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s <br /> ENVIRONM 4AqMIALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> 2;• ,—,�� .� Unit Supervisors <br /> Q: ?� Donna K.Heran,R.E.H.S. <br /> W Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S, <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,Wilson, <br /> S.,R.E.H.S. <br /> • o.- Program Manager Douglas W.Wilson,R.E.H.S. <br /> Qri FO.ASZTelephone: {209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> MICHAEL KARVELOT MAR 2 1 2003 <br /> QUIK STOP MARKETS INC <br /> 4567 ENTERPRISE STREET <br /> FREMONT CA 94538 <br /> RE. Quik Stop Station No. 076 SITE CODE 887 <br /> 1030 South Olive Avenue RO: 887 <br /> Stockton, CA 95215 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Results of <br /> Soil and Groundwater Investigation, dated 25 June 2002, and submitted on your behalf <br /> by Horizon Environmental Inc. (Horizon). Petroleum hydrocarbons were detected in <br /> groundwater samples collected from soil borings SB-1, SB-2, and SB-3; soil samples <br /> collected from these three borings had less than detectable concentrations of fuel <br /> components. <br /> EHD does not concur with Horizon's recommendation for"no further action" status for <br /> the subject site, but has determined that further site investigation is necessary to assess <br /> the lateral extent of impacted groundwater in the silty sand encountered at sixty-five feet <br /> below surface grade (bsg). EHD recommends that a minimum of three groundwater <br /> monitoring wells be installed to assess the lateral extent of impacted groundwater. <br /> You are hereby directed to submit a work plan by 28 April 2003 to conduct the necessa <br /> additional site characterization. <br /> Construct monitoring wells at the site to assess the impact to groundwater resulting from <br /> the unauthorized release of fuel hydrocarbons on the site and establish the groundwater <br /> gradient. Monitoring wells should be screened at an interval representative of the <br /> affected groundwater. Groundwater samples should be analyzed quarterly for total <br /> petroleum hydrocarbons (TPH) as gasoline by Environmental Protection Agency(EPA) <br /> method 8015B; TPH as diesel by EPA method 8015B; benzene, toluene, ethylbenzene, <br /> and xylenes (BTEX)by EPA method 8021; and methyl tertiary-butyl ether(MTBE), <br /> tertiary-butyl alcohol (TBA), di-isopropyl ether(DIPE), ethyl tertiary-butyl ether <br /> (ETBE), tertiary-amyl methyl ether(TAME), ethylene dibromide (EDB), 1,2- <br /> dichloroethane (1,2-DCA), ethanol, and methanol, by EPA method 8260B. Quarterly <br /> monitoring should continue until further direction from EHD. <br />