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r <br /> Mr. Harlin Knoll, SJCEHD April 7,2006 <br /> Work Plan for Confirmation Soil Borings Project No. 2007-0065-01 <br /> USA Station No. 65, Lodi,California <br /> Page 4 <br /> CPT-2 in this general area, with these borings extending beyond first encountered <br /> groundwater. Depth discrete groundwater samples will be collected within water bearing <br /> strata, as appropriate, to enable vertical assessment of potential petroleum hydrocarbon <br /> impact to groundwater. This additional data will assist in calculating remaining methyl <br /> tertiary butyl ether (MTBE) concentrations in groundwater, as requested by SJCEHD <br /> personnel in the March 29, 2006 letter. TPHG, benzene, and MTBE concentrations <br /> reported for the first quarter 2006 groundwater sampling event are depicted on Figure 5. <br /> Following completion of the assessment work, the analytical data will be analyzed, and a <br /> recommendation for an appropriate site management strategy will be presented. If <br /> warranted, the data will be used to support a No Further Action Required request for the <br /> site. <br /> SCOPE OF WORK <br /> The objectives of the proposed work are to: <br /> • Evaluate post-remediation concentrations of petroleum hydrocarbons in soil <br /> beneath the site. <br /> • Additionally evaluate dissolved petroleum hydrocarbons in groundwater <br /> downgradient of the site. <br /> To accomplish these objectives, Stratus is proposing the following activities: <br /> • Advance three (3) exploratory soil borings (CB-1 through CB-3) to approximately <br /> 55 feet bgs using hollow stem augers. <br /> • Collect soil samples in 5-foot intervals for lithologic comparison and chemical <br /> analysis during the advancement of borings CB-1 through CB-3. <br /> • Advance two (2) cone penetration test (CPT) borings (CPT-1 and CPT-2) to <br /> approximately 90 feet bgs. <br /> • Collect depth discrete groundwater samples from separate sampling boreholes <br /> advanced immediately adjacent to borings CPT-1 and CPT-2. <br /> The proposed scope of work has been subdivided into tasks 1 through 4. Details are <br /> provided for the activities associated with each task. All geologic work will be conducted <br /> under the direct supervision of a State of California Registered Geologist or Civil <br /> Engineer, and will be conducted in accordance with standards established by the <br /> California Regional Water Quality Control Board (RWQCB, Recommendations for <br /> Preliminary Investigation and Evaluation of Underground Tank Sites, April 2004) and <br /> SJCEHD guidelines. A California-licensed C-57 well driller will perform all soil boring <br /> KAUSA Gasolinel00651Workplanslusa65-boring-cpt-workplan.doc STRATUS <br />