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CAMBRIA <br /> event These results will be submitted under separate cover Analyses for 1,2-dichloroethane <br /> (1,2-DCA) and ethylene dibromide (EDB) were also added to the sampling protocol All wells <br /> will be analyzed quarterly for TPHg, BTEX, MTBE, 1,2-DCA and EDS The wells will be <br /> analyzed annually (in the third quarter)for fuel oxygenates <br /> Wellhead Survey Achvitaes Following monrtonng well installation, a licensed surveyor will <br /> survey wellhead elevations relative to mean sea level and the latitude and longitude of each well <br /> location <br /> Interim Remediation. Cambria recommends implementing interim remediation in the vicinity of <br /> the former UST pit Cambria recommends conducting a dual-phase extraction (DPE) test This <br /> involves simultaneously extracting groundwater and soil vapors Groundwater extraction is <br /> implemented to dewater the formation to a target elevation, while soil vapor extraction removes <br /> hydrocarbon-bearing vapors from that zone Cambria will conduct a short-term (24-hour) DPE <br /> test, using existing SVE well VEW-2 If warranted by the 24-hour test data, Cambria will extend <br /> the testing period up to five days to collect additional data and maximize mass removal Cambria <br /> may also concurrently conduct an SVE test using existing SVE well VEW-1, which is currently <br /> screened above the water table <br /> Report Preparation Following the receipt of analytical results from the laboratory, Cambria will <br /> prepare a written report which will include field procedures, laboratory results, boring logs, and <br /> conclusions <br /> The scope of work described in this work plan will be performed under the supervision of a <br /> registered geologist <br /> CHROMATOGRAM SUBMITTAL <br /> As requested, Cambria is submitting the chromatograms from the first quarter 2003 sampling <br /> event for all wells (Appendix B) for your review Shell is very interested in your evaluation of <br /> the attached chromatograms <br /> SCHEDULE <br /> Cambria is prepared to implement the well installations upon written approval of this work plan <br /> by SJCEFfD and receipt of an appropriate drilling permit and access agreement Cambrid is <br /> • prepared to implement the DPE test upon written approval of this work plan by SJCEHD <br /> 0854 6 <br />