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09/12/97 16:50 GR/GSI—SACTO - 12094646139 020 <br /> dS[Field MOUI005 and P"u,ea <br /> alternately surging the well with a vented surge block, then purging the well with a pump <br /> or bailer to remove accumulated sediments and draw groundwater into the well. <br /> Development continues until the groundwater parameters (temperature, pll, and <br /> conductivity) have stabilized. Well development is performed by Gettler-Ryan Inc. of <br /> Dublin, California. Wells are monitored and sampled on a quarterly basis by Unocal <br /> Corporation's monitoring and sampling contractor. <br /> NtorinE and ampling of Drill Cuttings <br /> Drill cuttings are stockpiled on and covered with plastic sheeting. Stockpile samples are <br /> collected and analyzed for disposal classification on the basis of one composite sample per <br /> 100 cubic yards of soil. Stockpile samples are composed of four discrete soil samples, <br /> each collected from an arbitrary location on the stockpile. The four discrete samples are <br /> then composited in the laboratory prior to analysis. <br /> Each discrete stockpile sainple is collected by removing the upper 3 to 6 inches of soil, and <br /> them driving the stainless steel or brass sample tube into the stockpiled material with a <br /> hand, mallet, or drive sampler. The sample tubes are then covered on both ends with <br /> teflon sheeting or aluminum foil, capped, labeled, and placed in a cooler with blue ice for <br /> preservation. A chain-of-custody form is initiated in the field and accompanies the selected <br /> soil samples to the analytical laboratory. Stockpiled soils are covered with plastic sheeting <br /> after completion of sampling. <br /> VES VBDDr Stream Sampk Collceliga <br /> Influent and effluent vapor stream samples are collected by connecting the sample bag to <br /> the sampling port via clean tygon tubing. The sample bag is then placed inside the air <br /> sampling container, which is attached to an air pump. To obtain a sample from the VES <br /> vapor stream, the air pump is activated, inducing a vacuum inside the sample container. <br /> The induced vacuum allows the sample bag to inflate by drawing an air sample from the <br /> VES vapor stream via the sample port and tubing. Once the sample bag is full, it is placed <br /> in a separate container to protect it from sunlight, and delivered to the laboratory for <br /> analysis. <br /> A-3 <br />