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Chesapeake Transfer station Drainage Improvements

  1. This RFP had a pre-bid event.


Virginia, United States
Government
RFP
Download the rfp file: VA_drainage_040711.pdf.

SCOPE OF WORK
1. The proposed scope of work associated with the drainage improvements for the Chesapeake transfer station includes the following:

a. Arrange for utility location and provide surveying needed for project.

b. Remove fence and precast concrete barriers located south of transfer station to allow drain and holding tank installation. Reinstall similar fence south of installed drain to maintain security for transfer station. Replace precast concrete barriers at the direction of owner.

c. Provide and Install approximately 110 lf of 8" dia. Duraslot drains, installed per manufacturer's recommendations for H-20 load at locations along edge of pavement south of transfer station as shown on the drawings. Use variable height Duraslot as needed to maintain slope of 0.5% toward underground holding tank.

d. Provide and Install approximately 160 lf of 12" dia. Duraslot drains, installed per manufacturer's recommendations for H-20 load at locations along edge of pavement north of transfer station as shown on the drawings. Use variable height Duraslot as needed to maintain slope of 0.5% toward underground holding tank.

e. Connect south Duraslot drains to south holding tank using 8" dia. ADS N-12 corrugated plastic pipe (south tank). Maintain minimum slope of 0.5% to tank.

f. Connect north Duraslot drains to north holding tank using 12" dia. ADS N-12 corrugated plastic pipe. Maintain minimum slope of 0.5% to tank.

g. Provide and install 8" dia. plug valve to, cast iron valve box, lid, and valve extensions for surface mounting at existing grade to control flow to south holding tank. Include adapters needed to connect valve to pipe.

h. Provide and install 12" dia. plug valve to, cast iron valve box, lid, and valve extensions for surface mounting at existing grade to control flow to north holding tank. Include adapters needed to connect valve to pipe.

i. Provide and install 6,000 gallon precast concrete or FRP holding tank with two (2) - 2' dia. manhole openings with risers and locking cast iron or FRP lids extending 6" above finished grade. Provide 4" dia. SCH 80 PVC gooseneck vent with SS bug screen.

j. Provide and install 12,000 gallon precast concrete or FRP holding tank with two (2) - 2' dia. manhole openings with risers and locking cast iron or FRP lids extending 6" above finished grade. Provide 4" dia. SCH 80 PVC gooseneck vent with SS bug screen. Tank shall be ballasted to prevent floating under conditions where the tank is empty and the water table is at ground surface.

k. Provide as-built survey of improvements.

l. Provide sedimentation and erosion controls during construction.

m. Provide site restoration including removal of excess soil and construction debris. Fine grade disturbed areas to maintain drainage. Seed and mulch disturbed areas.

n. See drawings for additional information.

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