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{ <br /> 2. 1 Geologic Conditions <br /> This section is unchanged from the Work Plan dated 1 August 2006. <br /> 2.2 Hydrogeologic Conditions <br /> I! This section is unchanged from the Work Plan dated 1 August 2006 . <br /> 3.0 PURPOSE OF INVESTIGATION � �) t ��y r fllvt <br /> Previous work at the site involved installation of four groundwater monitoring wells and <br /> six bore holes, all advanced to 50 ft . bsg, to investigate possible contamination from <br /> underground diesel and waste oil storage tanks. Contamination from these USTs, as <br /> evidenced by groundwater samples from on-site wells MW- 1, MW-2 and MW-3 , has <br /> dropped to relatively minor levels and continues to decline. MW-3 has been free of <br /> �u <br /> contamination since M ch 2002. MW-4, just off the eastern edge of the property, <br /> 4� EPB ) y LUA) <k7 „ <br /> evidenced contamination from gasoline, BTEX and oxygenates. Contamination levels <br /> have decreased somewhat, but BTEX and 1 ,2 DCA are consistently above the California <br /> primary maximum contaminant levels for drinking water. The primary focus of the <br /> proposed investigation is to investigate the vertical extent of contamination from the - <br />'' USTs, and the lateral and vertical extent of contamination from gasoline, BTEX and <br /> oxygenates. <br /> Advanced GeoEnvironmental, Inc. (AGE), conducted an extensive investigation of the <br /> Pacific Pride site immediately south of California Tank Lines, using cone penetrometer <br /> testing (CPT) to a depth of 125 ft. bsg. The proposed investigation at California Tank <br /> Lines will also use CPT to 125 ft. bsg. This will allow developing sections using <br /> lithology from both sites, and may provide greater insight into contaminant pathways <br /> affecting the sites . <br />' i <br /> 4.0 DISCUSSION <br /> Proposed boring locations are shown on Figure 3 . A total of four CPT borings, one west <br /> of MW-2, one on the sidewalk east ofMW-2 and north of MW-4, one west of MW- 1, <br /> and one on the east side of S . El Dorado street, east of MW-4, will be advanced. Soil <br /> and/or water samples will be taken adjacent to each of the four CPT borings, and adjacent Yb P$ <br /> 3 <br />