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PIJPUBLIC tEALTH SER)CES PpU,N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> Cq a`P <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • StocktonVC <br /> <fFaa <br /> 209/468-3420 F <br /> JEFF GRANBERRY MAILED MAY 0 91996 <br /> SHELL OIL <br /> PO BOX 5278 <br /> CONCORD CA 94520 <br /> Re: Shell Service Station Site Code: 1223 <br /> 6131 Pacific Ave <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed <br /> review of the "Quarterly Monitoring Report - First Quarter 1996" dated April 26, 1996 and the "Work <br /> Plan" dated May 1, 1996, both of which were prepared by Enviros. PHS/EHD has the following <br /> comments for your consideration. <br /> The quarterly report included the results of the February 28, 1996 groundwater sampling event that <br /> was performed by Blaine Tech Services. Depth to water measurements ranged from 44.32' in MW2 <br /> to 45.60' in MW3. The three existing monitoring wells are all constructed similarly with screened <br /> intervals between 45' and 65'. Please note that based on observations from nearby sites that it is <br /> anticipated that the existing wells are screened below first water. The Blaine Tech field notes were not <br /> included in the report. Please submit the field notes from the February 28, 1996 sampling event. <br /> The work plan proposed to sample three, possibly four geoprobe borings to groundwater. As PHS/EHD <br /> has requested on a number of occasions beginning November 26, 1991 and which was agreed upon <br /> during the February 2, 1996 meeting, that the groundwater plume be defined with monitoring wells. <br /> Rather than continue to collect grab groundwater samples, monitoring wells, from which reproducible <br /> analytical results can be obtained, must be installed off site to define the extent of the groundwater <br /> contamination plume. An additional monitoring well southwest of MW3 will likely be required as well. <br /> Furthermore, it was PHS/EHD's understanding that additional investigation in the area of the former <br /> dispenser islands would be proposed to further define the extent of soil contamination evidenced during <br /> the tank removal sampling. <br /> Please submit permit applications and encroachment agreements for the field work to be implemented. <br /> Also, please submit a brief addendum addressing PHS/EHD's comments. It is PHS/EHD's intention that <br /> this be the last field activity to complete the investigation necessary to evaluate remedial alternatives. <br /> If you have any questions please contact Mary Meays at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Mary Meays, S nior REHS `Marga t Lagorio, RS ^ <br /> Site Mitigation Unit Lead Senior <br /> MM/6131 PAC <br /> cc: Elizabeth Thayer, CVRWQCB <br /> cc: Diane Lundquist, Enviros <br /> A Division of San Joaquin County Health Care Services <br />