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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> 304 East Weber Avenue, Third Floor cart Bergman,R.E.H.S.Director Mike Huggins,R.E.H.S.,R.D.I. <br /> - "Y- <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> • cq.. :.��P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �tcoa Laurie A.Corolla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S.. <br /> OCT 212002 <br /> GEORGE AND MEI TERANISHI <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: GEORGES SERVICE Site Code: 1550 <br /> 1600 DURHAM FERRY RD <br /> TRACY CA 95376 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Additional Soil and Groundwater Investigation, dated 20 August 2002, prepared <br /> by Geological Technics, Inc. <br /> The work plan proposes to: <br /> • Install three short-screened ground water monitoring wells, from 32.5 to <br /> 35 feet below surface grade (bsg) to assess a laterally continuous sand <br /> that may act as contaminant migration pathway near the former UST pit, <br /> near the on-site building, and near two down-gradient domestic wells; <br /> • Install one deeper screened well from 45 to 47.5 feet bsg near the tank pit <br /> and the on-site building to further assess a deeper thick sand unit; <br /> • Collect bioremediation parameters during two monitoring events from 15 <br /> wells to demonstrate operation of intrinsic bioremediation on the site as a <br /> portion of future closure consideration; and <br /> • Reduce the monitoring frequency from quarterly to annually for monitoring <br /> wells MW-105, MW-107 and MW-202. <br /> Bioremediation parameters purposed to be collected include measurements or <br /> analysis for nitrates, total iron, sulfate, alkalinity, dissolved oxygen, temperature, <br /> pH, redox potential and conductivity. Up to 8 soil samples from boring MW-106 <br /> and MW-201 will be analyzed for TPH-g by EPA Method 8015M and for BTEX <br /> and MTBE by EPA Method 8020. One sample per boring will be analyzed for the <br /> five fuel oxygenates by EPA Method 8260. Ground water samples collected <br /> during monitoring events will be analyzed by equivalent methods. If MTBE is the <br /> only fuel oxygenate detected, EPA Method 602 will be used for the analysis for <br /> future events for the analyte. <br />