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W, <br /> c+a <br /> Chevron U.S.A. - Page 8 <br /> for shipment to the analytical laboratory. <br /> Between sampling attempts, the sampler will be dissassembled and washed in a <br /> trisodium phosphate (TSP) solution, rinsed twice with purified water, and <br /> reassembled with brass rings to minimize the potential of spreading contaminar <br /> among samples, if any were present. soils will be classified according to the <br /> Unified Soil Classification System. <br /> A health and safety plan will be prepared for the work to be accomplished at <br /> the subject property prior to commencement of the field portion of the <br /> investigation. <br /> Each monitoring well would be constructed through hollow-stem auger using 4- <br /> inch flush-thread pvc schedule 40 well pipe. screened intervals are anticipated <br /> to he constructed utilizing schedule 40 pvc flush-thread 0.020 inch well screen. <br /> r <br /> �.: Any well anticipated to be utilized for ground water recovery will have the well <br /> intake area designed based upon a uniformity coefficient developed from grain- <br /> 1 , size analysis conducted on aquifer materials encountered at the specific well <br /> location and depth. It is anticipated that the screened interval would consist of <br /> sufficient screening to accommodate a ten foot screened interval above the <br /> encountered ground water level, with the ultimate depth dependant upon <br /> subsurface conditions encountered such as aquitards or confining bodies <br /> such as clay layers. A No. 3 graded sand would be used as a filter media around <br /> r • <br /> the screened interval, and completed to an equivalent depth of 2 feet above the <br /> well screen. A seal composed of bentunite pellets would be placed to an <br /> w` approximate thickness of 3 feet atop the filter media. The remaining annulus <br />- DAMFS& I1 OORri <br />