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FA MR, <br /> To obtain data on the vertical extent of the compound presence, <br /> WE5TON on the behalf of Laura Scudders, Inc. , proposer to install <br /> a single borehole, utilizing a hollow stem auger, in the center of <br /> the Tank T-2 area as shown on Figure 5. This borehole will extend <br /> vertically to first groundwater, which for this site is estimated <br /> to be 60' beneath the ground surface (BGS) . <br /> This borehole will be lithoiogically logged at 5' intervals <br /> starting at a depth of 20' SGS. No logging will be conducted above <br /> 20' due to this strata being composed of non-native backfill <br /> material. The borehole will he lodged by an on-site geologist <br /> utilizing a brass tube lined California modified split spoon <br /> sampler to collect the lithologic samples. <br /> in addition to the borehole logging, soil samples will be collect Z� <br /> for chemical analysis at 5' intervals starting at a depth of 5. <br /> These samples will be analyzed for TFH as diesel utilizingEPA <br /> Method 8015 and BTX&E compounds utilizing EPA Method 8020. Samples <br /> for analysis will be collected at the 5' intervals until groundwa- <br /> ter in encountered. The brass tubes will be sealed with teflon <br /> liners and plastic end caps. The end caps will be secured <br /> utilizing plastic tape. The tubes will be labeled according to <br /> depth and delivered with appropriate chain of custody documents to <br /> the laboratory. During the transition period, the samples will be <br /> stored on ice in a cooler. All sampling activities will be logged <br /> by on-site WESTON personnel. <br /> Upon encountering groundwater, the borehole will be extended an <br /> additional 5' into the water bearing zone. A clear teflon bailer <br /> will then be utilized to collect a water sample from inside the <br /> hollow stem augers. The water retrieved'within the bailer will be <br /> examined for any signs of floating product. A water sample will <br /> then be collected for analysis for total petroleum hydrocarbons as <br /> diesel. After collecting this sample, the auger annulus will be <br /> purged, utilizing the bailer, an equivalent of 3 standing water <br /> - volumes at which time a sample will be collected for analysis for <br /> BTX&E compounds utilizing EPA Method 602. <br /> collecting water samples from within the auger string is a time <br /> saving water screening technique which provides an indication of <br /> the water quality. The samples should not be considered as <br /> definitive as those ccilected from an actual groundwater monitoring <br /> T well. <br /> The water samples will be collected in EPA approved sample <br /> containers. The samples will be labeled appropriately and <br /> delivered to the laboratory accompanied with appropriate chain of <br /> custody forms. During the transition period, the samples will be <br /> stored on ice in a cooler. <br /> -- - ----- ,_r - -All-samples-will_-lie analyzed-by the-WESTON Analytic's laboratory in <br /> Stockton, california, which is California State -certifiedo <br /> perform the analyses required for the project. rased on 'the <br /> results of the soils and water samples, the need for additional <br /> site investigation/remediation work will be evaZrated. <br /> - 9 - <br />