responsibility of maintenance of the system and subdivision projects shall remain with the developer until such time as the storm water management system escrow for such development has been released and turned over to the Homeowner's Association or property owner(s) of record. If there is no active Homeowner's Association, all properties listed as part of the subdivision and/or development will become responsible for maintenance. This will include all underground detention facilities.
3. 
Maintenance responsibility shall remain with the property owner(s) whose said property or development necessitated the need for detention. Regardless of ownership of said basin, should the developer, owner(s), association, or other entity responsible for maintenance choose to sell, abandon, or otherwise vacate their interest or ownership of the basin, this will in no way eliminate their maintenance responsibility of said basin unless they have provided for perpetual future maintenance separately. Said maintenance plan as referenced in Subsection (C)(4)(g)(1) above shall be submitted to the City for approval.
4. 
All such privately owned maintained storm water systems and/or detention facilities shall be subject to periodic inspections by the City Engineer and/or his/her designee. After an inspection by the City Engineer and/or his/her designee, he/she determines whether or not the conditions of the privately owned storm water system and/or detention facilities are safe and operating and functioning per the approved plans.
a. 
For underground detention facilities, the owner(s) shall be required to submit an annual maintenance report to the City Engineer verifying its condition and that it is operating and functioning per the approved plans. Said inspection shall be performed by a competent professional who is experienced in this type of work.
5. 
If the privately-owned storm water systems and/or detention facility is found to be deficient and in need of compliance measures or maintenance, the property owner(s) will be notified and correction of such requested. Any corrections will be the responsibility as identified in Subsection (E)(3) above. Any cost incurred by the City, as a result of the City Engineer's actions, shall be assessed against the owner(s) of the system. Initially, the storm water funds as set up in Subsection (D)(2) above may be used to pay for any such emergency authorized by the City.
6. 
After notification is provided to the owner(s) of any deficiencies discovered from an inspection of a privately-owned storm water system and/or detention facility, the owner(s) shall have thirty (30) days or other time frame mutually agreed to between the City and the owner(s) to correct the deficiencies. The City shall then conduct a subsequent inspection to ensure completion of the repairs. If repairs are not undertaken or not found to be done properly, then enforcement procedures following this Section shall be followed.
7. 
If, after inspection by the City, the condition of a privately-owned storm water system and/or detention facility presents an immediate danger to the public health or safety, because of an unsafe condition or improper maintenance, the City shall take such action as may be necessary to protect the public and make the facility safe. Any cost incurred by the City, as a result of the City Engineer's actions, shall be assessed against the owner(s) of the system.
a. 
No modifications shall be made to any privately-owned storm water system and/or detention facility, without a permit or other approval from the City.
8. 
Native vegetation/natural basins. Should the owner(s) of a privately-owned storm water system and/or detention facility want to alter original construction to convert the system to provide increased water quality benefits and have a more natural appearance, such alternatives must be submitted by permit process to the City Engineer or his/her designee for review of detention facility functionality and approval.
a. 
Conversion examples include, but are not limited to; native grasses, wildflowers, removal of concrete swales, or alteration of outfall structures.
b. 
If approved, owner(s) shall prepare and submit a maintenance schedule for the conversion. Modifications will be subject to inspection during conversion and continue after acceptance.
c. 
If approved, converted areas shall be excluded from mowing requirements as stated in Section 220.100, Weeds, but an alternative mowing/maintenance schedule shall be submitted and followed.
(1) 
Annual mowing will be required in efforts to prevent the vegetation from becoming excessive and basins from getting overgrown. All conversion-permitted basins shall be mowed by November 1 of each year. Failure to meet this requirement will result in enforcement in accordance with Section 220.100.
d. 
Maintenance of such systems will continue to be the responsibility of the property owner(s) as stated in Subsections (E)(2-7).
e. 
Under no circumstances does the altercation from a detention facility to a native vegetation area waive the requirements for detention.
9. 
Upon acceptance of public detention facilities by the City Council, the storm water detention facility may be dedicated to the City for perpetual maintenance. Any such system shall include adequate perpetual access and sufficient area for maintenance by the City personnel and vehicles.

Section 405.245 Stormwater Quality Management and Illicit Discharge Control.

