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�' HEALTH SE CESPUBL��, r�...� ..�2 <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA N1.1)..\11P 1i <br /> Health Officer eP <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) <br /> • Stockton, California 95201 <br /> (209) 468-3400 <br /> py <br /> KURT MILLER (C(a <br /> SHELL OIL COMPANY JAN 2 91992 <br /> P O BOX 40023 <br /> CONCORD CA 94524 <br /> RE: Hammer Lane Shell Site Code: 1660 <br /> 7910 Lower Sacramento Road <br /> Stockton CA 95210 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed review of the Delta <br /> Environmental Consultants report, Quarterly Monitoring Report - <br /> Fourth Quarter 1991, dated December 20, 1991 with PHS/EHD <br /> comments to follow. <br /> 1. It was agreed during the November 22 , 1991 meeting held <br /> between PHS/EHD, Shell Oil Company, and Delta Environmental <br /> Consultants that the sampling frequency of monitoring wells <br /> MW1 and MW3 could be reduced to semi-annually, however, MW2 <br /> sampling frequency would remain quarterly. This agreement <br /> was based on the evidence that MW2 was the downgradient <br /> well. According to the November 21, 1991 groundwater <br /> elevation measurements, MW1 is currently the downgradient <br /> well. It may be necessary to revise the agreed sampling <br /> frequency, depending on the first quarter 1992 monitoring <br /> results. <br /> 2 . During the November 22, 1991 meetingtit was agreed that a <br /> "Draft Final Remediation Plan" would not be required at this <br /> time. However, monitoring will continue to verify that <br /> groundwater in not impacted by residual contamination. <br /> Since remediation is not scheduled at this time, a <br /> groundwater investigation of the northern dispenser will be <br /> necessary. <br /> Please submit a workplan for the additional groundwater <br /> investigation by April 15, 1992. <br /> 3 . Continue evaluating the possibility of the use of monitoring <br /> wells for vapor extraction as was discussed during the <br /> November 22 , 1991 meeting. <br /> A Division of San Joaquin County Health Care Services <br />