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PUBLIC HEALTH SERVICES oPau±N c <br /> SAN JOAQUIN COUNTY <br /> JOGI KHANNA bl.D., .P.H. <br /> Health Officer <br /> P.O. Box 2009 (1601 East Hazelton Avenue) Stockton, California 95201 c'�oRN <br /> (209) 468-3400 <br /> NEAR 12 1991 � <br /> JOHN DIECKMAN, EXECUTOR <br /> MD AND MRN TRUSTS <br /> 500 AIRPORT BLVD STE 220 <br /> BURLINGAME CA 94010 <br /> RE: System 99 IN REPLY REFER TO SITE CODE: 1275 <br /> 601 S. Ventura <br /> Stockton <br /> Public Health Services, Environmental Health Division (PH /EHD) has reviewed the Problem Assessment <br /> Report and the most recent Quarterly Report dated January 9, 1991 and has the following comments: <br /> 1. Benzene levels of 7.3 ppb and 4.6 ppb detected in MW-1 during the August and November <br /> rounds of sampling respectively are of great concern. The hypotheses that the reduction <br /> in benzene levels,between quarterly samplings,being as a result of natural biodegradation, <br /> is interesting. PHS/EHD is concerned that a contaminates may instead be moving off-site <br /> or retained in the soil as the depth to groundwater fluctuates. <br /> 2. In order to move quickly and better deterin a the groundwater conditions with respect to <br /> the benzene levels, groundwater depths, d possible tidal influences on groundwater <br /> gradient, PHS/EHD is requesting monthlymonitoring for a minimum of one quarter. <br /> 3. During the fact finding outlined above, HS/EHD also requests the preparation and <br /> submission of alternatives for remediation ther than natural biodegradation. <br /> If you have any questions, contact Steven Schneider, REHS, of my staff at (209)468-3441. <br /> Jogi Khanna, M. ., M.P.H. <br /> Health Offic <br /> rie A. Cotulla, RENS, Program Manager <br /> nvironmental Health Division <br /> LAC/SS:nr <br /> c: WaterWork Corp. - Nora H. Kataoka <br /> 1710 Main Street, Escalon, CA 95320 <br /> A Division of San Joaquin County Healt Care Services <br />