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i <br /> rw � <br /> for chemical analyses.ses. c 1 <br /> of samples were also sub:aitted to <br /> :.a <br /> Nelson Laboratories, 5tocktrn for train size analys.s. <br /> 4 . 1 .2 Phase <br /> During Phase II, monitor well installation techniques were <br /> i <br /> modified Iron those previously used. A B-53 Auger rig was <br /> _$ used to drill two 7-inch diameter boreholes, each completed <br /> t through an approximate depth Cf 55 feet. <br /> [A <br /> Soil samples were collected at 5 ft intervals <br /> beginning at 5 <br /> feet, using a hollow sten auger. Upon retrieval, soil samples <br /> ( were described by an =Sz field geologist for litholo <br /> color. prior to _a," le s gY and <br /> r f� p submission for chemical and physical <br /> analyses, soil samples were screened with a photoionization <br /> detector (PID) to determ-,ne the presence of volatile organic <br /> compounds (VOCs ) . The PID was calibrated as per manufacturers <br /> directions - <br /> , but provided no evidence of strata warranting <br /> additional laboratory analyses. Subsamples were therefore <br /> submitted for <br /> laboratory analyses only for those collected at <br /> }}, both 30 and 35 feet, based on recommendations of the ESE field <br /> f. <br /> geologist, general concordance with Anheuser-Busch 's field <br /> representative, and interpretation of County Health <br /> requirements. Scil samples were iced, and delivered to the <br /> laboratory within, 24 hours of sample collection. <br /> 1� <br /> Each borehole was Completed as a 2-inch diameter ground water <br /> p ,monitor well, as shown previously in Figure 4-2, and described <br /> in Table 4-1 . Decisions to screen discrete intervals were <br /> A", based primarily County Health 's requirement to sr.r.een <br /> approximately 20 feet of the +i <br /> peer saturated zone and provide <br /> some additional screening to account for possible groundwater <br /> is fluctuations. Unlike- during Phase I, PID we readings <br /> close to amb.{R 9 were all. <br /> l <br /> t , nt levels, and provided little input in the <br /> decision making process. <br /> t al <br /> f 4-b <br /> �:a <br />