[Ord. No. 5271 §1, 1-14-2008; Ord. No. 5337 §1, 6-26-2008]
A. 
Purpose And Intent. The purpose of this Section is to provide for the health, safety and general welfare of the citizens of the City of O'Fallon through the regulation of non-stormwater discharges to the storm drainage system to the maximum extent practicable as required by Federal and State law. This Section establishes methods for controlling the introduction of pollutants into the Municipal Separate Storm Sewer System (MS4) in order to comply with requirements of the National Pollutant Discharge Elimination System (NPDES) permit process. The objectives of this Section are:
1. 
To regulate the contribution of pollutants to the Municipal Separate Storm Sewer System (MS4) by stormwater discharges by any user.
2. 
To prohibit illicit connections and illicit discharges to the Municipal Separate Storm Sewer System (MS4).
3. 
To establish legal authority to carry out all inspection, surveillance and monitoring procedures necessary to ensure compliance with this Section.
B. 
Applicability. This Section shall apply to all water entering the storm drain system generated on any developed and undeveloped lands unless explicitly exempted by an authorized enforcement agency.
C. 
Responsibility For Administration. The City of O'Fallon shall administer, implement and enforce the provisions of this Section. Any powers granted or duties imposed upon the City Administrator may be delegated by the City Administrator to persons or entities acting in the beneficial interest of or in the employ of the City.
D. 
Severability. The provisions of this Section are hereby declared to be severable. If any provision, clause, sentence or paragraph of this Section or the application thereof to any person, establishment or circumstances shall be held invalid, such invalidity shall not affect the other provisions or application of this Section.
E. 
Ultimate Responsibility. The standards set forth herein and promulgated pursuant to this Section are minimum standards; therefore this Section does not intend nor imply that compliance by any person will ensure that there will be no contamination, pollution nor unauthorized discharge of pollutants.
F. 
Discharge Prohibitions.
1. 
Prohibition of illegal discharges. No person shall discharge or cause to be discharged into the municipal storm drain system or watercourses any materials including, but not limited to, pollutants or waters containing any pollutants that cause or contribute to a violation of applicable water quality standards, other than stormwater.
The commencement, conduct or continuance of any illegal discharge to the storm drain system is prohibited except as described as follows:
a. 
The following discharges are exempt from discharge prohibitions established by this Section: water line flushing or other potable water sources, landscape irrigation or lawn watering, diverted stream flows, rising ground water, ground water infiltration to storm drains, uncontaminated pumped ground water, foundation or footing drains, sump pumps (not including active ground water dewatering systems), crawl space pumps, air conditioning condensation, springs, non-commercial washing of vehicles, natural riparian habitat or wetland flows, swimming pools (if dechlorinated—typically less than one (1) PPM chlorine), fire-fighting activities and any other water source not containing pollutants.
b. 
Discharges specified in writing by the authorized enforcement agency as being necessary to protect public health and safety.
c. 
Dye testing is an allowable discharge, but requires a verbal notification to the authorized enforcement agency prior to the time of the test.
d. 
The prohibition shall not apply to any non-stormwater discharge permitted under an NPDES permit, waiver or waste discharge order issued to the discharger and administered under the authority of the Federal Environmental Protection Agency, provided that the discharger is in full compliance with all requirements of the permit, waiver or Missouri Department of Natural Resources (MDNR) and other applicable laws and regulations and provided that written approval has been granted for any discharge to the storm drain system.
2. 
Prohibition of illicit connections.
a. 
The construction, use, maintenance or continued existence of illicit connections to the storm drain system is prohibited.
b. 
This prohibition expressly includes, without limitation, illicit connections made in the past, regardless of whether the connection was permissible under law or practices applicable or prevailing at the time of connection.
c. 
A person is considered to be in violation of this Section if the person connects a line conveying sewage to the MS4 or allows such a connection to continue.
G. 
Suspension Of MS4 Access.
1. 
Suspension due to illicit discharges in emergency situations. The City of O'Fallon may, with appropriate notice, suspend MS4 discharge access to a person in order to prevent an actual or threatened discharge which presents or may present imminent and substantial danger to the environment or to the health or welfare of persons or to the MS4 or waters of the United States. If the violator fails to comply with a suspension order issued in an emergency, the authorized enforcement agency may take such steps as deemed necessary to prevent or minimize damage to the MS4 or waters of the United States or to minimize danger to persons.
2. 
Suspension due to the detection of illicit discharge. Any discharge to the MS4 in violation of this Section may result in termination of MS4 access. If such termination would abate or reduce an illicit discharge, the City shall notify the violator of the proposed termination of its MS4 access. The violator may petition or request a hearing before the City Council, but must suspend the illicit discharge until after the reconsideration and hearing are held.
3. 
A person commits an offense if the person reinstates MS4 access to premises suspended or terminated pursuant to this Section without the prior approval of the authorized enforcement agency.
H. 
Industrial Or Construction Activity Discharges. Any person subject to an industrial or construction activity NPDES stormwater discharge permit shall comply with all provisions of such permit. Proof of compliance with said permit may be required in a form acceptable to the City of O'Fallon prior to the allowing of discharges to the MS4.
I. 
Monitoring Of Discharges.
1. 
Applicability. This Section applies to all facilities that have stormwater discharges associated with industrial activity, including construction activity.
2. 
Access to facilities and records.
a. 
Facility operators shall provide to the City of O'Fallon copies of records that must be kept under the conditions of an NPDES permit to discharge stormwater.
b. 
Upon consent of the property owner, the City of O'Fallon may install monitoring equipment as necessary. The facility's sampling and monitoring equipment shall be maintained at all times in a safe and proper operating condition by the discharger at its own expense; however, such equipment shall remain the property of the City of O'Fallon. All devices used to measure stormwater flow and quality shall be calibrated to ensure their accuracy. No person shall damage such equipment or alter such equipment so that proper results cannot be obtained.
c. 
