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a <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Donna K.Heran,R.E.H.S. Unit Supen4sors <br /> 46. Director 304 East Weber'Avenue,Third FIoor Carl Borgnjan,R.E.H.S, <br /> Al Olsen,R.E.R.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> •:o Pro rain dlcrna er Douglas W.Nilson,R.E.H.S. <br /> d[; o a` S Telephone: (209) 468-342Q Margaret Lagorio,R.E.H.S. <br /> Laurie A.Cotulla,R.E.H.S. <br /> IPM Program tllanager Fax: (209)464-0138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> MICHAEL KARVELOT <br /> QVIK STOP MARKETS INC FEB 1 200a <br /> 4567 ENTERPRISE STREET <br /> FREMONT CA 94538 <br /> RE: Quik Stop Market No. 132 <br /> 3555 West Hammer Lane <br /> Stockton,California 95209 <br /> San Joaquin County Environmental Health Department(EHD)has reviewed the analytical results for <br /> groundwater samples collected quarterly from the above-referenced site in response to recommendations <br /> by ATC Associates Inc. (ATC)to reduce monitoring frequency and remove several wells from the <br /> monitoring program. EHD approves the removal of monitoring wells MW-3,MW-6, MW-7,and MW-8 <br /> 16-• from the quarterly groundwater sampling program as non-detect results or very low concentration results <br /> have been detected in these wells over the past two years. Please continue the quarterly monitoring of <br /> MW-1R,MW-2,MW-4,MW-5,MW-9,and MW-10 and report these compounds during future quarterly <br /> �,..✓ groundwater monitoring events. <br /> Monitoring Wei 1 Requested Analyses <br /> MW-1R Methyl tertiary-butyl ether(MTBE)by Method 8260B <br /> MW-2 MTBE,tertiary-butyl alcohol (TBA),and tertiary-arnyl <br /> methyl ether(TAME)by Method 8260B <br /> +— MW-4 Total petroleum hydrocarbons as gasoline(THP-g)by <br /> Method 801513,and benzene, toluene, ethyl benzene,and <br /> total xylenes(BTEX)by Method 8021B <br /> MW-5 MTBE,TAME,and TBA by Method 8260B <br /> r <br /> �. MW-9 MTBE by Method 8260B <br /> MW-10 MTBE by Method 8260B <br /> Also continue collecting depth to water measurements in all wells during each quarterly groundwater <br /> monitoring event for the purpose of determining the groundwater gradient. <br />