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OpqPUBLrC HEALTH SERVICESulfq_�. :� .o <br /> •G <br /> SAN JOAQUIN COUNTY ' <br /> e: : s <br /> JOGI KHANNA M.D.,M.P.H. .'. <br /> Heakh Officer <br /> P.O. Sox 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209)46&3400 <br /> f� <br /> PF <br /> STEPHEN POA <br /> CC . Dy <br /> MOBIL OIL CORPORATION <br /> 3800 WEST ALAMEDA AVE STE 2000 APRT 7192 <br /> BURBANK CA 91505-4331 <br /> Re: Former Mobil Bulk Plant SITE CODE: 1968 <br /> 500 East Grant Line Road <br /> Tracy, CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has completed review of the "Quarterly Ground <br /> Water Monitoring and Sampling Report" dated March 26, 1992 <br /> prepared by Alton Geoscience. PHS/EHD has the following <br /> comments. <br /> PHS/EHD was not notified of the February 21, 1992 sampling event. <br /> Please be informed that site inspections of sampling events are <br /> an important aspect of local regulatory oversight. For future <br /> reference, please notify Mary Meays at the number below, 48 hours <br /> prior to any site activity. <br /> The Water Sampling Field Survey data sheets, included with the <br /> monitoring report, indicated that temperature, pH, or <br /> conductivity parameters were not measured during purging. <br /> Temperature, pH, and conductivity parameters are measured to <br /> verify that groundwater has stabilized after well volumes are <br /> purged prior to sampling. During future sampling events these <br /> parameters should be measured and recorded. <br /> PHS/EHD was notified and was present during the March 26, 1992 <br /> pump-out of AW-3 . Obvious petroleum odors were observed as <br /> approximately 200 gallons of groundwater were removed during the <br /> pump-out. <br /> In the circumstances described above, PHS/EHD questions the <br /> validity of the February 21, 1992 sample results which reported <br /> no detectable petroleum contaminates in any of the monitoring <br /> wells. <br /> Additionally, purge water disposal documentation was not included <br /> with the monitoring report. Please include purge water disposal <br /> documentation with future monitoring reports. <br /> A Division of San Joaquin Counry Health Care Services �� <br />