A04_Statement_of_Work.pdf

STATEMENT OF WORK

DELIVERY OF WATER CONTROL STRUCTURES AND MATERIALS TO SAN LUIS NWR

1. GENERAL: The contractor will manufacture and/or procure and deliver pre-cast concrete water control weirs with pipe stubs, pre cast solid wall water control weirs for installation as headwalls, weir boards, pipe and couplers to various locations of the San Luis NWR. Specific materials requirements are provided in Section 2 and again in Appendix A.

2. SCOPE:

A. QUALITY CONTROL

All workmanship and materials furnished and supplied under this specification are subject to inspection by the project technical coordinator and site foreman including all operations from the selection and production of materials through to final acceptance of delivered materials. The technical coordinator reserves the right to reject any materials which are not in accordance with the requirements of this specification.

B. SPECIFICATIONS

B.1 MATERIALS SUPPLIED TO THE PROJECT

One (QTY 1) 4’x7’ pre-cast concrete water control weir with 5’ stub of 30” ADS Series 95 Plain End Polyethylene Pipe

Two (QTY 2) 4’x7’ pre-cast concrete water control weir with 5’ stub of 24” ADS Series 95 Plain End Polyethylene Pipe

Two (QTY 2) 4’x7’ pre-cast concrete water control weir without stub solid wall (headwall design)

Two (QTY 2) 4’x6’ pre-cast concrete water control weir with 5’ stub of 24” ADS Series 95 Plain End Polyethylene Pipe

Four (QTY 4) 4’x6’ pre-cast concrete water control weir without stub solid wall (headwall design)

Ten (QTY 10) 4’x5’ pre-cast concrete water control weir with 5’ stub of 24” ADS Series 95 Plain End Polyethylene Pipe

Fourteen (QTY 14) 4’x5’ pre-cast concrete water control weir without stub solid wall (headwall design)

480 Feet (QTY 24) 24" ADS SERIES 95 PLAIN END POLYETHYLENE PIPE – VIRGIN, 20’ sections

30 (QTY 30) 24" MAR MAC COUPLER

40 Feet (QTY 2) 30" ADS SERIES 95 PLAIN END POLYETHYLENE PIPE – VIRGIN, 20’ sections

2 (QTY 2) 30” MAR MAC Coupler

152 (QTY 152) 2X6X551/2" REDWOOD WEIR BOARDS

B.2 PRECAST CONCRETE WATER CONTROL STRUCTURES

Precast concrete weir (riser) structures shall conform to the sizes and dimensions as listed above. Precast concrete weirs shall have two (twin) weir bays for stop logs. Each structure shall have a minimum 5-foot-long stub of pipe cast into the structure with the type and dimension equal to that of the attached pipe.

The end of the pipe stub to be cast into the concrete structure shall be cut even and square, and set flush with the face of concrete. Structures shall have the pipe cast such that the invert is at or near the structure flowline. The surface of pipe to be embedded into concrete shall be clean of oils, dirt, and loose debris prior to being cast into the structure. All structures shall be manufactured by Briggs Manufacturing, or approved equal.

B.3 WOOD STOPLOGS/WEIR BOARDS

A complete set of stoplog boards shall be supplied for each structure cast with a pipe stub. Each board will be cut to fit individual structures including a 3/8-inch clearance on each end to allow for swelling when wet. Stoplogs shall be 2x6 rough cut (full 2 inch thickness) redwood. Wood stoplogs shall be free of knots or knotholes.

B.4 HDPE PIPE

Water tight HDPE (high density polyethylene) pipe shall be of the nominal size indicated in the project description sheet. The pipe shall be profile wall (corrugated) with a smooth interior and meet the requirements of ASTM F2648 or F2306, and ASTM D3350.

B.5 HDPE PIPE COUPLERS

Couplers for HDPE pipe necessary to complete installation in addition to the integral bell and spigot joints shall be Mar Mac Products “Polyseal” couplers

3. PLACE OF DELIVERY AND PERIOD OF PERFORMANCE:

Deliveries will be to two locations within the San Luis National Wildlife Refuge, Los Banos, CA 93645.

Deliveries shall be made by no later than August 20, 2021.

An initial delivery of: (1) 4’x7’ weir with 30” stub and (2) 4’x7’ headwall weirs; (2) 4’x’6’ weirs with 24” stub and (4) 4’x6’ headwall weirs; and (4) 4’x5’weirs with 24” stub and (8) 4’x5’ headwall weirs must be delivered along with 40’ of 30” pipe; 200’ of 24” pipe; couplers and stoplogs for each weir structure must the delivered by July 19th, 2021 to the San Luis Unit.

The remaining balance of materials must be delivered by August 20th, 2021 to the Freitas Unit.

Delivery Location(s):

1. San Luis Unit-Maintenance Shop 7376 S. Wolfsen Rd Los Banos, CA 93635

2. Freitas Unit-Gun Club Road Corrals 37°13'55.17"N, 120°52'30.42"W Terminus of Gun Club Road Gustine CA 95322