[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 03-142 §1(120), 10-1-2003; Ord. No. 07-040 §1, 3-13-2007]
A. 
The following standards are regarded as guidelines for desirable development. The size, shape, and orientation of lots shall be designed to provide desirable building sites and logically related to topography, natural features, streets, and adjacent land uses. Due regard shall be given to natural features such as large trees, unusual rock formations, watercourses, and sites which have historical significance, scenic views, and similar assets, the preservation of which would add attractiveness and value to the subdivision. The following minimum standards are set forth as guides to these goals:
1. 
Exhibit A summarizes the design standards and improvements to be observed in subdivision development.
2. 
Where additional widening strips are dedicated on existing streets, calculations of the area of a lot shall not include the dedicated strips in determining the gross area of the lot. Dedicated rights-of-way may be required for proposed subdivisions that abut County roads, arterial and collector streets as depicted on the thoroughfare plan or roads maintained by the Missouri Department of Transportation (MoDOT). Additional right-of-way, in excess of the standard dedication for widening strips, may be required when the subdivision is located on the inside of a curved roadway or when conditions exist on the opposite side of the right-of-way that dictate right-of-way offset from the right-of-way centerline. When the subdivision is located on only one (1) side of an existing street or County road, one-half (½) of the required right-of-way width shall be provided, measured from the centerline of the right-of-way, unless otherwise directed by the County Engineer. The centerline must meet the requirements of the St. Charles County Highway Department with regard to radius when located on a curved roadway. The area of all lots must be calculated exclusive of the street rights-of-way.
3. 
Where there is a question as to the suitability of a lot or lots for their intended use due to factors such as rock formations, soil conditions, steepness of terrain, flood conditions, or other adverse natural physical conditions, the Commission may, after adequate investigation, withhold approval of such plats unless engineering studies are presented to the Commission which establish that the method proposed to meet any such condition is adequate to avoid significant danger to public health, life, or public or private property.
4. 
Driveway grades shall not exceed a fifteen percent (15%) grade.
[Ord. No. 99-99 §1, 7-12-1999]
A. 
Blocks shall be designed so as to provide good circulation of traffic:
1. 
Lengths. Refer to Exhibit A.[1]
[1]
Editor's Note–Exhibit A is included as an attachment to this chapter.
2. 
Width. Blocks shall be wide enough to allow two (2) tiers of lots with sufficient depth to provide an adequate building site on each lot, except as consistent with street design standards as set forth. All lots within a subdivided plat must have driveway access to interior subdivision streets.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 03-142 §1(121), 10-1-2003]
A. 
The sizes, shapes, orientations, and dimensions of lots shall be appropriate for the location and physical character of the proposed subdivision and for the type of development proposed, in compliance with the applicable provisions of this Chapter and Chapter 405. Front setback lines shall be shown on all lots intended for residential use, and shall not be less than the setback required by the provisions of this Chapter and Chapter 405.
1. 
Depth. Excessive depth in relation to width shall be avoided (a proportion of 1:1 or 2:1 will normally be considered appropriate, unless topography is such that other lot dimensions allow for proper development).
2. 
Street access. Each proposed lot shall front upon a street improved to the St. Charles County Public Standard Specifications, unless the lots front on a private roadway, or existing or proposed State maintained highway.
3. 
Width. Lots for residential purposes shall have sufficient width at the front setback lines to permit compliance with front yard, side yard, or distance requirements of the Unified Development Ordinance and still be adequate for a building of practicable width. The minimum lot width required for a lot fronting on a curved right-of-way shall be measured along a line tangent to the front setback line at a point midway between the side lot property lines.
4. 
Side lot lines. Side lot lines shall be at right angles to straight streets and radial to curved streets, except when said radial lot lines detract from desirability of the lot, in which event some deviation may be allowed.
5. 
