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ENVIROWENTAL HEALTH'16EPARTMENT <br /> �OPQu' N•.CQ <br /> SAN JOAQUIN COUNTY <br /> Donna K. Heran, R.E.H.S. Program Coordinators <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> - - Laurie A. Cotulla,R.E.H.S. Stockton,California 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Assistant DirectorMargaret Lagorio, R.E.H.S. <br /> oq Telephone: (209)468-3420 <br /> �/FOR <br /> Robert McClellon, R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> ALLEN FETTERS 'At 31 2= <br /> RIPON FARM SERVICE INC <br /> 3705 PORTSMOUTH CIRCLE <br /> NORTH STOCKTON CA 95219 <br /> RE: Ripon Farm Service Inc. SITE CODE: 1605 <br /> 932 South Highway 99 (Formerly 22871 South Highway 99) <br /> Ripon, CA 95366 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Quarterly <br /> Report- Second Quarter 2006 prepared on July 14, 2006, by Advanced GeoEnvironmental, <br /> Inc. (AGE) on your behalf for the above-referenced site. In this report, AGE recommends <br /> that only monitoring wells MW-1, MW-2, MW-4, MW-9, and MW-10 be sampled during <br /> the third quarter 2006 groundwater sampling event, and that the groundwater samples be <br /> analyzed only for 1,2-dichloroethane (1,2-DCA) to reduce expenses. EHD concurs with <br /> these recommendations for the third quarter sampling event. However, continue collecting <br /> depth to water measurements in all wells during this and future quarterly groundwater <br /> monitoring events for the purpose of determining the groundwater gradient. <br /> Although EHD agrees to a reduction of sampling MW-3 and MW-5 during the third quarter <br /> of 2006, EHD directs that these monitoring wells be sampled annually. Please collect <br /> groundwater samples from these wells during the first quarterly sampling event each year <br /> and analyze the groundwater samples for total petroleum hydrocarbons as gasoline (TPH- <br /> g), total extractable petroleum hydrocarbons as diesel (TPH-d), and benzene, toluene, ethyl <br /> benzene, and total xylenes (BTEX). Also, in addition to analyzing groundwater samples <br /> for 1,2-DCA each quarter from the remaining wells (MW-1, MW-2, MW-4, MW-9 and <br /> MW-10), EHD directs that you collect groundwater samples annually from these wells <br /> during the first quarterly sampling event and analyze the samples for methyl tertiary butyl <br /> ether(MTBE), TPH-g, TPH-d, and BTEX. <br /> Additional investigation is needed to define the groundwater plume containing 1,2-DCA <br /> down gradient of MW-9 and MW-10, as recommended by AGE in Quarterly Report — <br /> Second Quarter 2006 Please submit a work plan to EHD by October 25, 2006, that will <br /> address the lateral extent of 1,2-DCA to the west-northwest of this site. <br />