All subdivision construction shall comply with the specifications and design standards as outlined hereinafter. Construction plans and specifications, which are required to be submitted to the general superintendent under section 10.02.044 of this article at least ten (10) days prior to the meeting of the commission at which final plat is to be considered, shall include, but not necessarily be limited to, the following:
(1) 
Certification.
All construction plans shall be prepared by a registered professional engineer, registered in the State of Texas, and each plan sheet shall bear the engineer’s certification and seal.
(2) 
North arrow.
All construction plans shall include a north arrow, scale or scales, and date.
(3) 
Construction detail plan.
The construction detail plan sheet or sheets shall be a composite of all details of construction, such as detail of proposed inlet boxes, manholes, cleanouts, sewer and water service lines, street cross-sections, curb and gutter sizes, fire hydrant details, valve box details, headwalls or any other details necessary to show intent of construction.
(4) 
Drainage.
A plan of the proposed storm sewer system. All culverts, bridges and channels shall be designed in accordance with the Texas Department of Transportation Hydraulic Manual. The general superintendent will be supplied with a copy of all required drainage area maps and computation sheets.
(5) 
Plan-profile sheets.
The plan-profile sheets shall show the finished plan of all proposed utilities, stormwater drainage facilities and street construction. The profiles shall indicate the existing natural ground, proposed flow lines of sanitary sewers, storm sewers, channels, and top of curb.
(1987 Code, sec. 23-51)
(a) 
Street design standards.
(1) 
At each street intersection the curb and gutter, if installed, which shall be optional to the developer, shall be rounded with a radius “R” measured to the face of curb, varying with the interior angle as specified in the following table:
TABLE OF CURB RETURNS
Interior Angle in Degrees
Intersection of Two Minor or Collector Streets -R in Feet
Intersection of Collector or Minor Street and Arterial Streets -R in Feet
Intersection of Arterial Streets -R in Feet
150-145
15
25
25
145-140
15
25
28
140-135
15
25
30
135-80 [85]
15
25
35
85-75
20
30
50
75-65
25
35
80
65-55
30
40
90
55-45
35
45
110
45-00
35
45
150
(2) 
At each street intersection the property line shall be rounded with a curve of radius “R,” varying with the interior angle as specified in the following table:
TABLE OF PROPERTY LINE INTERSECTION RETURNS
Interior Angle in Degrees
R Intersection of Minor or Collector Streets
(Ft.)
R Intersection of Arterial Streets
(Ft.)
150-145
5
15
145-140
5
18
140-135
5
20
135-125
5
25
125-85
5
25
85-75
10
40
75-65
15
70
65-55
20
80
55-45
25
100
45-00
25
140
(3) 
No street grade shall be less than 0.30 percent (0.3 feet vertical per 100 feet horizontal).
(4) 
Horizontal curves shall not be less than the following:
Street Type
Centerline Radius
Arterial
700 feet
Collector
400 feet
Minor
100 feet
(5) 
Street cross-sections shall be in accordance with the details shown on figure I-A, in the appendix at the end of this article.
(6) 
Concrete monolithic, optional curb and gutter shall be constructed in accordance with the details shown on figure I-B or figure I-C, in the appendix at the end of this article.
(7) 
Parkways shall have a maximum slope of 4:1 (4 feet horizontal to 1 foot vertical) toward the street.
(8) 
A minimum of one benchmark per subdivision shall be established on an iron rod, one-half inch in diameter and four (4) feet long, embedded in concrete six (6) inches in diameter and four (4) feet long at a location shown on the construction plans. The elevation of all benchmarks shall be established with reference to U.S. Geological Survey datum and shown on the construction plans.
(9) 
Subgrade, base and surfaces other than those shown on figure I-A shall be considered by the general superintendent upon presentation by the developer’s engineer of design data substantiating that the subgrade, base and surface will sustain a four thousand two hundred fifty (4,250) pound wheel load on minor and collector streets, and a twelve thousand (12,000) pound wheel load on arterial streets, in accordance with Texas Department of Transportation Soil Testing Procedures Triaxial Compression Test; subject to the approval of the general superintendent.
(10) 
Driveway turnouts shall be constructed in accordance with the details shown on figure I-D and figure I-E, in the appendix at the end of this article.
(b) 
Street construction specifications.
The Texas Department of Transportation Standard Specifications for Construction of Highways, Streets and Bridges shall be adopted for general use to control construction of streets. When the term “the engineer” is used in the Texas Department of Transportation Standard Specifications, it shall be interpreted to mean the general superintendent or his authorized representative.