Corner lots. Corner lots for residential use shall be platted to permit compliance with the yard and setback requirements of the Unified Development Ordinance. The right-of-way radius on corner lots shall be a minimum of twenty-four (24) feet, or, in the case of a straight line, the line connecting two (2) points at a twenty-four (24) foot distance from the intersection of the projected lot lines.
[Ord. No. 99-99 §1, 7-12-1999]
A. 
In addition to the standards of this regulation, which are appropriate to the platting of all subdivisions, the subdivider shall demonstrate to the satisfaction of the Commission that the street, parcel, and block pattern proposed is specifically adapted to the uses anticipated. The following standards shall, therefore, be observed:
1. 
Proposed industrial parcels shall be suitable in area and dimensions to the types of industrial development anticipated.
2. 
Street right-of-way and pavement shall be adequate to accommodate the type and volume of traffic anticipated.
3. 
Block length. Refer to Exhibit A.[1]
[1]
Editor's Note–Exhibit A is included as an attachment to this chapter.
4. 
Every effort shall be made to protect adjacent residential areas from the proposed non-residential subdivision, including the provision of extra depth in parcels adjacent to an existing or potential residential development, and provision for a permanently landscaped buffer strip or privacy fence where approved by the Planning and Zoning Commission.
5. 
Streets carrying non-residential traffic, especially truck traffic, shall not be extended to the boundaries of adjacent residential areas, and shall not be connected to streets intended for predominantly residential traffic.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 03-142 §1(122—124), 10-1-2003]
A. 
Streets shall conform to existing topography as nearly as possible. Streets shall intersect, as nearly as possible, at right angles, and shall be between seventy degrees (70°) and ninety degrees (90°).
B. 
Streets will not be approved which are subject to flooding or frequent inundation.
C. 
Minor street intersection jogs or discontinuities with centerline offsets of less than one hundred (100) feet are prohibited.
D. 
All interior residential streets intersecting on minor and collector streets shall be directly opposite existing or other proposed streets or be a minimum of one hundred fifty (150) feet distant, as measured between street centerlines. Any collector road must have adequate stacking distance to provide for safe traffic movement. All other streets intersecting on arterial or non-residential streets shall be directly opposite existing or other proposed streets or shall be a minimum of three hundred (300) feet distant, as measured between street centerlines.
E. 
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 street connections are platted, must in general be the reasonable projection of streets in adjacent tracts, and must continue to the boundaries of the tract subdivided, so that other subdivisions may connect therewith.
F. 
Reserved strips of land retained by the subdivision developer that control or limit access at the terminus of streets or that prevent access to streets located adjacent to undeveloped land are prohibited.
G. 
Where a street stub has been required of the subdivision development, the developer shall, upon completion of the pavement construction, install a street extension sign at the roadway terminus which reads "THIS STREET WILL LIKELY BE EXTENDED AS PART OF FUTURE DEVELOPMENT". Refer to St. Charles County Design Criteria for the Preparation of Improvement Plans Standard Drawing C612.11, as issued by the St. Charles County Highway Department in February, 2002, or as amended thereafter, for location details.
H. 
The County Engineer or Director of the Division of Development Review may require traffic studies which he/she deems necessary and may require a street to be dedicated to public use and built to public street standards in order to provide circulation.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-054 §1, 4-25-2001; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 02-004 §11, 1-30-2002; Ord. No. 03-142 §1(125—126), 10-1-2003; Ord. No. 04-053 §1, 4-13-2004; Ord. No. 05-029 §1, 3-29-2005; Ord. No. 07-040 §1, 3-13-2007]
A. 
Arterial Streets. Arterial streets, as designated in the current thoroughfare plan as approved by the Governing Body, Exhibit A, or modifications or updates thereto, shall have widths as specified but not less than sixty (60) feet.
B. 
Collector Streets.
1. 
Major collector streets. Fifty-four (54) feet (see Exhibit A).[1]
[1]
Editor's Note–Exhibit A is included as an attachment to this chapter.
2. 
