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a <br /> Tri-Vali�ay Growers November 9, 1987 <br /> Pro(ea.No. 1562G Page 5-2 <br /> i <br /> with a 140-pound hammer. Soil samples were field checked for the presence <br /> of product odor and visible product after each sample as collected. At each <br /> sampling, interval, the liner containing the soil sample having the strongest <br /> product odor was immediately labeled and preserved by capping the ends of <br /> w. the liner with aluminum foil and plastic caps. Sealed liners were placed on <br /> i , <br /> ice and shipped to a state-certified laboratory (Sequoia Laboratory, Redwood <br /> City, California) with chain-of-custody documentation for chemical analysis. <br /> A lithology log of the subsurface conditions was prepared for each boring in <br /> the field by an E=xceltech geologist using the Unified Soil Classification <br /> System and stratigraphic interpretation. Exploratory baring logs are <br /> presented in Appendix C. <br /> .p. 5.2 MONITORING WEl L CONSTRUCTION <br /> Upon completion, the exploratory boreholes were converted into groundwater <br /> � monitoring wells. The monitoring wells were constructed using 2-Inch <br /> diameter schedule 40 PVC blank and factory slotted (0.02-inch) casing with <br /> flush threaded couplings. No solvents or cements were used. The wells were <br /> installed to monitor the uppermost water bearing stratum. Construction <br /> details of each well are presented in Appendix A. <br /> r : <br /> After the casing was installed the annulus around the screen section of the <br /> _ well was filled with No. 2112 sand to approximately one foot above the top <br /> of the screen. Four feet of bentonite pellets were then placed on top of the <br /> sand and hydrated to form a seal. Four feet of bentonite was used to provide <br />