If the City of O'Fallon has been refused access to any part of the premises from which stormwater is discharged or if the property owner is not available to give consent to access the premises, the City may, upon demonstrating probable cause to believe that there may be a violation of this Section or a need to inspect and/or sample to verify compliance with this Section or any order issued hereunder, seek issuance of an administrative search warrant from any court of competent jurisdiction.
J. 
Requirement To Prevent, Control And Reduce Stormwater Pollutants By The Use Of Best Management Practices (BMP's). The City of O'Fallon will adopt requirements identifying Best Management Practices (BMP's) for any activity, operation or facility which may cause or contribute to pollution or contamination of stormwater, the storm drain system or waters of the U.S. The owner or operator of a commercial or industrial establishment shall provide, at their own expense, reasonable protection from accidental discharge of prohibited materials or other wastes into the municipal storm drain system or watercourses through the use of these structural and non-structural BMP's. Further, any person responsible for a property or premises, which is or may be the source of an illicit discharge, will be required to implement, at said person's expense, additional structural and non-structural BMP's to prevent the further discharge of pollutants to the Municipal Separate Storm Sewer System (MS4). Compliance with all terms and conditions of a valid NPDES permit authorizing the discharge of stormwater associated with industrial activity, to the extent practicable, shall be deemed compliance with the provisions of this Section. These BMP's shall be part of a Storm Water Pollution Prevention Plan (SWPP) as necessary for compliance with requirements of the NPDES permit.
K. 
Watercourse Protection. Every person owning property through which a watercourse passes or such person's lessee shall keep and maintain that part of the watercourse within the property free of trash, debris, excessive vegetation and other obstacles that would pollute, contaminate or significantly retard the flow of water through the watercourse. In addition, the owner or lessee shall maintain existing privately owned structures within or adjacent to a watercourse so that such structures will not become a hazard to the use, function or physical integrity of the watercourse.
L. 
Notification Of Spills. Notwithstanding other requirements of law, as soon as any person responsible for a facility or operation or responsible for emergency response for a facility or operation has information of any known or suspected release of materials which are resulting or may result in illegal discharges or pollutants discharging into stormwater, the storm drain system or waters of the U.S., said person shall take all necessary steps to ensure the discovery, containment and cleanup of such release. In the event of such a release of hazardous materials, said person shall immediately notify emergency response agencies of the occurrence via emergency dispatch services. In the event of a release of non-hazardous materials, said person shall notify the City in person or by phone or facsimile no later than the next business day. Notifications in person or by phone shall be confirmed by written notice addressed and mailed to the City of O'Fallon within three (3) business days of the phone notice. If the discharge of prohibited materials emanates from a commercial or industrial establishment, the owner or operator of such establishment shall also retain an on-site written record of the discharge and the actions taken to prevent its recurrence. Such records shall be retained for at least three (3) years.
M. 
Enforcement.
1. 
Notice of violation. Whenever the City Administrator finds that a person has violated a prohibition or failed to meet a requirement of this Section, the City Administrator may order compliance by written notice of violation to the responsible person. Such notice and order may require without limitation:
a. 
The performance of monitoring, analyses and reporting;
b. 
The elimination of illicit connections or discharges;
c. 
That violating discharges, practices or operations shall cease and desist;
d. 
The abatement or remediation of stormwater pollution or contamination hazards and the restoration of any affected property; and
e. 
The implementation of source control or treatment BMP's.
The City Administrator may order that such work by completed within a reasonable time from the date of the notice of violation.
2. 
If the property owner fails to abate the violation and/or restore the affected property within the time prescribed following notice or appeal, the work may be done by the City or a contractor designated by the City Administrator and the expense in accordance with the City's procedures for abatement of a nuisance. The property owner shall be responsible for all costs of such work.
N. 
Appeal Of Notice Of Violation. Any person receiving a notice of violation may appeal the determination and order of the City Administrator. The notice of appeal must be received within thirty (30) days from the date of the notice of violation. Hearing on the appeal before the City Council or its designee shall take place within thirty (30) days from the date of receipt of the notice of appeal. Any aggrieved party shall then be entitled to judicial review in accordance with the provisions of the Missouri Administrative Procedures Act.
O. 
Injunctive And Other Relief. It shall be unlawful for any person to violate any provision or fail to comply with any of the requirements of this Section. If a person has violated or continues to violate the provisions of this Section, the authorized enforcement agency may petition for a preliminary or permanent injunction restraining the person from activities which would create further violations or compelling the person to perform abatement or remediation of the violation. In addition, the authorized enforcement agency may utilize any remedy, at law or in equity, in order to enforce the provisions of this Section. The City may recover all attorneys' fees, court costs and other expenses associated with enforcement of this Chapter, including sampling and monitoring expenses.
P. 
Violations Deemed A Public Nuisance. In addition to the enforcement processes and penalties provided, any condition caused or permitted to exist in violation of any of the provisions of this Section is a threat to public health, safety and welfare and is declared and deemed a nuisance and may be summarily abated or restored at the violator's expense and/or a civil action to abate, enjoin or otherwise compel the cessation of such nuisance may be taken.
Q. 
Prosecution For Violations. Any person that has violated or continues to violate this Section shall be liable to prosecution to the fullest extent of the law and, upon conviction, shall be subject to a fine in an amount not to exceed five hundred dollars ($500.00) per charge and/or imprisonment for a period of time not to exceed ninety (90) days per charge.
R. 
Remedies Not Exclusive. The remedies listed in this Section are not exclusive of any other remedies available under any applicable Federal, State or local law and it is within the discretion of the City to seek cumulative remedies.

