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PUBLIC HEALTH SERVICES Q�,N <br /> SAN JOAQUIN COUNTY <br /> 1 ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D , M.P.H., Acting Health Officer - <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 9520 -fl-3$8',%�t --i. r'cr'Fa:0 <br /> 209/468-3420 � �', <br /> JOHN MARGOWSKI <br /> WICKLAND OIL COMPANY FEB 0 3 <br /> P O BOX 13648 <br /> SACRAMENTO CA 95853-4648 <br /> RE Former Regal Station SITE COBE. 1211 <br /> 6425 Pacific Avenue <br /> Stockton CA 95207 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has <br /> completed review of the Western Geo-Engineers (WEGE) "Workplan to Drill and Sample Borings to <br /> Characterize the Remaining Hydrocarbons and the Effectiveness of the Vapor Recovery System <br /> dated November 27, 1996 and "July - September 1996 Update Status Quarterly Sampling Report <br /> #45" dated November 7, 1996 PHS/EHD has the following comments for your response <br /> The work plan proposed to drill three soil borings The total depth of the borings should be greater <br /> than 50 feet below ground surface, since significant soil contamination was evidenced previously of <br /> up to 11,000 ppm TPH-gasoline and 73 ppm benzene at 50 feet below ground surface (B-3) and up <br /> to 30 ppm TPH-gasoline and 31 ppm benzene at 65 feet below ground surface (MW3) Also, the <br /> depth to water beneath the site has changed significantly from as deep as 56 72 feet in Sept 1992 <br /> to 37 9 feet in June 1996 in MW2 These initial soil borings will begin the characterization of the <br /> remaining plume Please submit a PHS/EHD permit application and $89 fee along with an access <br /> agreement from Lincoln Properties to perform the proposed field work <br /> Also, PHS/EHD strongly suggests that tentative plans be made for three additional soil borings, if <br /> field conditions warrant further soil definition These additional soil borings' placement should be <br /> based on field conditions and site accessibility, since there are existing underground storage tanks <br /> in operation Analysis of site specific parameters which characterize the ability of the <br /> contaminants to migrate in the subsurface should also be included Please proceed with efforts to <br /> obtain pre-approval from the cleanup fund <br /> In review of the latest groundwater results obtained from samples collected on September 19, <br /> 1996, PHS/EHD has concerns that the bioventing of MW8 has not sufficiently controlled the <br /> groundwater contaminant plume's migrations Additional plume control measures may be <br /> necessary The most downgradient well, MW12 which is located approximately 300 feet from the <br /> former tank area, evidenced MTBE contamination of up to 130 ppb <br /> If you have any questions or comments, please do not hesitate to contact me at (209) 468-0337 <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Mary Meays, Seni r REHS Margare Lagorio, RENS) <br /> Site Mitigation Unit Supervisor <br /> MM16425PACI <br /> cy Elizabeth Thayer, CVRWQCS c Wendy Cohen, CVRWQCB <br /> �tC George Converse, WEGE c Wilbur Smith, Lincoln Properties <br /> A Dit»ion of San Joaquin County Health Care Sen tces <br />