Minor collector streets. Forty-eight (48) feet (see Exhibit A).
C. 
Minor, Minor Stub And Cul-de-Sac Streets. Forty-two (42) feet. All cul-de-sac streets shall have a minimum turnaround pavement radius of forty (40) feet and a minimum right-of-way radius of forty-eight (48) feet. In subdivisions with no through streets, a fifty-five (55) foot pavement radius and a sixty-three (63) foot right-of-way radius will be required on at least one (1) cul-de-sac. For subdivisions in which the only street is a cul-de-sac, the fifty-five (55) foot pavement radius and sixty-three (63) foot right-of-way radius shall only be required if the cul-de-sac exceeds one thousand three hundred (1,300) feet in length. For public streets, an island with a twenty-nine (29) foot radius common ground is recommended in the fifty-five (55) foot radius cul-de-sac. Turnarounds shall not be required on stub streets which are less than two hundred fifty (250) feet in length and are planned to be extended in the future, but will require hazard markers consisting of three (3) standard specification end-of-roadway markers, as set forth in the current "Manual on Uniform Traffic Control Devices" (M.U.T.C.D.), at terminus of pavement. All stub streets in excess of two hundred fifty (250) feet in length must provide a temporary turnaround with hazard markers consisting of three (3) standard specification end-of-roadway markers, as set forth in the M.U.T.C.D., being installed at terminus of pavement. Temporary turnarounds shall have a minimum pavement radius of forty (40) feet centered within a forty-three (43) foot radius easement. Permits will not be issued for building construction on lots abutting a temporary turnaround, as shown on any recorded subdivision plat, unless and until the temporary facility is actually constructed and approved by the County Engineer. The removal of the temporary turnaround and the restoration of the disturbed ground shall be the responsibility of the party that will be extending the street. Refer to Exhibit A for general street standards.[2]
[2]
Editor's Note–Exhibit A is included as an attachment to this chapter.
D. 
Utility Easements. Any dedications or grants of utility easements must be entirely outside any areas dedicated as right-of-way to the public. 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 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.
[Ord. No. 14-046 §3, 5-27-2014]
E. 
Storm Sewer Easements. Storm sewers and storm sewer structures shall be located within the right-of-way or dedicated storm sewer easements. Storm sewer easements shall be outside of utility easements, but storm sewer easements and utility easements may overlap for crossings not to exceed twenty (20) feet in width. Storm sewer 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 channels, where required.
[Ord. No. 14-046[3] §3, 5-27-2014]
[3]
Editor’s Note: This ordinance also amended the title of Section 410.320.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 03-142 §1(127), 10-1-2003]
A. 
Arterial Streets. Require a traffic study.
B. 
Collector Streets.
1. 
Major collector streets. Thirty-eight (38) feet (see Exhibit A).[2]
[2]
Editor's Note–Exhibit A is included as an attachment to this chapter.
2. 
Minor collector streets. Thirty-two (32) feet (see Exhibit A).[3]
[3]
Editor's Note–Exhibit A is included as an attachment to this chapter.
C. 
Minor, Minor Stub And Cul-de-Sac Streets. Twenty (20) to twenty-six (26) feet (refer to Exhibit A)[4]. The pavement of a turning circle at the end of a cul-de-sac street shall have a minimum radius of forty (40) feet. A T- or Y-shaped paved space for a temporary turnaround only must be approved by the County Engineer and will be considered only if an extreme hardship can be demonstrated.
[Ord. No. 20-031, 3-30-2020]
[4]
Editor's Note–Exhibit A is included as an attachment to this chapter.
D. 
