Specifications include, but are not limited to: a. Clear the west (upstream) outside wall of debris and sand down to 1 foot (or to bedrock, whichever is less) and tapered five feet upstream to meet existing grade. b. Clear the entire inside down to bottom of 90-degree pipe bend (elevation 157.0 feet) of debris and sand (under horizontal and inside vertical grate). The bottom elevation of the ring portion is 169.0 feet – see picture #1. The top elevation of the Intake is 176.5 feet. Normal water elevation is 180.8 feet but will vary above or below this measurement depending upon the then current river flow. c. All silt or debris shall be pumped or moved out of the Offshore Intake structure at a minimum of 20 feet downstream of the Offshore Intake and deposited back into the Potomac River thereby allowing the material to continue to flow downstream and away from the structure. d. Contractor shall provide the FW Project Manager or his designee, with a written daily diver inspection report of work performed. The report shall clearly state the volume of debris removed, shading in area where debris was removed on attached drawing (Intake #2 Plan), number of hours worked and the percentage of the total Offshore Intake cleaned to date, see Attachment 4. e. Report the amount of solids build-up in the horizontal pipe, without penetrating or entering the pipe. Bidders may assume FW requires only one measurement at the beginning of the horizontal pipe at the 90-degree bend and a verbal assessment of whatever can be seen down the pipe. i. After all cleaning is completed, divers shall remove the offshore sample pump discharge screen, clean it and reinstall after Fairfax Water personnel blow the sample lines clear. The FW Project Manager, or his designee, will inspect site to ensure completeness and final acceptance.