(1) 
Preparation of subgrade.
Subgrade materials shall be compacted to a minimum distance of one (1) foot back of the back of the curb and gutter and six (6) inches in depth, to a density of ninety-five (95) percent as determined by the Standard Proctor Compaction Test. The developer shall provide the general superintendent with a certification from an independent testing firm that the compaction required has been achieved. Base material shall not be placed on subgrade material that fails to meet the compaction requirements.
(2) 
Concrete curb and gutter.
Concrete for curb and gutter shall have a minimum compressive strength of three thousand (3,000) pounds per square inch at twenty-eight (28) days. All honeycomb shall be cement grout plastered prior to backfilling. All concrete construction shall be cured a minimum of seven (7) days and backfilled prior to placing the abutting street base material. Optional curb and gutter shall have a brush or float finish so as not to be left with a slick or glossy finish.
(3) 
Base materials.
The specifications for base material proposed for use on the streets within a subdivision shall include detailed gradation requirements and additive requirements based upon presentation, by the developer’s engineer to the general superintendent, of data substantiating that the base material specified, when used in conjunction with the subgrade material and surface, will sustain a four thousand two hundred fifty (4,250) pound wheel load on minor and collector streets and a twelve thousand (12,000) pound wheel load on arterial streets, in accordance with Texas Department of Transportation Testing Procedures, Triaxial Compression Test; subject to the approval of the general superintendent. All base materials shall be compacted full depth to a density of ninety-five (95) percent as determined by the Standard Proctor Compaction Test. The developer shall provide the general superintendent with a certification from an independent testing firm that the compaction required has been achieved. Asphaltic concrete surface material shall not be placed on base material that fails to meet the compaction requirements.
(A) 
Standard base.
Cement stabilized gravel base, meeting the requirements of these specifications, shall be the standard base material for street construction within the city and shall be used for all new street construction.
(B) 
Cement stabilized base.
Cement stabilized base shall be designed and constructed in general conformity with Texas Department of Transportation Specifications for Cement Stabilized Base.
(4) 
Hot-mix, hot-laid, asphaltic concrete surface.
Hot-mix, hot-laid, asphaltic concrete surfaces shall be designed and constructed in general conformity with Texas Department of Transportation Specifications for Hot Mix Asphaltic Concrete Pavement (Class A) Type “D”; all asphaltic concrete shall have a density of not less than ninety-five (95) percent of the laboratory compacted density. The developer shall provide the general superintendent with a certification from an independent testing firm that the compaction required has been achieved.
(1987 Code, sec. 23-52)
(a) 
Stormwater drainage system design standards.
(1) 
Curb inlets.
Curb inlets shall have a minimum opening of four (4) feet.
(2) 
Storm sewer and culvert pipe.
Storm sewer and culvert pipe shall be precast reinforced concrete pipe and shall conform to ASTM Designation: C76-Class 3. The minimum size pipe allowed shall be fifteen (15) inch diameter.
(3) 
Concrete.
All concrete used in connection with drainage facilities shall have a minimum compressive strength of three thousand (3,000) pounds per square inch at twenty-eight (28) days.
(4) 
Channels.
Unlined channels shall have maximum side slopes of one (1) foot vertical to four (4) feet horizontal (4:1).
(b) 
Stormwater drainage system construction specifications.
(1) 
The applicable sections of the Texas Department of Transportation Standard Specifications for Construction of Highways, Streets and Bridges shall be adopted for general use to control construction of stormwater drainage facilities. When the term “the engineer” is used in the Texas Department of Transportation Standard Specifications, it shall be interpreted to mean the general superintendent or his authorized representative.
(2) 
Cover and backfill.
All stormwater drainage system facilities placed within the limits of street subgrades shall have a minimum cover below subgrade of one and one-half (1.5) feet and shall be backfilled with uniformly graded gravel compacted in six (6) inch layers to ninety-five (95) percent Standard Proctor Density.
(1987 Code, sec. 23-53)
All water systems shall be designed and constructed in accordance with the specifications herein outlined and in general conformity with Texas Commission on Environmental Quality Rules and Regulations for Public Water Systems.
(1) 
Design standards.
(A) 
Fire hydrant location.
