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k <br /> 4 <br /> Kennedy/Jenks/Chilton <br /> Mr. Charles Whitworth <br /> Cal -Farm Supply <br /> 14 July 1989 <br /> Page 4 <br /> tanks. However, during the field investigation, only one tank was positively <br /> identified based on typical tank features such as a vent pipe, filler pipe, <br /> and dispensing pump. There was no evidence of the reported second tank. <br /> _ Monitoring well MW-1 was drilled near the known tank and the other three wells <br /> (MW-2, MW-3, and MW-4) were drilled at the southeast, southwest and northern <br /> portions of the fenced area respectively. Selected soil samples were <br /> collected from all borings for nitrate, TPH, and BXTE analysis. The <br /> approximate location of soil borings and monitoring wells are depicted on <br /> Figure 3. <br /> „ On 12 April 1989 the four monitoring wells installed as part of this <br /> investigation were developed, purged, and sampled. Table 1 presents the <br /> groundwater parameters collected during purging Groundwater samples were <br /> analyzed for nitrate, TPH, and BXTE. <br /> On 6 April 1989, the three storage trailer containers and their contents were <br /> evaluated by two Kennedy/Jenks/Chilton geologists. For reference these <br /> containers are numbered 1, 2, and 3 as shown on Figure 3. The containers were <br /> } opened, visually inspected, and photographed, but the containers were not <br /> entered. <br /> On 9 May 1989, 13 surface soil samples were collected from within the fenced <br /> area of the property. In addition, two wipe samples were taken on two <br /> separate floor areas inside the main warehouse building. The 13 surface soil <br /> samples and two wipe samples were analyzed for a broad range of pesticides and <br /> nitrates. In addition, two of the surface soil samples were analyzed for the <br /> 2,3,7,8-dioxin isomer as a result of tentatively identifying chemicals stored <br /> at the site which have the potential for containing this dioxin isomer. The <br /> `) approximate location of surface samples and wipe samples are shown on Figure <br /> 4. <br /> The details of the drilling and sampling methodology are presented in <br /> Attachment A. <br /> ANALYTICAL PROCEDURES <br /> All surface and wipe samples were analyzed for the following constituents <br /> according to the designated procedures for pesticide or fertilizer analysis- <br /> k <br /> o Carbamate pesticides and urea pesticides: Determined by EPA method <br /> 632 using a methylene chloride extraction followed by a florisil <br /> cleanup. The resultant extract was analyzed by a high pressure <br /> . liquid chromatography (HPLC) process <br /> k <br /> i# <br /> i <br />