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PUBLIC HEAL., ,-, SERVICES ° ado <br /> SAN JOAQUIN COUNTY <br /> JOGi KHA,NNA MD.,MT.H.' <br /> Health Officer a <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 4683400 4. . <br /> DAN KIRKL <br /> SHELL OIL COMPANY <br /> P O BOX 5278MAY 5 11 ? <br /> CONCORD CA 94520-9998 <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 Division (PHS/EHD) has reviewed the <br /> "Quarterly Groundwater Monitoring Report" dated April 9, 1993 and prepared by Aegis Environmental. <br /> PHS/EHD has the following comments for your consideration. <br /> The request to monitor and sample monitoring wells annually is denied. 'The monitoring wells are currently <br /> monitored to determine groundwater gradient on a quarterly basis. The downgradieni well,M`1V2,is sampled <br /> quarterly and MW1 and MW3 are sampled semi-annually. <br /> Significant soil contamination which remains poses.a threat to groundwater. <br /> The monitoring of all wells should continue on a quarterly basis. The sampling frequency of all wells may be <br /> reduced to semi-annually. Quarterly reporting, which is recognized as a.minimum:reporting requirement, <br /> should continue. The next quarterly report should be submitted by July 15, 1993. The next groundwater <br /> sampling event should be scheduled by,August 19, 1993. <br /> 4. Please insure that PHS/EHD is notified prior to sampling events. PHS/EHD inspection of sampling events <br /> is an important aspect of local-regulatory oversight. <br /> If you have any comments; questions or to schedule a site'inspection, please contact Mary Ways, Senior <br /> REHS, of my staff at.(209) 468-0337: <br /> Jogi Khanna, 1v ,D,M.P,H: <br /> Health Officet� <br /> r . <br /> Laurie A. Cotulla, REHS, Program Manager <br /> I, ,Environmental Health Division <br /> / LAC/MM:lb <br /> c: Elizabeth Thayer, CVRWQCB <br /> c: Craig Robertson, AegisEnvironmental <br /> A Division or"an Joaquin County Health care services <br /> r <br />