Section 405.247 Stormwater Quality — Best Management Practices.

[Ord. No. 5271 §1, 1-14-2008; Ord. No. 5831 §15, 12-13-2012]
A. 
Purpose And Intent. Two consequences of construction and development are increased runoff created by the changed properties of ground surface and the rate of discharge of this increased runoff. These are both of great relevance to stormwater. The natural condition of the land before development is in relative balance with the natural capacity of the receiving creeks. Normally, the undeveloped conditions provide greater permeability and longer times of concentration. By modification of the ground surface from the irregular, pervious and vegetation-covered, the areas are changed to more impervious, more quickly drained and, in some cases, denuded of vegetation. It is the policy of the City to protect and promote the public health, safety and general welfare. The management of stormwater will reduce the erosion on land and creek channels, will reduce the possibility of damage to public and private property, and will assist in the attainment and maintenance of water quality standards, and will preserve the environmental quality of the watercourses in the City.
B. 
Requirements—Creekbank Setback. Development along natural watercourses shall have residential lot lines, commercial or industrial improvements, parking areas and driveways set back a minimum of twenty-five (25) feet from the top of the existing stream bank. This is not meant to prevent access across creeks. Except as otherwise provided herein or as allowed by the City, the section of land between a natural watercourse and lot lines shall be designated as common ground and drainage easement to be maintained by the trustees or owners' association of the subdivision within all types of developments. Only for non-residential subdivisions in lieu of the common ground requirement, the section of land between the natural watercourse and twenty-five (25) feet from the top of bank can be:
1. 
Private property with an easement dedicated to the trustees or owners' association requiring maintenance of the areas as the responsibility of the trustees or owners' association,
2. 
Private property subject to a conservation easement in favor of an organization or land trust dedicated to environmental protection or land preservation such as Trailnet, Inc., the Open Space Council for the St. Louis Region or similar organization,
3. 
Set aside in a stream bank mitigation program approved by the United States Army Corps of Engineers under the provisions of the Clean Water Act.
All developments shall maintain a setback minimum of fifty (50) feet from the top of the existing bank to any building structure requiring a construction permit that necessitates excavation or also requires a foundation. Commercial and industrial areas shall have creek areas dedicated as drainage easements. Notwithstanding the foregoing setback requirements, an applicant may obtain a variance to develop within the stream buffer area from the City, provided the applicant is able to demonstrate that the water quality and stream morphology will not be adversely affected or adequate mitigation is provided to offset such adverse effects. Mitigation may include, but not be limited to, the following:
1.
Installing additional erosion and sediment control;
2.
If the stream has the potential for lateral movement, installing stream stabilization practices within the stream;
3.
For those sites where vegetation does not exist, establishing vegetation; and/or
4.
Additional tree planting.
C. 
Post Construction—Water Quality. In order to preserve the quality of water in natural streams, it is important to provide a mechanism to remove contaminants on the site prior to water entering the natural watercourse. Typically called post construction BMP (Best Management Practices), these methods identify a critical water quality volume that will need to receive a treatment to remove certain contaminants. These improvements whether structural or non-structural will remain in place after the construction is completed. The concepts introduced in the following paragraphs are taken from the Georgia Stormwater Management Manual, Volume 2, August, 2001. Nothing in the following paragraphs shall change or replace any of the City's detention ordinances.
1. 
Water quality volume (WQv). The water quality volume (denoted as the WQv) is the storage needed to capture and treat the runoff from ninety percent (90%) of the recorded daily rainfall events. In numerical terms, it is equivalent to one and fourteen-hundredths (1.14) inches of rainfall multiplied by the volumetric runoff coefficient (Rv) and site area. The WQv is directly related to the amount of impervious cover created at a site. A minimum WQv of two-tenths (0.2) inches per acre shall be met at all sites.
Redevelopment projects can appeal to the Planning and Zoning Commission to reduce or eliminate WQv if it can be shown that there are stormwater enhancements being provided.
2. 
As a basis for determining water quality treatment volume, the following assumptions may be made:
a. 
The water quality volume WQv for off-site areas is not required. The following equations are used to determine the storage volume, WQv (in acre/feet of storage):
WQv
=
[(P)(Rv)(A)]/12
P
=
1.14 inches of rainfall
Where:
WQv
=
water quality volume (in acre-feet)
Rv
=
0.05 + 0.009 (I) where I is percent impervious cover
A
=
area in acres
b. 
Measuring impervious cover. The measured area of a site plan that does not have vegetative or permeable cover shall be considered total impervious cover.
c. 
Multiple drainage areas. When a project contains or is divided by multiple drainage areas, the WQv volume shall be addressed for each drainage area.
d. 
Off-site drainage areas. The WQv shall be based on the impervious cover of the proposed site. Off-site existing impervious areas may be excluded from the calculation of the water quality volume requirements.
e. 
BMP treatment. The final WQv shall be treated by an acceptable BMP(s) from the list presented in this Chapter.
f. 
Extended detention for water quality volume. The water quality requirements can be met by providing a twenty-four (24) hour draw down of a portion of the water quality volume (WQv) in conjunction with a stormwater pond or wetland system.
D. 
Acceptable Urban BMP Options. This Subsection sets forth five (5) acceptable groups of BMP that can be used to meet the water quality volume criteria (WQv). The design and selection of these BMP should comply with the Georgia Stormwater Management Manual as prepared by the State of Georgia.
Where the City's criteria or requirements are more stringent, then they shall govern. Adapting to local Missouri environment and natural conditions should be expected but shall be as approved by the City or a higher authority.
1. 
The acceptable BMP designs are assigned into five (5) general categories for stormwater quality control (WQv):
BMP Group 1 stormwater ponds
BMP Group 2 stormwater wetlands
BMP Group 3 infiltration practices
BMP Group 4 filtering practices
BMP Group 5 open channel practices
See Section 1.3 of the Georgia Stormwater Management Manual for additional BMP options. Section 3 of the Georgia manual has detailed descriptions of each control.
2. 
To be considered an effective BMP for stand-alone treatment of WQv, a design shall be capable of:
a. 
Capturing and treating the required water quality volume (WQv).
b. 
Removing eighty percent (80%) of the TSS.
3. 
A combination of BMPs and/or credits is normally required at most development sites to meet all three (3) stormwater sizing criteria.
a. 
BMP Group 1. Stormwater Ponds. Practices that have a combination of permanent pool, extended detention or shallow wetland equivalent to the entire WQvs include:
P-1 micropool extended detention pond
P-2 wet pond
P-3 wet extended detention pond
P-4 multiple pond system
P-5 pocket pond
b. 
BMP Group 2. Stormwater Wetlands. Practices that include significant shallow wetland areas to treat urban stormwater but often may also incorporate small permanent pools and/or extended detention storage to achieve the full WQv include (Modification of existing wetland areas will require a Corps 404 permit):
W-1 shallow wetland
W-2 ED shallow wetland
W-3 pond/wetland system
W-4 pocket wetland
Wetlands shall not be used for control of water quantity (i.e., the flood protection volume).
c. 
BMP Group 3. Infiltration Practices. Practices that capture and temporarily store the WQv before allowing it to infiltrate into the soil over a two (2) day period include:
I-1 infiltration trench
I-2 infiltration basin
Infiltration practices will be allowed on sites where it is proven that infiltration will work. Percolation rates shall be determined for proper use.
d. 
BMP Group 4. Filtering Practices. Practices that capture and temporarily store the WQv and pass it through a filter bed of sand, organic matter, soil or other media are considered to be filtering practices. Filtered runoff may be collected and returned to the conveyance system. Design variants include:
F-1 surface sand filter
F-2 underground sand filter
F-3 perimeter sand filter
F-4 organic filter
F-5 pocket sand filter
F-6 bioretention*
F-7 proprietary filtering system
*may also be used for infiltration
A maintenance agreement and maintenance schedule shall be required.
e. 
BMP Group 5. Open Channel Practices. Vegetated open channels that are explicitly designed to capture and treat the full WQv within the dry or wet cells formed by checkdams or other means include:
(1) 
dry swale
(2) 
wet swale
(3) 
filter strips
Open channel practices shall be designed with the proper plantings. Wet swales shall be designed to drain out over time.

Section 405.250 Sanitary Sewers.

