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ATTACHMENT B <br /> FIELD PROCEDURES <br /> Chevron Service Station 9-1452, 334 East Main Street, Ripon, California <br /> instrument was / will be calibrated prior to drilling using a 100-ppm isobutylene standard (in <br /> air) and a sensitivity factor of 55, which relates the photo-ionization potential of benzene to <br /> that of isobutylene at 100 ppm The results of the field-testing was / will be noted on the <br /> boring logs PID and FID readings are useful for indicating relative levels of contamination, <br /> but cannot be used to evaluate hydrocarbon levels with the confidence of laboratory analyses <br /> Soil Sampling for Stockpiled Soil <br /> Soil samples were / will be collected by advancing a 2-inch diameter brass sample liner into <br /> the soil stockpile, after removing approximately 6-inches to 1-foot of surface material in the <br /> sample location One composite of four soil samples was / will be collected per <br /> approximately 100 cubic yards of soil Soil samples for chemical analysis were / will be <br /> retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The <br /> samples were / will be then sealed in zip-lock bags, placed on ice, and transported to the <br /> laboratory accompanied by the appropriate chain-of-custody documentation <br /> Slug Testing <br /> The slug test consists of quickly raising (slug in) or lowering (slug out) the water level in a <br /> well from equilibrium and measuring the subsequent rate of rise or fall, respectively Slug in <br /> and slug out tests will be performed on each well using a slug of know volume to derive <br /> values for transmissivity(T) and hydraulic conductivity(K) <br />