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PUBLIC 4EALTH SEIZ)ICES 'OP�UIN <br /> SAN JOAQUIN COUNTY <br /> r.' <br /> l ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer <br /> 304 E. Weber A_ ve., Third Floor • P. O. Box 388 • Stockton, CA 95201=0388 . FoaN " <br /> 209/468-3420 <br /> JOHN MARGON/SKI <br /> WICKLAND 0I000MPANY FEB 0 3 1997 <br /> P 0 BOX 13648 <br /> SACRAMENTOsICA 95853-4648 <br /> I <br /> RE: Former Regal Station SITE CODE: 1211 <br /> 6425 Pacific Avenue <br /> Stockton CA .95207 <br /> , li <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has j <br /> r <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 f <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 TPHIpsoline 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 199b 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 /> i <br /> I{I � <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. 3 <br /> If you have any'lquestions or comments, please do not hesitate to contact me at (209) 468-0337. 1� <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> `I <br /> - 7 <br /> Mary Meayseays, S HS Margaret Lagorio, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\6425PACI <br /> c: Elizabeth Thayer, CVRWQCB c: Wendy Cohen, CVRWQCB <br /> c: George Converse, WEGE c: Wilbur Smith, Lincoln Properties j <br /> A Division of San Joaquin Counts Health Care Services t <br /> I <br /> if I <br /> y <br />