[R.O. 2007 §405.250; Ord. No. 1499 §512.0, 8-17-1987; Ord. No. 1679 §1, 3-3-1989; Ord. No. 5337 §1, 6-26-2008]
A. 
All buildings, structures and uses of land in the incorporated area of the City of O'Fallon shall hereafter be required with an adequate, safe and sanitary disposal system for all human disposal of sewage or other liquidated wastes and shall conform to the methods outlined herein:
1. 
Where a public sanitary sewer main is reasonably accessible, in the opinion of the City, the developer shall provide the subdivision with a complete sanitary sewer system connected with such sewer main, including a lateral connection for each lot. Such systems and connections shall comply with the regulations of the Missouri State Board of Health and Missouri Department of Natural Resources, City of O'Fallon and the Duckett Creek Sewer District (where applicable).
2. 
It shall be the responsibility of the developer/applicant to comply with all requirements of the City of O'Fallon, MSD (2000)—Standard Construction Specifications for Sewers and Drainage Facilities and/or the most recently updated version and the Duckett Creek Sewer District (where applicable). Verification of the service shall be provided at the time of submission of the preliminary plat.
3. 
Where no sewers are accessible and no plans for a sewer system have been prepared and approved, the developer shall either install a sewage collection and disposal system in accordance with the requirements of Subsection (2) above or individual disposal devices may be installed on each lot within the subdivision, provided that no individual disposal device should be permitted unless the lots to be served have sufficient area to allow adequate soil absorption for on-site sewage disposal. The Planning and Zoning Commission may modify lot area requirements in relation to soil conditions and other pertinent facts and findings in any particular subdivision. All such individual devices and systems shall be constructed and maintained in accordance with the regulations and requirements of the Missouri Department of Natural Resources.
4. 
In no case shall there exist on lots of less than four (4) acres in area individual water systems and sanitary sewage disposal systems.

Section 405.260 Water Supply.

[R.O. 2007 §405.260; Ord. No. 1499 §513.0, 8-17-1987; Ord. No. 1679 §2, 3-3-1989; Ord. No. 5337 §1, 6-26-2008]
A. 
Where a public water supply main is reasonably accessible, in the opinion of the City, the subdivision shall be provided with a complete water distribution system adequate to serve the area being platted, including a connection for each lot and appropriately spaced fire hydrants whose locations shall be reviewed and approved by the appropriate fire protection district. The water system shall be designed and constructed per the "American Water Works Association" (A.W.W.A.) standards and guidelines and approved by the City of O'Fallon. Water systems outside the City of O'Fallon service area shall be reviewed and approved by the appropriate water district servicing the area. Approval letters shall be forwarded to the City of O'Fallon Engineering Department for service areas within the municipal boundaries.
B. 
In no case shall there exist on lots of less than four (4) acres in area individual water systems and sanitary sewage disposal systems.

Section 405.270 Gas, Wire or Cable Utilities.

[R.O. 2007 §405.270; Ord. No. 1499 §514.0, 8-17-1987; Ord. No. 4058 §1, 5-17-2000; Ord. No. 5337 §1, 6-26-2008]
A. 
All lines for gas, telephone, electrical, television and other services distributed by wire or cable shall be placed underground throughout a development. Overhead lines may be permitted by the Planning and Zoning Commission where it is determined that such lines will not impair the health, safety, general welfare, design, appearance and character of the subdivision and only where such overhead lines are brought to the perimeter of the subdivision. This Section shall not be construed to prohibit the construction of above ground or surface equipment associated with an underground distribution system, such as (but not limited to) surface-mounted transformers, power terminal pedestals, meters and meter boxes, concealed wires, street lights and street light poles.
B. 
Utility lines shall be installed prior to occupancy permits being issued on a particular phase. Utilities wishing to install utility lines after occupancy permits have been issued on a particular phase shall be required to obtain a permit from the City for their excavation.
C. 
The City strongly prefers simultaneous ditching whenever feasible.

Section 405.275 Terraced and Vertical Retaining Walls.

[Ord. No. 5337 §1, 6-26-2008]
A. 
A permit is required for all retaining walls that are over forty-eight (48) inches tall in height, measured from the top of the base to the top of the wall or for walls that support a surcharge load or that alters the channelized drainage of any lot or drainage area. For retaining walls requiring a permit, as-built plans are to be prepared by a certified licensed engineer when required by the Engineering Department.
B. 
Retaining walls shall not be placed any closer to another retaining wall as recommended by a geotechnical engineer or by a ratio of a minimum of two (2) feet horizontal for every one (1) foot of vertical height of wall.
C. 
Retaining walls in the front yard shall not exceed a height of four (4) feet and shall be set back a minimum of ten (10) feet from the front property line or outside the utility easement, whichever is greater. This requirement can be varied by the Planning and Zoning Commission or the Board of Adjustment.
D. 
Retaining walls in the side or rear yard shall not be built within two (2) feet from the property line. Retaining walls in side or rear yards over forty-eight (48) inches will not be allowed in public utility easements.
E. 
Retaining walls will not be allowed in public rights-of-way without written approval from the City Engineer.
F. 
A retaining wall may exceed four (4) feet in height if it has been designed and engineered by a licensed engineer, however, any wall shall not exceed six (6) feet in height without a fence or guard on top.
G. 
Any retaining wall more than thirty (30) inches tall which supports a walking surface that is within two (2) feet of the wall will require a guard on the retaining wall. The guard shall be constructed per the current edition of the International Building Code (IBC) or the International Residential Code (IRC), whichever is applicable.
H. 
Any resident who constructs a retaining wall within a public utility easement shall be financially responsible for the removal or reconstruction of the retaining wall, should the easement be needed, per Missouri law. Refer to the record plat of the subdivision for easement locations and sizes.
I. 
Any construction of a retaining wall requiring a permit shall include a drainage plan which provides for drainage around or away from the retaining wall and to be contained on site or drains to a City approved location. Stormwater will not be allowed to flow over the retaining wall.
J. 
Retaining walls that alter the channelized drainage of any lot or drainage area shall not be constructed without prior approval and permitting from the City of O'Fallon Engineering Department regardless of the height of the wall.
K. 
Any person who wishes to construct a retaining wall that requires engineering shall submit signed and sealed engineering plans and calculations for the retaining wall and a site plan showing the location of the retaining wall to the City of O'Fallon Building and Code Enforcement Division for review. Upon approval, a building permit will be issued.
[Ord. No. 6207 § 17, 4-28-2016]
L. 
For additional requirements see Chapter 500.

Section 405.280 through Section 405.290. (Reserved)

Section 405.300 Large Lot (One-Half Acre and Larger) Residential Subdivisions.