Fire hydrants shall be located so that no building in an industrial or commercial area shall be more than two hundred fifty (250) feet from a fire hydrant and no house in a residential area shall be more than five hundred (500) feet from a fire hydrant. Such measurements shall be made along the curb or along the edge of the pavement.
(B) 
Distribution system pipe sizes.
All fire hydrants shall be connected to a minimum six (6) inch diameter main. Water lines serving more than two (2) houses shall not be less than six (6) inches in diameter.
(C) 
Valves.
The water distribution system will be equipped with sufficient gate valves to facilitate repairs without undue loss of service within the system. Valves placed within paved street areas shall be equipped with adjustable height cast-iron valve boxes.
(2) 
Construction specifications.
(A) 
Cover and backfill.
All water distribution system facilities placed within the limits of street subgrades shall have a minimum cover below subgrade of one and one-half (1.5) feet and shall be backfilled with uniformly graded gravel compacted in six (6) inch layers to ninety-five (95) percent Standard Proctor Density. Water lines placed outside of street subgrades shall have a minimum cover of two (2) feet below finished surfaces and shall be backfilled with soil compacted to ninety-five (95) percent Standard Proctor Density. Bedding placed around the pipe shall be in accordance with the pipe manufacturer’s recommendations.
(B) 
Pipe materials.
All pipe and fittings used within the water distribution system shall have a minimum working pressure of one hundred fifty (150) pounds per square inch. Pipe and fittings shall be jointed in accordance with the pipe manufacturer’s recommendations.
(C) 
Water meter boxes.
All water meters shall be placed in an approved type water meter box.
(D) 
Pressure test.
Prior to final preparation of street subgrades, all water distribution systems shall be subjected to and pass a hydrostatic pressure test with one hundred twenty (120) pounds per square inch pressure for at least one (1) hour. The general superintendent shall be notified of the time the test is to be made and he or his authorized representative shall be present during the test. If the water distribution system fails to withstand the test, the necessary corrections shall be made and the system retested.
(E) 
Sterilization.
Each unit of the completed water distribution system shall be sterilized with chlorine before acceptance for domestic use. The developer shall provide the general superintendent with a copy of the health department bacteriological test data indicating that the completed distribution system has been tested and sterilized.
(1987 Code, sec. 23-54)
All sanitary sewer systems shall be designed and constructed in accordance with the specifications herein outlined and in general conformity with Texas Commission on Environmental Quality Design Criteria for Sewerage Systems.
(1) 
Design standards.
(A) 
All lots within a subdivision shall be served by a sanitary sewer system where it is feasible to connect to the existing or proposed city sanitary sewer system. Where it is not feasible to connect to the existing or proposed city sanitary sewer system, as determined by the general superintendent and planning commission, lots may be served by individual septic tanks.
(B) 
Collection system pipe sizes.
Sanitary sewage collection system mains shall be a minimum of six (6) inches inside diameter. Service laterals to serve one (1) house shall be a minimum of four (4) inches inside diameter. Service laterals shall extend from the main to the property line.
(C) 
Manholes and cleanouts.
Sanitary sewer manholes shall be placed no further apart than four hundred fifty (450) feet and at points of change in alignment, grade, size of main, where sewer main intersections occur and at the end of all sewer lines programmed for extension at a later date. Cleanouts may be used in lieu of manholes at the end of sewer mains that would not be extended. In those cases where a sewer horizontal curvature is required to follow street curvatures, the minimum radius allowable before placing a manhole shall be one hundred (100) feet.
(D) 
Sanitary sewer lift stations.
Sanitary sewer lift stations, where required to properly serve a new development or a subdivision, shall be designed and constructed by the developer at no cost to the city and must be approved by the general superintendent.
(E) 
Protection from surface water inflow.
The tops of all manholes and lift stations in locations other than streets shall be located one (1) foot above the calculated ten (10) year frequency surface water elevation or, with the approval of the general superintendent, provided with bolt-down, sealing type covers.
(2) 
Construction specifications.
(A) 
Pipe materials.
Materials for gravity sanitary sewer pipe may be either rigid or flexible. Rigid pipe shall be good quality extra-strength vitrified clay, bell and spigot, conforming to ASTM Specifications C-200, with flexible compression joints conforming to ASTM Specifications C-425. Flexible pipe shall be unplasticized polyvinyl chloride (PVC) plastic gravity sewer pipe made from clean, virgin, approved class 12454-B PVC conforming to ASTM Specifications D-1784.
