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%- ki � <br /> - <br /> ar <br /> 'N7:;ZNA7'.01NA <br /> from each well were analyzed by the following methods: <br /> • Modified EPA Methods 8015 and 8020 <br /> - Total Petroleum Hydrocarbons calculated as gasoline <br /> - Benzene, Toluene, Ethyl Benzene, and total Xylenes (BTEX) <br /> Sample from MW-4, adjacent to the waste oil and motor oil tank field, was alio <br /> f ' analyzed for the following: <br /> • Modified EPA Method 8015 <br /> - T,tal Petroleum Hydrocarbons calculated as diesel <br /> • Standard Methods 503E <br /> i4 <br /> Oil and Grease <br /> EPA Methods 601 and 8010 <br /> Hdlocarbons <br /> Monitoring wells were constructed using four inch diameter, schedule 40, <br /> threaded, PVC casing and schedule 40, threaded, PVC screen. Screen size used <br /> is Shown in the well logs (Appendix 8) Each well was fitted with a threaded <br /> end cap. Screens extended from fifteen to thirty feet below grade. <br /> The gravel pack consisted of No. 2 l.onestar sand. The gravel pack extended <br /> from the base of the screen to th,•Po foot above the screen. A three-foot <br /> 4 ? bentonite seal was placed on the gravel pack. The annular seal was completed <br /> with 95 percent Portland Cement--5 percent bentonite. The wells were encased. <br /> with a t;+elve-inch, flush mount, rlatertight locking christy box. Each well <br /> was fitted with a water proof locking cap and labeled. See boring logs in <br /> Appendix B for well construction details. <br /> The elevation of the wells were surveyed by Wong Engineers, Inc of Stockton, <br /> California. The elevations were relates to a USGS datum. Elevation data is <br /> contained in Table 1. <br /> Or. 30 April 1990, the wells were developed by hand bailing and surging until <br /> pal, conductivity, temperature, and turb-i-dity_measurements__stabilized® _ ____ <br /> - - - - -- <br /> F Approximate, test well volumes of water were removed from each well. <br /> ,y <br /> ENG:1024/072390 i <br />