[R.O. 2007 §405.300; Ord. No. 1499 §517.0, 8-17-1987; Ord. No. 3708 §1, 6-17-1998; Ord. No. 5337 §1, 6-26-2008]
A. 
The following is a list of exemptions in this Chapter for large lot subdivisions; all other requirements of this Chapter must be met:
1. 
Cul-de-sacs and dead-end streets of reasonable length (normally not over eight hundred (800) feet) may be approved where necessitated by topography or where, in the opinion of the Planning and Zoning Commission, they are appropriate for the type of development contemplated.
a. 
Curb and gutter are not required; flat bottom open drainage ditches, approved by the City Engineer, shall be provided in lieu of curb and gutter.
b. 
Sidewalks are not required except in situations where deemed appropriate by the Planning and Zoning Commission and/or the City Council in order to provide direct access for pedestrians to recreational areas, common ground, schools, churches, shopping areas, pedestrian ways and multi-purpose trails linking adjoining streets and neighborhoods.
c. 
Street lights shall be required at all entrances and intersections and shall be provided at a maximum five hundred (500) foot separation.
[Ord. No. 6207 § 18, 4-28-2016]
B. 
If residents of a large lot subdivision desire to install any of the above improvements, such installation shall be solely at the expense of property owners of said subdivision. The City of O'Fallon has no responsibility or obligation to provide such improvement or to share in such provision. The developer of a large lot subdivision shall include language to this effect in recorded restrictions as a condition of record plat approval.

Section 405.310 Inspection.

[R.O. 2007 §405.310; Ord. No. 1499 §518.0, 8-17-1987; Ord. No. 5337 §1, 6-26-2008]
A. 
Prior to starting any of the work covered by the above plans and after approval thereof, the developer shall make arrangements to provide for inspection of the work, sufficient in the opinion of the City Engineer, to assure compliance with the plans and specifications as approved.
B. 
The City Engineer or their duly authorized representative shall make all necessary inspections of City infrastructure, escrow items or infrastructure located on the approved plans.
C. 
Twenty-four (24) hours' notice shall be given to the City Engineer's office regarding any requested inspection.

Section 405.320 Street Lights.

[R.O. 2007 §405.320; Ord. No. 1499 §519.0, 8-17-1987; Ord. No. 5337 §1, 6-26-2008; Ord. No. 5498 §1, 8-27-2009]
A. 
Street lights shall be provided in all subdivisions, except as stated under large lot residential subdivisions, Section 405.300. All street lights shall have underground wiring and meet minimum specifications of the electric utility company serving the area of the proposed subdivision. Street lights shall be placed at all intersections and in all cul-de-sacs. A maximum of three hundred (300) feet separation shall be required or in special cases a longer separation may be approved by the City Engineer. Street lights shall be installed prior to occupancy of structures within the subdivision.
B. 
New Street Light Installations.
1. 
In Ameren Missouri's territory, street lights shall be installed by developer in a manner that meets the specifications and rates for "Service Classification No. 6 (M) Street and Outdoor Area Lighting — Customer Owned" for unmetered service, nine thousand five hundred (9,500) lumens (HPS — high pressure sodium) or seventy-one (71) watt minimum (LED-Light Emitting Diode) — standard at the energy and maintenance rate. The upgrade to LED light shall be an upgrade paid for by the City, for the fixture cost only, at a maximum cost of three hundred dollars ($300.00) per fixture. The City Engineer shall prepare more specific details for this specification. After inspection and acceptance by the City, the lighting facilities will be maintained and operated by the City. With the developer incurring the full cost of the light installations and connections, street light billing in new subdivisions shall be turned over to the City for payment once lights are turned on. Connection fees will be paid to the City by the developer with the City being responsible for payment of the connection fee to the utility company when the lights are ready to be turned on. The City will provide written direction to the electric company to add new lights to the City's bill. During the period when an escrow for street lighting is in place, escrowed funds may be used for any maintenance expenses incurred or to be incurred by the City. The standard post top luminaries for the City shall be either the Early American style or the Colonial style. Alternate lighting styles may be selected if approved by the Planning and Zoning Commission.
[Ord. No. 6207 § 19, 4-28-2016]
a. 
As an alternative to City provided streetlights, the subdivision may opt to have private streetlights installed. Should this option be utilized, the private street lighting plan must be approved by the Planning and Zoning Commission. Also, the City Attorney and Department of Public Works must approve the language in the covenants and restrictions that provides for the perpetual payment of street lighting expenses by the Home Owner's Association, in a manner that ensures the lights will always be privately owned, and not revert to City-owned lights in the future. The specifications for the private lights as provided for in this paragraph shall be equal to or better than the City lighting standards.
2. 
In Cuivre River Electric Cooperative's territory, street lights must be similar in style and installation to the lights noted in Subsection (B)(1) and installed according to Cuivre River Electric Cooperative's requirements. Until a rate is established, for a City owned post top light, the installation will be a company owned light. When a new rate is established for City owned street lights similar to Ameren UE's customer owned rate, street light installations shall be made in a manner that closely follows Subsection (B)(l) above. The City Engineer shall prepare more specific details for this specification.
C. 
This Section pertains to lights on City streets only which are designed to be dedicated to the City for public use. Lighting on private streets and other areas will not be paid for by the City and, therefore, this Section is not applicable to those installations

Section 405.330 through Section 405.360. (Reserved)

Section 405.370 General Street Design Standards.

