B08_SOW_2.pdf

STATEMENT OF WORK

Vehicle Washing Discharge Treatment System

Canaan Valley National Wildlife Refuge Davis, West Virginia

December 2024

I. PROJECT DESCRIPTION

A. The work for this contract is to install a vehicle effluent treatment system at the Canaan Valley NWR, Davis, West Virginia. The treatment system shall handle the effluent for a car wash bay by the installation of concrete tank with multi-media filter material and all associated piping and appurtenant work per the attached concept drawing.

B. To visit the site of work, contact Bob Frank, Refuge Manager at 681 481-0059, or by email Robert frank@fws.gov

C. The location for the tank installation and a conceptual design picture of the proposed concrete tank is in the Appendix to this document.

The Contractor shall provide shop drawings for review and approval by the Government prior to construction.

D. The Refuge staff will stake the location for the concrete tank in the field.

E. Site prep and all excavation will be the responsibility of the contractor.

II. SCOPE OF WORK

A. The contractor should visit the site of work, meet with Refuge personnel, and provide a proposal to perform the construction work.

B. Should any unforeseen site conditions or cultural artifacts be encountered during the work, stop work, and notify the onsite Government representative.

C. All construction work shall conforn1 with, or exceed, the relevant guidelines of the latest version of the following codes and standards:

a. West Virginia Department Of Environmental Protection

Regulations

b. ACI (American Concrete Institute)

c. Code of Federal Regulations (CFR) mailto:Robertfrank@fws.gov

d. Local/State codes

e. ASTM (American Society for Testing and Materials)

f. ASTM C858: Standard Specification of Underground Precast Concrete Utility Structures

g. ASTM D1785: Standard Specification for PVC Plastic Pipe

h. The concrete tank shall be made of 4,000 psi concrete. The size of the tank shall be 4' wide by 4' long by 4 feet deep. The concrete wall, top cover and floor thickness shall be 6 inches.

Provide number 4 reinforcing steel, grade 60, for the tank. The rebar shall be spaced at 6 inches on center each way at mid depth for all four concrete walls, top cover, and the floor slab.

The base of the tank shall be on 6" of crushed stone or on undisturbed or compacted base material. A removable access cover shall be provided so the filter media can be changed. The cover shall be watertight with the required gasket material.

1. Sand and gravel media shall be as shown on the concept drawing.

J. The perforated piping in the tank shall be 4-inch diameter schedule 40 PVC pipe. Piping to the tank from the sedimentation tank shall be 3 inch diameter schedule 40 PVC pipe. This shall also be used for the outflow pipe. Refer to the Appendix, page 4 for more details.

k. Install a ½ horsepower sump pump at the new filter tank outlet pipe, and pipe it up to the existing sediment line. Provide all the pipe fittings and all appurtenant work as required, so the piping system is functional. The power source for the pump is approximately 20' away near the existing oil water separator. All wiring shall be perfonned per the National Electric Code.

III CONSTRUCTION SERVICES

A. The Contractor shall install the concrete tank per the shop drawings and specifications, at the location shown on the picture in the Appendix. The new tank shall be installed where the inlet line is in line with the existing sediment tank outlet line. Perform all required excavation and provide all the required pipe fittings and adapters as required. Perfom1 all incidental work as required so that the installed multimedia filter is functional.

1. Shop Drawings and material submittals shall be reviewed by the Contractor's engineer for approval for all the materials to be incorporated into the work for conformance with the project requirements.

2. The Contractor shall be responsible for strict compliance with all provisions of Occupational Safety and Health Administration (OSHA) requirements 29 CFR 1910 and 29CFR 1926 during the performance of the work.

3. Upon completion of the project, all work areas shall be free from debris.

4. Provide manufacturers information for Government approval for all the materials that are being installed.

Appendix - Location for the new multimedia filter tank installation and concept pictures of the concrete tank and multi-media filter system

Location for the new multimedia filter tank installation

The bottom elevation of the outlet pipe from the existing sediment tank is 3,212.117'. The new tank shall be installed where the inlet pipe elevation matches the outlet pipe form the existing sediment tank. The outlet pipe from the new tank shall be 2' beyond the tank, and capped. The refuge plans to install a sump pump at this area, to connect the pipe outflow to the existing sediment line pipe.

: I I

4 INCH PERFORATED PVC PIPE

FLOW FROM

SEDIMENTATION

TANK

: - -------------------------------------------- J : L----------------- ---- I ---------------- --,ij•:I

I L- - - - - - •- - - - .. - - - - - - I I

OUTFLOW

I I ----------- ------1:,_ ... ,.._ -r--,/

CONCRETE MULTIMEDIA FILTER TANK

FLOW FROM

SEDIMENTATION

TANK

r r

OUTFLOW

CROSS SECTION OF CONCRETE

MULTIMEDIA FILTER TANK

I I

-_ -_ - J