Sidewalks. Sidewalks shall be installed on both sides of all arterial streets, on one (1) side of collector streets and certain public minor streets. The only public minor streets which will not require a sidewalk are cul-de-sac streets. Sidewalks shall be constructed of four (4) inch thick concrete, except across driveways and temporary turnarounds where the thickness shall be increased to match the driveway approach or adjacent pavement thickness, and have a minimum width of four (4) feet in residential areas. In commercial and industrial areas, sidewalks shall be required as deemed appropriate by the Director of the Division of Planning and Zoning and the Governing Body and shall have a minimum width of five (5) feet. Maintenance of the sidewalk shall be the responsibility of the adjoining property and this requirement will be indicated on the final plat and subdivision restrictions. Handicap access ramps meeting Americans with Disabilities Act Accessibility Guidelines shall be required at intersections. Sidewalks shall have a transverse slope of two percent (2%) and shall be located within and one (1) foot off the right-of-way line, wherever possible. Sidewalks required along streets with no curb and gutter shall be located outside and within one (1) foot of the right-of-way line, wherever possible, and within a dedicated easement.
E. 
Street Lighting. Street lights may be installed by the developer. Lighting shall be designed and maintained to avoid unnecessary illumination of residential interiors. The developer shall submit to the Division of Planning and Zoning a maintenance agreement, subdivision restrictions, or other similar instrument setting forth the person, corporation, trustees, or other agency responsible for the assessment as well as the collection of monies necessary for the operation of the lighting system within the subdivision.
[1]
Editor's Note—For designation of the division of planning and zoning, see ord. no. 02-204 adopted 12-23-2002 set out in ch. 132 of this code and ord. no. 03-195 adopted 12-31-2003.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 03-142 §1(128), 10-1-2003]
Streets shall be designed in accordance to Section 40.20 of St. Charles County's "Design Criteria for the Preparation of Improvement Plans" as issued by the St. Charles County Highway Department in February, 2002, or as amended thereafter.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-192 §1, 12-27-2001; Ord. No. 03-142 §1(129), 10-1-2003; Ord. No. 10-041 §62, 6-2-2010; Ord. No. 20-031, 3-30-2020]
A. 
Longitudinal grades and curved alignments proposed for all streets shall meet the requirements of Sections 20.10—20.50 of St. Charles County's "Design Criteria for the Preparation of Improvement Plans" as issued by the St. Charles County Highway Department in February, 2002, or as amended thereafter. Streets approved with no curb and gutter shall have a minimum grade of one percent (1%).
B. 
Private Service Drives And Alleys. Longitudinal street grades shall be two percent (2%) minimum, twelve percent (12%) maximum. Service drives and alleys with no curb and gutter shall have a minimum grade of one percent (1%).
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-054 §1, 4-25-2001; Ord. No. 03-142 §1(130), 10-1-2003; Ord. No. 05-029 §1, 3-29-2005; Ord. No. 07-040 §1, 3-13-2007]
A. 
Street name signs meeting the requirements of the M.U.T.C.D. shall be erected by the subdivider at all intersections prior to final occupancy being given to any residential structure.
B. 
A speed limit sign, meeting the requirements of the M.U.T.C.D., shall be erected by the subdivider at all entrances to the subdivision. The speed limit signs shall display a posted speed limit of twenty-five (25) miles per hour, unless directed otherwise by the County Engineer and shall be installed along the inbound lane of the subdivision within one hundred (100) to one hundred fifty (150) feet of the subdivision entrance. Other traffic regulation signage, to include, but not limited to, stop signs, as determined by the County Engineer, shall be depicted on improvement plans and shall be erected by the subdivider. All required signage shall meet M.U.T.C.D. requirements.
C. 
When 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.
D. 
To provide for public safety and welfare and to avoid duplication, the proposed names of subdivisions shall be approved by the Division of Planning and Zoning and all street names shall be approved by the St. Charles County Dispatch and Alarm Department prior to both preliminary plat approval and such names being assigned.
[1]
Editor's Note—For designation of the division of planning and zoning, see ord. no. 02-204 adopted 12-23-2002 set out in ch. 132 of this code and ord. no. 03-195 adopted 12-31-2003.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-054 §1, 4-25-2001; Ord. No. 03-142 §1(131), 10-1-2003; Ord. No. 17-107 § 1, 11-27-2017; Ord. No. 20-031, 3-30-2020]
A. 
