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x <br /> INTERNATIONAL TECHNOLOGY CORPORATION <br /> from each well were analyzed by the following methods: <br /> • Modified EPA Methods 8015 and 80?`' ` <br /> - Total Petroleum Hydrocarbons calculated as gasoline <br /> - Benzene, Toluene, Ethyl Benzene, and total Xylenes (BTEX) <br /> r� Sample from MW-4, adjacent to the waste oil and motor oil tank field, was also <br /> analyzed for the following: <br /> • Modified EPA Method 8015 <br /> - Total Petroleum Hydrocarbons calculated as diesel <br /> • Standard Methods 503E <br /> Oil and Grease <br /> . EPA Methods 601 and 8010 <br /> - Halocarbons <br /> x <br /> +-, Monitoring wells were constructed using four.in_h diameter, schedule 40, <br /> threaded, PVC casing and schedule 40, threaded, PVC screen. Screen size used <br /> is shown in the well logs (Appendix B) Ear; 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 Lonestar sand. The gravel pack extended <br /> from the base of the screen to three foot above the screen. A three-foot <br /> 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 encas:d <br /> ;-- with a twelve-inch, flush mount, watertight locking Christy box. Each well <br /> was fitted with a water proof locking cap and labeled. See boring logs in <br /> Appendix 8 for well construction details. <br /> �. The elevation of the wells were surveyed by Wong Engineer� � Inc of Stockton, <br /> s California. The elevations were related to a USGS datum. `Elevation data is <br /> contained in Table 1, <br /> f. <br /> On 30-April-1990, the wells were developed by hand bailing and surging until <br /> pH, conductivity, temperature, and turbidity measurements stabilized. <br /> Approximately .en .well volumes of water were removed from each well. <br /> 3 <br /> 1:ENG:7024/072390 . <br />