(i) 
Joints for PVC pipe shall be compression rubber gasket joints conforming to ASTM Specifications D-1869.
(ii) 
Fittings and accessories shall be manufactured and furnished by the pipe supplier; shall conform to the material and performance requirements of the pipe; and shall have joint configurations identical to that of the pipe.
(iii) 
The maximum pipe deflection allowed after backfilling shall be five (5) percent of the inside diameter.
(iv) 
Field cutting of PVC shall be in strict conformance with manufacturer’s recommendations.
(v) 
Bedding of PVC shall be in strict conformance with manufacturer’s recommendations.
(B) 
Cover and backfill.
All sewage collection system facilities placed within the limits of street subgrades shall have a minimum cover, below subgrade, of one and one-half (1.5) feet and shall be backfilled with uniformly graded gravel compacted in six (6) inch layers to ninety-five (95) percent Standard Proctor Density. Sewer lines placed outside of street subgrades shall have a minimum cover of three (3) feet below finished surfaces and shall be backfilled with soil compacted to ninety-five (95) percent Standard Proctor Density.
(C) 
Prior to final preparation of street subgrades and after backfilling, all sanitary sewer collection systems shall be tested by means of exfiltration on sections not less than two hundred (200) feet long. The test shall be performed by plugging the sewer main at the lower end of the test section and filling a manhole at the upper end of the test section to an average depth of four (4) feet above the lower end with water. Depth measurements will be made at the upper manhole to determine the amount of exfiltration. The total exfiltration shall not exceed five hundred (500) gallons per inch of pipe diameter per mile of pipe per twenty-four (24) hour period. Any line exceeding the allowable exfiltration shall be repaired or replaced and retested until the line is within the limits of allowable exfiltration.
(D) 
Flexible sewer pipe deflection test.
After backfilling and prior to exfiltration testing, all flexible sewer pipe shall be tested for deflection with a solid plug with a diameter of ninety-five (95) percent of the pipe diameter with no deflection. Any pipe line or portion of line that will not allow easy passage of the test plug will be replaced and retested.
(E) 
Bedding sand placed around the pipe shall be in accordance with the pipe manufacturer’s recommendations.
(1987 Code, sec. 23-55)
In instances where quality of any material or construction is in question, where it is deemed necessary by the general superintendent that tests in addition to those herein specified be made prior to, during or at the time of completion of construction, same shall be furnished by the subdivider or developer at their expense upon written request by the general superintendent. Such tests shall be performed by a commercial testing laboratory and shall be in accordance with common engineering practice.
(1987 Code, sec. 23-56)
All subdivision construction shall be constructed to the lines and elevations shown on the construction plans approved by the general superintendent. Vertical and horizontal control of construction shall be accomplished by use of offset type cut or fill stakes. Said stakes shall be set at a maximum spacing of fifty (50) feet and shall be set at a maximum spacing of twenty-five (25) feet within the limits of vertical or horizontal curves. The horizontal offset and vertical cut or fill to the facility being constructed from the stakes shall be marked on the stake or shown on a sheet which shall be available for inspection by the general superintendent at all times during construction.
(1987 Code, sec. 23-57)
The subdivider or developer shall erect at least one (1) street sign at each street intersection within the subdivision. Said street signs shall be reflectorized matt or aluminum panels with white lettering on a green background. The size and shape of the sign panels shall be approved by the city prior to installation. The street sign panels shall be mounted on galvanized steel pipe with a 2-3/8 inch outside diameter, 0.08 inch wall thickness, and a length of ten (10) feet. Two (2) feet of the pipe shall be placed below the finished ground surface in an eight (8) inch diameter hole filled with concrete. A steel or aluminum cap shall be provided at the top of the pipe.
(1987 Code, sec. 23-58)
(a) 
Monuments shall be set at each block corner of the subdivision. Monuments shall be made of an iron rod, one-half (1/2) inch in diameter and three (3) feet long, embedded flush in concrete, six (6) inches in diameter extending from the final finished ground surface to a minimum depth of eighteen (18) inches.
(b) 
Iron pins no less than one-half (1/2) inch in diameter and eighteen (18) inches long shall be set flush with the final finished ground surface at every lot corner, at all angle points and at the beginning and end of curves.
(c) 
Monuments and iron pins shall be set immediately after completion of utility and street construction, or as the general superintendent may require.
(d) 
The location of all monuments and iron pins shall be shown on the final plat and on the street construction plans.
(1987 Code, sec. 23-59)