Streets shall be graded to the full width of the right-of-way and the pavement fully constructed of the following materials and thicknesses:
1. 
Public Streets. All public streets shall meet the minimum paving standards required in Sections 20.10—20.40 of St. Charles County's "Design Criteria for the Preparation of Improvement Plans" as issued by the St. Charles County Highway Department in February, 2002, or as amended thereafter.
a. 
Collector Streets.
(1) 
Nine and one-half (9 1/2) inches of asphaltic concrete on a four (4) inch thick compacted aggregate base.
(2) 
Seven (7) inches of Portland cement concrete on a four-inch-thick compacted aggregate base.
b. 
Minor Streets.
(1) 
Seven and one-half (7 1/2) inches of asphaltic concrete on a four-inch-thick compacted aggregate base.
(2) 
Six (6) inches of Portland cement concrete on a four-inch-thick compacted aggregate base.
c. 
Temporary Pavements.
(1) 
Seven (7) inches of Type "X" asphaltic concrete on properly compacted subgrade; or
(2) 
Four (4) inches of Type "C" asphaltic concrete on seven (7) inches of compacted, rolled stone base.
B. 
Subgrade and street pavement construction shall conform to the requirements set forth in St. Charles County's "Standard Specifications for Highway Construction."
[Ord. No. 99-99 §1, 7-12-1999]
For any development fronting on an existing road or street, it shall be the responsibility of the developer to improve the road or street in conformance with County specifications to the centerline of the road or street, plus an additional twelve (12) feet of width as per County specifications. On all other subdivisions where an existing street is not improved, driveway access must be from interior streets.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 10-041 §63, 6-2-2010; Ord. No. 18-013 § 2, 1-29-2018; Ord. No. 20-031, 3-30-2020[1]]
The County may accept for dedication private streets that are brought up to public street standards in existence at the time public dedication is requested.
[1]
Editor's Note: Ord. No. 20-031 also changed the title of this Section from "Designation of Private Streets" to "Dedication of Private Streets."
[Ord. No. 99-99 §1, 7-12-1999]
A. 
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 or of something equal, 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. Such monuments shall be installed by the subdivider as soon as is 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 sidelines.
[Ord. No. 04-053 §1, 4-13-2004]
A. 
Applicability. These standards shall apply only to subdivisions that were platted prior to November 3, 2003, that have lots of one (1) acre or larger in size and whose lot owners seek to upgrade their privately maintained streets and storm sewer improvements for dedication to and maintenance by the public.
B. 
Right-Of-Way Width. Forty-two (42) feet.
C. 
Pavement Width.
1. 
Minimum of twenty (20) feet in subdivisions with lot sizes of three (3) acres or larger.
2. 
Minimum of twenty-four (24) feet in subdivisions with lot sizes of one (1) to three (3) acres.
D. 
Cul-De-Sac Requirements. Turnarounds shall have a minimum pavement radius of forty (40) feet and a minimum right-of-way radius of forty-eight (48) feet.
E. 
Pavement Requirements. Minimum standards are as follows:
1. 
Five and one-half (5.5) inches of asphalt on six (6) inches of rock on prepared earth subgrade.
2. 
Six and one-half (6.5) inches of asphalt on three (3) inches of rock on prepared earth subgrade.
3. 
Seven and one-half (7.5) inches of asphalt on prepared earth subgrade.
4. 
If a substitute pavement section is proposed, an engineering analysis must be provided showing the substituted section meets or exceeds the structural strength and durability of the sections listed above.
5. 
Any rock base shall extend beyond the edge of the asphalt pavement by six (6) inches on both sides for a total width of twenty-one (21) feet or twenty-five (25) feet, respectively, in accordance with pavement widths noted in Subsection (C) above.
