Page 7-8 M 41-10
7-04 Storm Sewers7-04 Storm Sewers
7-04.1 Description
This Work consists of constructing storm sewer lines in accordance with the Plans, these Specifications, and the Standard Plans , as staked.
7-04.2 Materials
Materials shall meet the requirements of the following sections: Plain Concrete Storm Sewer Pipe 9-05.7(1) Reinforced Concrete Storm Sewer Pipe 9-05.7(2) Steel Spiral Rib Storm Sewer Pipe 9-05.9 Steel Storm Sewer Pipe 9-05.10 Aluminum Storm Sewer Pipe 9-05.11 Solid Wall PVC Storm Sewer Pipe 9-05.12(1) Profile Wall PVC Storm Sewer Pipe 9-05.12(2) Aluminum Spiral Rib Storm Sewer Pipe 9-05.17 Corrugated Polyethylene Storm Sewer Pipe 9-05.20 Steel Rib Reinforced Polyethylene Storm Sewer Pipe 9-05.22 High-Density Polyethylene (HDPE) Pipe 9-05.23 Polypropylene Storm Sewer Pipe 9-05.24 Where steel or aluminum are referred to in this section in regard to a kind of storm sewer pipe, it shall be understood that steel is zinc coated (galvanized) or aluminum coated (aluminized) corrugated iron or steel and aluminum is corrugated aluminum alloy as specified in Sections 9-05.4 and 9-05.5 . Thermoplastic storm sewer pipe includes solid wall PVC storm sewer pipe, profile wall PVC storm sewer pipe, corrugated polyethylene storm sewer pipe, and polypropylene storm sewer pipe. Measurement for payment of the Bid items associated with the storm sewer installation will be based on the diameter of the storm sewer pipe described by the Bid item in the Plans. It is not necessary that all storm sewer pipe on any one project be of the same kind of material. However, all contiguous pipe shall be of the same size, material, thickness, class, and treatment and shall be that required for the maximum height of cover. When schedule A or B storm sewer pipe is specified in the Plans, the Contractor shall provide the specified schedule and diameter but has the option of furnishing any of the acceptable materials shown in the Storm Sewer Pipe Schedules Table.
7-04.3 Construction Requirements
Storm sewers shall be constructed in accordance with Section 7-08.3 .
7-04.3(1) Cleaning and Testing
7-04.3(1)A General
The requirements of Section 7-17.3(2)A shall apply to storm sewers.
7-04.3(1)B Exfiltration Test – Storm Sewers
Prior to making exfiltration leakage tests, the Contractor may fill the pipe with clear water to permit normal absorption into the pipe walls. Leakage shall be no more than 1 gallon per hour per inch of diameter per 100 feet of storm sewer pipe, with a minimum test pressure of 6 feet of water column above the crown at the upper end of the pipe or above the active ground water table, whichever is higher as determined by the Engineer. The length of pipe tested shall be limited so that M 41-10 Page 7-9 Storm Sewers 7-04the pressure on the invert of the lower end of the Section tested shall not exceed 16 feet of water column. For each increase in pressure of 2 feet above a basic 6 feet measured above the crown at the lower end of the test section, the allowable leakage shall be increased by 10 percent. Storm Sewer Pipe Schedules Schedules (Fill Ht.)Dia. (In.) Concrete PVC1PE2 PP4Steel3 2⅔″ × ½″ or Spiral RibAluminum 2⅔″ × ½″ Corr. • Tr. 5 • Plain With Gasketed SeamsSpiral Rib • Tr. 5 • Plain With Gasketed Seams A 2′ − 15′12Plain or Cl. IV SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 18Plain or Cl. IV SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 24Plain or Cl. IV SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 30 Class III PW Allowed0.064″ (16 Ga.)0.075″ (14 Ga.)0.060″ (16 Ga.) 36 Class III PW Allowed0.064″ (16 Ga.)0.075″ (14 Ga.)0.060″ (16 Ga.) 42 Class III PW Allowed0.064″ (16 Ga.)0.105″ (12 Ga.)0.075″ (14 Ga.) 48 Class III PW Allowed0.064″ (16 Ga.)0.105″ (12 Ga.)0.075″ (14 Ga.) B 15′ − 25′12 Class V SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 18 Class V SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 24 Class V SW or PW Allowed0.064″ (16 Ga.)0.060″ (16 Ga.)0.060″ (16 Ga.) 30 Class V PW Allowed0.064″ (16 Ga.)0.075″ (14 Ga.)0.075″ (14 Ga.) 36 Class V PW Allowed0.064″ (16 Ga.)0.075″ (14 Ga.)0.105″ (12 Ga.) 42 Class V PW Allowed0.064″ (16 Ga.)0.105″ (12 Ga.)0.105″ (12 Ga.) 48 Class V PW Allowed0.064″ (16 Ga.)0.105″ (12 Ga.)0.105″ (12 Ga.) 1PVC = Polyvinyl Chloride Pipe, SW = Solid Wall PVC, PW = Profile Wall PVC 2PE = Corrugated Polyethylene Pipe 3Steel pipe options for either 2⅔″ × ½″ corrugations or spiral rib include: Tr. 5 galvanized, Tr. 2 galvanized with gasketed seams, Tr. 5 aluminized, or plain aluminized with gasketed seams. 4PP = Polypropylene Pipe, 12 inch to 30 inch approved for Schedule A and Schedule B and 36 inch to 60 inch diameters approved for Schedule A only. Page 7-10 M 41-10
7-04 Storm Sewers7-04.3(1)C Infiltration Test – Storm Sewers
Whenever the ground water table is above the crown of the higher end of the pipe section at the time of testing, an infiltration test may be performed in lieu of the exfiltration test upon written permission of the Engineer. The maximum allowable limit for infiltration shall be 0.8 gallon per hour per inch of diameter per 100 feet of length with no allowance for external hydrostatic head.