[R.O. 2007 §405.370; Ord. No. 1499 Exhibit A, 8-17-1987; Ord. No. 3708 §2, 6-17-1998; Ord. No. 4591 §2, 11-18-2003; Ord. No. 4680 §2, 6-28-2004; Ord. No. 4875 §6, 8-1-2005; Ord. No. 5323 §1, 5-8-2008]
A. 
The design of streets shall be designed in accordance with the principals established by the American Association of State Highway and Transportation Officials (AASHTO) and the Manual of Uniform Traffic Control Devices (MUTCD) except as modified by the City of O'Fallon. Designs shall also incorporate the Traffic Management Policy as adopted by the City of O'Fallon. All streets shall be constructed to St. Charles County Highway Specifications except as modified by the City of O'Fallon.
B. 
Minimum design requirements shall be as detailed in the table below.
[Ord. No. 6207 § 20, 4-28-2016]
ROW Width
Pavement Width
Lane Width
No. of Drive Lanes
Utility Easement
Design Speed
Minor Arterial
84
60
12
5
10
40
Collector
60
39
12
3
10
35
Residential Collector
56
32**
n/a
2
10
25
Minor Residential/ Local Access
50
26
n/a
2
10
25*
Notes:
*
=
Can be varied with City Engineer's approval. Minimum posted speed shall be twenty-five (25) miles per hour.
**
=
Detail to match minor residential street with wider pavement
These requirements may be varied by other City ordinances
Narrower pavement widths can be approved following Paragraph (D) of this Section
Parkway options can be provided as indicated in examples below
C. 
Typical pavement sections shall be as detailed below.
MINOR ARTERIAL
405-370C Dia 1.tif
MINOR ARTERIAL WITH PARKWAY OPTION
405-370C Dia 2.tif
COLLECTOR
405-370C Dia 3.tif
COLLECTOR WITH PARKWAY OPTION
405-370C Dia 4.tif
MINOR RESIDENTIAL/LOCAL ACCESS
405-370C Dia 5.tif
MINOR RESIDENTIAL/LOCAL ACCESS
LARGE LOT SUBDIVISIONS
405-370C Dia 6.tif
D. 
The above standards are to be considered minimum standards. Variations in the above standards can be made if supported by the Director of Planning and City Engineer and further approved by the Planning and Zoning Commission. Changes must provide for the health, safety and welfare of the community.
1. 
Reduced pavement widths shall be considered along with a package of enhanced landscaping, enhanced pedestrian facilities and other community improvements. A traffic study that includes a parking analysis will be required for projects requesting reduced pavement widths. The City's Planning Department will maintain a list of cross-sections along with the circumstances that make the reduced width cross-section suitable for the situation.
E. 
Center medians can be utilized where left turn lanes are not required.

Section 405.380 Guide For Determining Widths and Type of New Roadways.

[R.O. 2007 §405.380; Ord. No. 1499 Exhibit A, 8-17-1987; Ord. No. 4875 §7, 8-1-2005; Ord. No. 5323 §1, 5-8-2008]
A. 
When the traffic generated reaches a point that it cannot adequately be handled by a minor street, the following general guidelines will be used in determining the street classification for handling the traffic:
Type
Approximate Average Daily Traffic
(Ultimate Development)
Residential collector
1,000*
Collector
2,500
Arterial
7,500
Highways and thoroughfares
20,000 and up
B. 
The ADT's (average daily traffic) are approximate and the above criteria is intended as a general guideline only. The actual need and widths of collector or arterial type roads will be investigated for each development. Traffic volumes for residential and multi-family developments will generally be based on the number of trips generated per unit. A detailed traffic generation report will normally be required for commercial and industrial developments.
C. 
The need for and location of collector and arterial streets will be determined on the basis of traffic generated by the surrounding developments as well as the development itself. Consideration will also be given to the spacing and continuity of collector and arterial streets. New roadways will be required in accordance with the Comprehensive Plan.
D. 
Residential Collector Design Guidelines. Residential collector design shall be carefully designed with the following guidelines:
1. 
Residential collector designs with a projected ADT from one thousand (1,000) vehicles per day to one thousand five hundred (1,500) vehicles per day shall minimize the number of driveway connections on the road.
2. 
Residential collector designs with a projected ADT in excess of one thousand five hundred (1,500) vehicles per day shall not have driveway connections allowed.

Section 405.390 Required Subdivision Design and Improvement Standards — Street Standards.

