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Work Plan for'Additional Site Assessment <br /> and Interim Remediation/Feasibility Testing <br /> ARCO Facility No.5469 <br /> Stockton,California <br /> Page I I <br /> site plan, site geology, soil boring logs, certified an reports, findings, and <br /> conclusions of the assessment. <br /> Delta Will,-prepare and. submit a status. report following;the first week of C-Sparge'"'` <br /> operation incorporating the details of flow rates, injection pressures, monitoring parameters <br /> and frequency of sampling. In addition, Delta will"prepare and submit status reports 60 <br /> days and 120 days after system start up. ,.Delta.will also prepare and submit a remedial <br /> action plan at the end of the interim rernediation/feasibilityl testing, evaluating feasible <br /> remedial alternatives with recommendations for final remediation. I <br /> Task 10: Quarterly Groundwater Monitoring <br /> The newly, installed groundwater monitoring wells (MW-11 through MW-13) will be <br /> incorporated into the quarterly groundwater monitoring program for the site. Sampling <br /> activities.will include measurement of groundwater elevations;water temperature, pH, and <br /> electrical conductivity, Groundwater samples will be collected from the monitoring wells <br /> s ` <br /> and forwarded to astate-certified analyticallaboratory for chemical analysis. Samples will ` <br /> be analyzed for TPHG using USEPA Method 8015: DHS/LUF, and for BTEX, MTBE, <br /> ETBE, DIPS, TAME, TBA, and 1,2 DCA using USEPA Method 8260. <br /> SCHEDULE <br /> Following approval of the work plan, Delta''will arrange for offsite access and will submit a <br /> well permit,application package to PHS/EHD.• It will!Iikely`take 3 to 4 weeks for a drilling <br /> contractor to become available once access has been granted. The CPT boring <br /> advancement, monitoring well, and C-Sparge well .drilling activities will require <br /> approximately 8 working days to be completed: The results of the.investigation will be <br /> reported within six weeks of receiving the'soil and groundwater analytical results. The C- <br /> Sparge"' design drawings and specifications will be developed within 4 weeks .after the <br /> drilling activities are completed. Delta estimates that the permitting, contractor selection, <br /> construction, and .installation will be completed within 4 weeks after. the plans and <br /> specifications are finalized. i <br /> P:�ARCO\54691Work Plan15469 wrlcpIn 03-2002.doc <br /> i <br /> _ r <br />