6. 
Compacted material shall be placed against the edge of the asphalt pavement. This material shall at a minimum match the thickness of the pavement and have a minimum width of six (6) inches.
F. 
Street Grade. Street grades shall match the existing grades. Where grades are less than one percent (1%) and greater than twelve percent (12%), every effort should be made to meet the one percent (1%) minimum and twelve percent (12%) maximum criteria.
G. 
Storm Sewers. Corrugated metal pipe may be used to drain storm water under streets or driveways provided that the gauge of the pipe meets the following minimum standards:
1. 
Pipes twelve (12) inches to thirty (30) inches in diameter must be 14 gauge.
2. 
Pipes with diameters from greater than thirty (30) inches to forty-eight (48) inches must be 12 gauge.
3. 
Pipes with diameters greater than forty-eight (48) inches must be 10 gauge.
H. 
Roadside Ditches. Roadside ditches shall be cut to fit within the right-of-way or within a permanent drainage easement that will be dedicated to St. Charles County. The ditch slope shall begin a minimum of six (6) inches off the edge of the pavement, and shall not exceed 3:1. The flow line shall be a minimum of three and a half (3.5) feet from the edge of the pavement. The back slope shall be graded to match the existing grade, however, it shall not exceed 1:1.
I. 
Administrative Variances. The County Engineer may vary the minimum standards set out above if the County Engineer finds that practical difficulties caused by terrain or built improvements impose undue burdens or costs on completing the project and that the approved variance will not compromise the County’s ability to maintain the upgraded improvement.
[Ord. No. 13-077 §1, 10-28-2013]
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 03-142 §1(132—134), 10-1-2003; Ord. No. 06-041 §2, 3-28-2006; Ord. No. 10-041 §64, 6-2-2010; Ord. No. 20-098, 12-21-2020]
A. 
In addition to the installation of curbs and gutters along the streets as required by this Chapter, storm sewers shall be required. Such systems will be equipped with adequate curb and yard basins, inlets and outlets, and shall be designed in accordance to St. Charles County's Design Criteria for the Preparation of Improvement Plans and constructed in accordance to the Metropolitan St. Louis Sewer District's "Standard Construction Specifications for Sewers and Drainage Facilities" dated 2009. 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 Director of the Division of Development Review.
B. 
For all subdivisions with lots of one (1) acre or more in size, open drainage swales along the streets may be allowed in lieu of curb and gutter.
C. 
Post-construction stormwater management shall be required in accordance with Section 410.410(D) of the Unified Development Ordinance and designed in accordance with Section 70 of St. Charles County's Design Criteria for the Preparation of Improvement Plans. A maintenance plan and schedule for each stormwater management facility shall be established by the subdivision developer, approved by the Director of the Division of Development Review, recorded and referenced and enforced in the subdivision trust indentures. Stormwater management facilities shall be maintained by the subdivision homeowners. Periodic maintenance shall be required of the facility owners per the approved maintenance plan for the subdivision and Section 420.020 of the Unified Development Ordinance. No modifications shall be made to the facilities without approval from the Department of Community Development.
D. 
Post-Construction Stormwater Management — When Required.
1. 
Water Quality.
a. 
The requirement to provide measures to protect stormwater quality shall be evaluated for all proposed subdivision developments submitted to the Community Development Department for review and approval.
b. 
Water quality treatment is required for all new subdivision developments that disturb an area one (1) acre or greater, including subdivision developments less than one (1) acre that are part of a larger common plan or development, as follows:
(1) 
For all new subdivision developments, measures shall be designed and implemented to prevent or minimize water quality impacts to the maximum extent practicable.
(2) 
For all infill and redevelopments, water quality strategies and technologies, including those that reduce runoff volume, shall be effectively used to the maximum extent practicable. Infill and redevelopments that are subject to but which cannot meet the full water quality requirement due to physical constraints shall be evaluated on a case-by-case basis.
c. 