7-04.3(1)D Other Test Allowances – Storm Sewers
Other allowances for infiltration and exfiltration tests shall be in accordance with Section 7-17.3(2)D .
7-04.3(1)E Low Pressure Air Test for Storm Sewers Constructed of Air Permeable
Materials When air permeable pipe is subjected to a low-pressure air test, all of the provisions of Section 7-17.3(2)E shall apply, except that the time in seconds for the pressure drop shall be equal to or greater than the required time as shown in the table below: Time in Seconds for Pressure Drop Pipe Dia. (in)Pipe Length (ft) 50 100 150 200 250 300 350 400 450 500 4 5 9 14 18 22 27 31 36 40 45 6 10 20 30 40 50 60 70 80 85 85 8 18 36 54 71 89 107 114 114 114 114 10 28 56 84 111 139 142 142 142 143 159 12 40 80 120 160 170 170 170 183 206 228 15 63 125 188 213 213 214 250 286 320 360 18 90 180 255 255 257 310 360 410 460 520 21 123 245 298 298 350 420 490 560 630 700 24 160 320 340 370 460 550 640 730 830 920 27 203 390 390 460 580 700 810 930 1040 1160 30 250 430 430 570 720 860 1000 1140 1290 1430 All time values listed in the table are in seconds. If a section to be tested includes more than one pipe size, the total time required can be found by adding the time values for each size of pipe and its corresponding length. Interpolate between valves for pipe lengths not shown. Pipe over 30 inches in diameter shall be tested one joint at a time in accordance with ASTM C1103.
7-04.3(1)F Low Pressure Air Test for Storm Sewers Constructed of Non Air
Permeable Materials When non air permeable pipe is subjected to a low-pressure air test, all of the provisions of Section 7-17.3(2)E shall apply, except that the time in seconds for the pressure drop shall be equal to or greater than four times the time shown in the table listed in Pipe over 30 inches in diameter shall be tested one joint at a time in accordance with ASTM C1103. Reaches of thermoplastic pipe containing no joints shall be exempt from testing requirements. M 41-10 Page 7-11 Storm Sewers 7-047-04.4 Measurement The length of storm sewer pipe will be the number of linear feet of completed installation measured along the invert and will include the length through elbows, tees, and fittings. The number of linear feet will be measured from the center of manhole to center of manhole or to the inside face of catch basins and similar type Structures. The length of testing storm sewer pipe in conformance with Section 7-17.3(2)A will be the number of linear feet of completed installation actually tested.
7-04.5 Payment
Payment will be made for each of the following Bid items that are included in the Proposal: “Plain Conc. Storm Sewer Pipe ____ In. Diam.”, per linear foot. “Class ____ Reinf. Conc. Storm Sewer Pipe ____ In. Diam.”, per linear foot. “Tr. ____ St. Storm Sewer Pipe ____ In. Th. ____ In. Diam.”, per linear foot. “Tr. ____ Al. Storm Sewer Pipe ____ In. Th. ____ In. Diam.”, per linear foot. “Solid Wall PVC Storm Sewer Pipe ____ In. Diam.”, per linear foot. “Profile Wall PVC Storm Sewer Pipe ____ In. Diam.”, per linear foot. “Corrugated Polyethylene Storm Sewer Pipe ____ In. Diam.”, per linear foot. “Schedule ____ Storm Sewer Pipe ____ In. Diam.”, per linear foot. “St. Rib Reinf Polyethylene Storm Sewer Pipe ____ In. Diam”, per linear foot. “High-Density Polyethylene (HDPE) Pipe ____ In. Diam.”, per linear foot. “Polypropylene Storm Sewer Pipe ____ In. Diam.”, per linear foot. The unit Contract price per linear foot for storm sewer pipe of the kind and size specified shall be full pay for all Work to complete the installation, including adjustment of inverts to manholes. “Testing Storm Sewer Pipe”, per linear foot.