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Chevron 9-4054 page 2 <br /> 2103 Country Club Blvd., Stockton. <br /> not contain concentrations of chemical constituents in excess of the maximum <br /> concentration levels (MCLS) specified in the provisions of Title 22 of the California Code <br /> of Regulations, Section 64444.5." Your CAP groundwater clean up goals/objectives <br /> must conform to MCLs. <br /> After a diligent effort has been made by continued SVE/AS remedial activities and the <br /> concentrations of petroleum in the groundwater have not reached the MCLS, PHS-EHD <br /> will evaluate conclusions reached by your consultant as to why these levels are <br /> unobtainable. <br /> The groundwater gradient direction has shifted to the south at this site as noted in the <br /> most recent Quarterly Monitoring Report, "2ntl Quarter 1998". On May 20, 1998 <br /> monitoring wells #8 and #5 have recorded the highest petroleum concentrations in the <br /> history of these wells. If this gradient direction continues, the site does not have a <br /> down-gradient monitoring well that delineates the groundwater petroleum plume. <br /> Additional monitoring wells may be required. In addition, only two of the twelve <br /> monitoring wells for this site have screened intervals that are not "drowned" by the <br /> current groundwater level at this site. If this "drowned" condition continues, additional <br /> monitoring wells will be required and installed so that the depth to groundwater falls <br /> within the screened interval of the monitoring well casing. <br /> The CAP is approved with the above noted conditions. Please submit a time <br /> schedule by September 21, 1998 that shows the dates all site activities will begin <br /> and end. You may contact Michael Infurna at (209) 468-3454 if you have any <br /> questions or wish to schedule a field inspection. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Michael J. Infurna Jr., Senior REHS Margaret Lagono, RE S <br /> LOP/Site Mitigation Unit IV Supervisor <br /> MI/ <br /> c: CVRWQCB - M. List. <br /> c: Terra Vac - Stephen H. Alton, 1651 Alvarado St., San Leandro, 94577. <br /> C: SWRCB CUF - Teresa Trinh <br />