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Mr.Michael Infurna,SJCEHD April 7,2006 <br /> Well Installation Work Plan <br /> Palisades Station No. 835, Stockton,CA <br /> Page 6 <br /> • Collect soil samples for lithologic comparison and chemical analysis. <br /> • Develop, sample, and survey the newly installed wells. <br /> Rationale <br /> Locations of the proposed well borings are provided on Figure 2 and/or Figure 3. The <br /> proposed well depths and screening intervals are summarized in the table below. The <br /> actual well construction may be appropriately modified based on soil conditions <br /> encountered at the time of the investigation. <br /> WELL IDENTIFICATION SCREENING INTERVAL CONCDUCTOR CASING <br /> INTERVAL <br /> MW-11 5'-20' none <br /> MW-12 38'-48' 0'-30' <br /> MW-13 35'-45' 0'-29' <br /> MW-14 20'-30' 0'-16' <br /> MW-15 5'-25' none <br /> MW-16 5'-25' none <br /> MW-17 5'-20' none <br /> MW-18 35'-45' 0'-29' <br /> MW-19 35'-45' 0'-29' <br /> MW-20 5'-20' none <br /> MW-21 36'-46' 0'-30' <br /> During the 2005 CPT investigation,relatively high concentrations of MTBE and TBA were <br /> reported in shallow groundwater samples collected from boring CPT-2 (3,400 micrograms <br /> per liter [µg/L] and 270,000 gg/L, respectively) and boring CPT-3 (1,800µg/L and <br /> 130,000 µg/L, respectively). The area occupied by borings CPT-2 and CPT-3 is generally <br /> downgradient of the former UST area and eastern pump island, however a groundwater <br /> KAUSA Gasoline\0835\Work PlanApalisades835 workplan2006.doc STRATUS <br />