[R.O. 2007 §405.390; Ord. No. 1499 Exhibit A, 8-17-1987; Ord. No. 4591 §3, 11-18-2003; Ord. No. 4680 §3, 6-28-2004; Ord. No. 4872 §4, 7-20-2005; Ord. No. 4875 §8, 8-1-2005; Ord. No. 5323 §1, 5-8-2008; Ord. No. 5831 §16, 12-13-2012; Ord. No. 5883 §11, 5-24-2013]
A. 
General Standards.
1. 
Street design shall attempt to preserve existing topography as nearly as possible. Streets shall intersect, as nearly as possible, at right angles. Street jogs with centerline offsets of less than one hundred twenty-five (125) feet are prohibited.
2. 
Streets will not be approved which are subject to flooding or frequent inundation.
3. 
The system of streets designated for the subdivision, except in unusual cases, must connect with any streets already dedicated in adjacent subdivisions; and where no adjacent connections are platted, must in general be the reasonable projection of streets into adjacent tracts and must, except in unusual cases, continue to the boundaries of the tract subdivided, so that other subdivisions may connect therewith.
4. 
The City Engineer may require a street to be dedicated to public use in order to provide circulation.
5. 
Underdrains shall be required and installed per Exhibit A in Appendix D.
B. 
The following standards shall apply to all streets:
Max. Grade
Min. Grade
Radius of Curve (Center)
Corner Radii
Arterial
5%
2%*
400
50
Collector
8%
2%*
350
50
Residential Collector
10%
2%*
200
37
Minor Residential
10%
2%*
150*
37
Cul-de-sac
10%
2%*
150*
37
Notes:
*
=
Can be varied with City Engineer's approval
-
These standards are minimum standards
C. 
Cul-de-sac And Stub Streets (Dead-End Streets To Be Extended In The Future).
1. 
In subdivisions with no through streets where the distance to the through street exceeds one thousand three hundred (1,300) feet, a fifty-five (55) foot pavement radius and a sixty-seven (67) foot right-of-way radius will be required on at least one (1) cul-de-sac in order to facilitate school bus circulation.
2. 
Cul-de-sacs and dead-end streets of reasonable length may be approved where necessitated by topography or where, in the opinion of the Planning and Zoning Commission, they are appropriate for the type of development contemplated.
3. 
All cul-de-sacs shall have a minimum right-of-way radius of fifty-two (52) feet or fifty-four (54) feet if sidewalks are provided and a pavement radius of forty-two (42) feet.
4. 
Stub streets over two hundred fifty (250) feet in length shall have a minimum temporary turnaround pavement radius of forty (40) feet, covered by a temporary turnaround easement to remain until the road is extended and platted. In lieu of turnarounds, the Planning and Zoning Commission may approve a "T" or "Y" shaped paved space on streets which are less than two hundred fifty (250) feet in length and are planned to be extended in the future.
5. 
All stub streets must provide three (3) standard specification, "Manual on Uniform Traffic Control Devices"*, end of roadway markers mounted on two (2) pound "U" channel sign posts. Each marker shall consist of an eighteen (18) inch diamond reflectorized red panel. The bottom of each panel shall be mounted a minimum of four (4) feet above the elevation of the permanent surface and installed at the terminus of pavement.
D. 
Alleys. Alleys, when platted, shall be designated as private. The width, depth and type of pavement shall meet the intended use. The minimum pavement width shall be sixteen (16) feet. Reduced pavement widths can be considered with the same requirements as contained in Section 405.370 for roadways. At a minimum, the pavement shall be six (6) inches of Portland cement concrete. The minimum horizontal radius shall be forty (40) feet at the centerline of the alley. The intersection of the alley pavement with the public pavement shall have a minimum thirty-seven (37) foot radius at the edge of the alley pavement. Alleys shall:
1. 
Be designated and signed for "one-way" traffic,
2. 
Have a minimum five (5) foot wide easement strip placed adjacent to the right side of the alley easement designated for street maintenance and trash receptacle placement,
3. 
Be designated and signed to prohibit on-street parking, and
4. 
Be designated and signed as "private streets" in accordance with Section 400.264 of this Code.
E. 
Commercial/Industrial Streets. Commercial/industrial streets shall have the following design standards.
1. 
Commercial and industrial streets including cul-de-sacs shall have a minimum right-of-way width of sixty (60) feet with thirty-nine (39) feet of pavement. The pavement in cul-de-sacs shall be fifty-five (55) feet in radius with a right-of-way of sixty-seven (67) feet wide radius.
2. 
Commercial and industrial arterial streets shall have a minimum right-of-way of eighty-four (84) feet.
3. 
Sidewalks are required on both sides of commercial streets. Industrial streets may have a sidewalk on one (1) side of the street if required by the Planning and Zoning Commission.
F. 
Sidewalks And Multi-Purpose Trails.
1. 
Sidewalks are required on both sides of all public and private streets except for:
a. 
Single-family residential subdivisions with an average lot size between one half (½) acre and one (1) acre shall have sidewalks installed on one (1) side of the street.
b. 
Single-family residential subdivisions with a minimum lot size one (1) acre or larger shall not have sidewalks required.
c. 
Private alleys shall not have sidewalks required.
d. 
A sidewalk is not required on the side of the street where a multi-purpose trail is required in lieu of a sidewalk.
e. 
Cul-de-sac streets shall have sidewalks installed on both sides of the street with the sidewalk terminating at the radius of the turnaround.
2. 
Sidewalks may be required by the Planning and Zoning Commission and/or the City Council on one (1) or both sides of the streets exempted above in order to provide direct access for pedestrians to recreational areas, common ground, schools, churches, shopping areas, pedestrian ways and multi-purpose trails linking adjoining streets and neighborhoods. The Planning and Zoning Commission and/or the City Council may limit the requirement of sidewalks to one (1) side of the street in commercial, office and high-tech developments that are deemed to likely experience lesser amounts of pedestrian traffic.
3. 
Sidewalks shall have a minimum pavement width of six (6) feet for arterial and of five (5) feet for collector streets and four (4) feet for all other streets and shall have a lateral slope of one-fourth (¼) inch per foot of width. Sidewalks shall be placed within the street right-of-way, one (1) foot away from the property line. Sidewalks shall be constructed of a minimum of four (4) inches of Portland cement concrete on a compacted rock leveling course with an average thickness of two (2) inches, except in driveways where it shall be a minimum of six (6) inches of Portland cement concrete on a compacted rock base with a minimum thickness of four (4) inches. Driveway aprons shall not break the sidewalk level. Accessible curb ramps shall be installed at all street intersections according to Federal regulations.
4. 
Multi-purpose trails. Multi-purpose trails shall be required in lieu of sidewalks where deemed appropriate according to the bike and trail plans approved by the Planning and Zoning Commission and/or the City Council. Multi-purpose trails shall have a minimum pavement width of ten (10) feet and shall be constructed of a minimum of three (3) inches of asphaltic concrete on a compacted rock base with a minimum thickness of four (4) inches. Concrete may be used in lieu of asphalt for construction of trails, and shall adhere to the design requirements of Subsection (F)(3) above. Multi-purpose trails shall be placed within a minimum twelve (12) foot wide trail easement. Accessible curb ramps shall be installed at all street intersections according to Federal regulations. In residential areas, wider than normal sidewalks or paths may be utilized as a developer or builder selected optional enhancement for the community, but these sidewalks or paths will not be considered multi-purpose trails unless they are ten (10) feet wide.
[Ord. No. 6207 § 21, 4-28-2016]
5. 
Required fee in lieu of sidewalk or multi-purpose trail installation. If it is determined by the City Engineer that it would be in the best interest of the City to postpone the installation of sidewalks and/or multi-purpose trails, the adjacent property owner shall be required to make a cash contribution to the City (or other applicable government agency) in lieu of the sidewalk and/or multi-purpose trail installation. Said fee shall be calculated as a fixed amount per lineal foot based on the estimated cost as of the date that escrows are established. Typically, this estimate shall be made by the owner's agent and submitted to the City for review and approval. At a time to be determined by the City, the City will be required to install sidewalks and/or multi-purpose trails on this property. Once the sidewalk or multi-purpose trail fee is paid for on a particular property, this lot shall no longer be required to provide a sidewalk or multi-purpose trail. The fees collected herein shall be recorded as revenue in the City's Street and Road Improvement Fund.

Section 405.400 through Section 405.490. (Reserved)