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-ala an's <br /> : l ' y <br /> Ai <br /> J L <br /> r,+ Chevron U.S.A. - Page 9 <br /> •, would be backfilled with 3 sand/cement :slurry with 3% bentonite added from the <br /> seal to the surface vault. A locking well head would be installed, and a water- <br /> Y tight surface vault would be placed at grade for well security. The design of the <br /> proposed ground water monitoring wells is in general compliance with the State of <br /> California Department of Water Resources Bulletin 74-88 (Draft) Monitoring Well <br /> Standards OWR 163907). Please refer to Plate 3 at the end of the text which <br /> illustrates typical well construction. <br /> Ground water monitoring wells would be d-:veloped by means of pumping. <br /> Sampling of the monitoring wells would be accomplished by means of a teflon <br /> bailer. Well development water would be retained in drums at the subject <br /> property pending proper disposal by Chevron after results of chemical analysis <br /> were complete. Auger cuttings from the drilling operation will be placed in <br /> steel drums on-site, and drums will be identified as to the boring and depths <br /> j from which the cuttings originated. Those auge. cuttings which do not exhibit <br /> obvious presence contamination by field screening with a portable photoionization <br /> detector will be segregated into "clean" drums for future composite sampling. <br /> Chemical analysis of samples obtained from soil borings will dictate the <br /> appropriate disposition of those contaminated soils by Chevron. Exploratory soil <br /> borings not completed as wells will be backfilled to the surface with cement <br /> `r gnat at the subject property upon termination. <br /> Each well head would :e surveyed, and the existing well heads would be re- <br /> surveyed to establish the surface elevation to a common benchmark. The survey <br /> would be utilized in evaluation of the water surface elevations and ground water <br /> DAME N 4. N10ORF. <br />