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Ric Notini <br /> Page 2 <br /> Thank you for providing tide table information for the date of sampling. Please continue <br /> efforts to measure the groundwater elevation in the monitoring wells within one hour <br /> monitoring intervals to provide reliable data for the determination of groundwater <br /> gradient. <br /> Please prepare a site map locating former tanks and include all monitoring wells for <br /> submittal with the next quarterly report. <br /> Since EDB and organic lead contamination have not been detected in samples and total <br /> Iead levels detected were below "Maximum Contaminant Levels!', continued analysis of <br /> these contaminants will be unnecessary at this time. However, prior to site certification <br /> analysis of total lead may be required. <br /> PHS/EHD agrees that additional quarterly monitoring will provide necessary information <br /> for the preparation of a problem assessment report and for the purpose of evaluating <br /> remedial alternatives. Two quarters of monitoring should provide adequate confirmation <br /> of the extent of groundwater contamination and verify gradient. Please submit a problem <br /> assessment report proposing soil and groundwater remedial alternatives by <br /> November 15, 1992. Also, note that residual soil contamination remains a source of <br /> continued contamination of groundwater. <br /> Please continue to notify PHS/EHD 48 hour prior to sampling. If you have any questions <br /> or comments, please contact Mary Meays, REHS, of my staff at (209) 468-0337. <br /> Jogi Khanna, M.D., M.P.H. <br /> Health O ce <br /> • z <br /> �ti3O <br /> urie A. Cotulla, RENS, Program Manager <br /> Environmental Health Division <br /> LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Bruce Pfaff, ERM-West <br />