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ENVIRONMENTAL HEALTH DEPARTMENT <br /> opt. SAN JOAQU N COUNTY Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> i Director Mike Huggins,R.E.H.S.,R.D.I. <br /> •'k'4v y <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> p•�::; Telephone: 0468-3420 Margaret Lagorio,R.E.H.S.Pro ram Manager <br /> Qci o'R°' Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> DAVID PETERS / RAMONA BOOZE MAY 2,2 2002 <br /> TED PETERS TRUCKING <br /> PO BOX 91957 <br /> LONG BEACH, CA 90809-1957 <br /> RE: TED PETERS TRUCKING CO,INC SITE CODE: 1427 <br /> 1985 YOSEMITE <br /> MANTECA CA 95336 <br /> San Joaquin County Envirorunental Health Department(EHD, has received Groundwater Monitoring Report V <br /> Quarter 2002 dated 141ay 8,2002 prepared by Geological Technics,Inc(GTI). Analytical results of the <br /> groundwater samples obtained in January 2002 from the three monitoring wells were non-detect for all <br /> chemicals tested. This monitoring event was the second of the three consecutive quarters of sampling EHD <br /> required by letter dated June 25,2001. <br /> In a meeting on-May 1,2002,Central Valley Regional NVater Quality Control Board(RWQCB)agreed that the <br /> contamination at the site appears to be defined at this time. RWQCB also agreed that another quarter of <br /> sampling may not be necessary and the site should be considered for closure. <br /> Under the direction of RWQCB,5 monitoring wells(MW-4 thru MW-8)have been installed at the north side <br /> of the property to investigate the extent of the aboveground storage tank-related diesel contamination. <br /> Analytical results of the groundwater sample from MW-7,which is located about 300 feet from the <br /> underground storage tanks,were 2,900 micrograms per liter(�g/1)in Total Petroleum Hydrocarbons as <br /> gasoline,and 65 pg/l of benzene according to the Quarter � Mfing � or <br /> yrepfo ' 2002f <br /> Aboveground Storage Tank Site dated April 24,2002. In a telephone conversation on Olay 1,2002,GTI expressed <br /> that the presence of aromatic hydrocarbon compounds in groundwater at the north end of the property may <br /> be related to the underground tank release. GTI requested EHD not to submit the site for closure until that <br /> could be verified. <br /> It is incumbent upon you to provide evidence that the groundwater contamination observed at the northern <br /> part of the property is related to the underground tank sourceII. A site conceptual model that can account for all <br /> the available data and demonstrates a UST origin for the contaminants encountered in',MW-7 should be <br /> prepared. EHD agreed that additional investigation to detern ne the hydrogel4cal condition and potentially <br /> deeper presence of contamination in groundwater may be re4uired. However,any proposal for additional <br /> investigative work not requested by RHD must be justified. Ali unjustified proposal may be rejected by the <br /> Clean Up Fund for reimbursement. A site conceptual model may provide the required justification. <br /> EHD also agreed with GTI to conduct the last quarterly sampling in May 2002. if EHD does not receive an <br /> investigative work proposal by August 20,2002,the site may be submitted for closure. <br /> Donna Heran,REHS,Director <br /> Environmental Health Division <br /> Won RENS V Nuel C.Henderson,Jr.,RG <br /> Jeffrey g, <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> Cc: CRWQCB,Central Valley Region—Marty Hartzell <br /> Cc: Geological'Technics,Inc.--Ray Kablanow <br />