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w <br /> P <br /> i <br /> H3Td1n9 Lawson Assecimtes <br /> f . <br /> 6. gill and sample an additional boring between MW-1 and MW-5 (see <br /> Plate 1) to a depth of approximately 5 feet to help evaluate the <br /> lateral extent of gasoline in soil in this area. <br /> 7. Develop Well MN-5 and purge Wells Mid-1 through MW-4 by bailing; <br /> accurately measure water levels; and collect water samples from each <br /> well <br /> 8. Analyze two soil samples for total petroleum hydrocarbons (TFH) and <br /> one water sample from each well for benzene, toluene, and xylene <br /> ., (BTX), <br /> The scope of work was authorized by your letter dated February 26, 1987. <br /> FIELD OPERATIONS <br /> At the request of 7-Eleven, ILA applied for and obtained a well instal-- <br /> lation permit from the SJLHD. Drilling operations were subcontracted to <br /> Datum Exploration, Inc., which completed drilling and sampling operations on <br /> March 6, 1987. MW-5 was drilled using 8-inch-diameter hollow-stem augers <br /> ;..,k f <br /> and sampled with a 2.45-inch-diameter Sprague and Henwood (S&H) sampler to a. f <br /> Idepth of 20 feet. Samples were retained in brass tubes 6 inches long, <br /> screened for certain organic vapors in the field with a Johnson Gas Tech <br /> f Model 1314, and sealed on each end with aluminum foil and tape. Plastic <br /> caps were then placed over the ends, and the samples were placed in a cooled <br /> ice chast. Before and after each sampling, all sampling equipment was <br /> - _ thoroughly cleaned Ina solution of Alconox and tap water, then rinsed in - <br /> distilled water. Augers were steam cleaned prior to use and between borings <br /> in order to avoid cross-contamination. All cuttings from drilling opera- <br /> tions were stored in 55-Ballon drums and left on site. <br /> NM <br /> � i <br /> C , <br /> c <br />