Water quality treatment is not required in residential subdivision developments with three (3) acre or larger lot sizes.
d. 
If there are known stormwater problems, impaired waterbodies, or other special conditions downstream from a subdivision development, water quality treatment shall be required regardless of land disturbance size.
2. 
Stormwater Detention – Channel And Flood Protection.
a. 
The requirement of stormwater detention shall be evaluated for all proposed subdivision developments submitted to the Community Development Department for review and approval.
b. 
New residential subdivision developments with three (3) acre or larger lot sizes and all other new subdivision developments that have a differential runoff of less than two (2) cfs for the 15-year, 20-minute event shall be exempt from detention requirements for channel and flood protection unless there are known stormwater problems, impaired waterbodies, or special conditions downstream from the proposed subdivision development.
c. 
Detention for channel protection (CPv) shall not be required where the one-year post development peak discharge is less than or equal to 2.0 cfs for the entire subdivision development. Channel protection (CPv) shall not be required if the subdivision development discharges directly to permanent lakes or to enclosed pipe systems with adequate hydraulic capacity that discharge to permanent lakes or stormwater management facilities.
d. 
The flood protection (Qp) requirements may be waived by the Director of the Division of Development Review where conveyance is provided directly to a major river system, lake, or wetland that have capacity to handle flow increases at the 10-year level and where it would benefit to discharge the peak flows from the site prior to the peak flows in the receiving, natural system.
e. 
If there are known stormwater problems, impaired waterbodies, or other special conditions downstream from a subdivision development, detention for channel and flood protection may be required at the discretion of the Director of the Division of Development Review regardless of differential runoff or minimum lot size.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 02-122 §1, 7-30-2002]
A. 
All buildings, structures, and uses of land in the unincorporated area of St. Charles County shall hereafter be required with an adequate, safe, and sanitary disposal system for all human, domestic, and industrial wastes. For purposes of this regulation, disposal of sewage or other liquidated wastes shall conform to the methods outlined herein.
B. 
Where a public sanitary sewer main is reasonably accessible, the subdivision shall be provided 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 Department of Natural Resources. Verification by the service provider shall be submitted with the preliminary plat, if required by the Director of the Division of Planning and Zoning.
C. 
Where a public sanitary sewer system is not reasonably accessible according to the local wastewater regulatory authority, but where plans for the installation of sanitary sewers in the vicinity of the subdivisions have been prepared and approved by the Missouri Department of Natural Resources, the developer shall install sewers in conformity with such plans. Where immediate connection is not possible, and until such connection with the sewer system in the district can be made, the use of private sewage treatment facilities may be permitted, provided such disposal facilities are installed and maintained in accordance with the regulations and requirements of the County and the Missouri Department of Natural Resources.
D. 
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 the preceding paragraph, 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 County and/or Missouri Department of Natural Resources. Individual sanitary disposal systems shall not be allowed on lots of less than three (3) acres in area. Each individual lot must provide adequate area for lateral drain field and an auxiliary area for a drain field.
[1]
Editor's Note—For designation of the division of planning and zoning, see ord. no. 02-204 adopted 12-23-2002 set out in ch. 132 of this code and ord. no. 03-195 adopted 12-31-2003.
[Ord. No. 99-99 §1, 7-12-1999]
Where a public water supply main is reasonably accessible, 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. Verification by the service provider shall be submitted with the preliminary plat, if required by the Director of the Division of Planning and Zoning. Individual water systems (wells) shall not be allowed on lots of less than three (3) acres in area. Four (4) copies of plans indicating the placement of water lines and fire hydrants shall be conveyed directly to fire district or department serving the proposed subdivision. Enforcement of fire flow regulations shall remain the responsibility of the fire districts.
[1]
Editor's Note—For designation of the division of planning and zoning, see ord. no. 02-204 adopted 12-23-2002 set out in ch. 132 of this code and ord. no. 03-195 adopted 12-31-2003.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 06-041 §2, 3-28-2006; Ord. No. 10-041 §65, 6-2-2010]
A. 
Prior to starting any of the work covered by the above plans, after approval thereof, the developer shall make arrangements to provide for inspection of the work, sufficient, in the opinion of the County Engineer (or, in the case of stormwater management facilities, in the opinion of the Director of Development Review), to assure compliance with the plans and specifications as approved.
[Ord. No. 20-098, 12-21-2020]
B. 
The County Engineer, or a duly authorized representative, shall make all necessary inspections of all pavement and storm sewer construction, along with all sanitary sewer construction within the right-of-way.
[Ord. No. 20-098, 12-21-2020]
C. 
The Director of Development Review, or a duly authorized representative, shall make all necessary inspections of all stormwater management facilities.
[Ord. No. 20-098, 12-21-2020]
D. 
A minimum of twenty-four (24) hours' notice shall be given to the County Engineer's office and the office of the Director of Development Review prior to the commencement of construction.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 18-015 § 4, 1-29-2018]
The construction of all improvements required by these rules and regulations shall be completed within two (2) years from the date of approval of the improvement plans, unless good cause can be shown for the granting of an extension of time by the Director of Community Development.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 20-098, 12-21-2020]
Where the subdivision contains sewers, sewage treatment plants, water supply systems, stormwater management facilities, or other physical facilities that are necessary or desirable for the welfare of the area or that are of common use or benefit and which are not or cannot be satisfactorily maintained by an existing public agency, provision shall be made which is acceptable to the agency having jurisdiction over the location and maintenance of such facilities and for the proper and continuous operation, maintenance, and supervision of such facilities.
[Ord. No. 99-99 §1, 7-12-1999]
Trust indentures will be required and reviewed by the Division of Planning and Zoning regarding maintenance of common ground and private improvements.
[1]
Editor's Note—For designation of the division of planning and zoning, see ord. no. 02-204 adopted 12-23-2002 set out in ch. 132 of this code and ord. no. 03-195 adopted 12-31-2003.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-054 §1, 4-25-2001; Ord. No. 10-041 §66, 6-2-2010]
A. 
Whenever the tract to be subdivided is of such unusual size or shape, or contains such topographic conditions or characteristics that the strict application of the requirements contained in this Chapter, except as provided in Section 410.480(D) below, would impose practical difficulties or particular hardship, the Planning and Zoning Commission and Governing Body may vary or modify any of the requirements of this Chapter so that the public interest is secured and the general intent of this Chapter is preserved.
B. 
In granting variances, the Governing Body may require such conditions as will, in its judgment, secure the objectives of this Chapter.
C. 
In the event of such an appeal, the Commission shall report to the Governing Body, disclosing in what respect the petitioner's application for an exception and facts offered in support thereof met or failed to meet the aforementioned requirements. The Governing Body may affirm, reverse, modify, or amend in whole or part of any determination of the Commission. It shall require the affirmative vote of five (5) County Council members to overturn a negative recommendation of the Planning and Zoning Commission or to modify or amend any determination of the Commission on any variance application. A majority of the County Council shall be sufficient to affirm any determination of the Commission.
D. 
Upon written request to the Commission, an applicant can seek a waiver of the requirement that any new lot platted shall not have frontage on a County road or thoroughfare as shown on the current Thoroughfare Plan as approved by the Governing Body. The individual request shall be reviewed and granted where there is a topographic hardship or if an equal or better alternative can be provided that is not in agreement with this ordinance. The Director of Community Development and the County Engineer shall review the request and provide a recommendation to the Commission regarding the merits of the request. The Commission shall approve or deny the waiver request.
[Ord. No. 99-99 §1, 7-12-1999; Ord. No. 01-111 §11, 9-26-2001]
There shall be a review fee as set by ordinance accompanying any request for a variance.
[1]
Cross Reference—As to specific fees, see ch. 425 of this code