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ENVIROT"IENTAL HEALTH")EPARTMENT <br /> OPO W.. c <br /> SAN JOAQUIN COUNTY <br /> a .1 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 /> C46F6R�`P Assistant Director Telephone: (209)468-3420 Margaret Lagorio, R.E.H.S. <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 /> STEPHANIE FURGAL SEP 2 5 20M <br /> CHEVRON ENVIRONMENTAL MANAGEMENT COMPANY <br /> 6001 BOLLINGER CANYON ROAD, ROOM K2240 <br /> SAN RAMON CA 94583 <br /> RE: Former Chevron Service Station 9-0557 <br /> 139 South Center Street <br /> Stockton, California <br /> On July 11, 2005, San Joaquin County Environmental Health Department (EHD) <br /> approved Work Plan for Monitoring Well Installation submitted on your behalf by <br /> SECOR International•Incorporated (SECOR). This work plan included the advancement <br /> of one cone penetrometer test (CPT) boring to approximately 130 feet below ground <br /> surface (bgs) to assess soil lithology, stratigraphy, and potential petroleum hydrocarbon <br /> contamination in preparation for the installation of an adjacent deep groundwater <br /> monitoring well with a five-foot screen interval. EHD recommended that the screen <br /> interval be targeted at either 105 or 115 bgs based on low pore pressure zones identified <br /> while reviewing boring logs for CPT-5, CPT-5A, and CPT-6. EHD directed that the <br /> groundwater samples be analyzed for diesel and motor oil in addition to the proposed <br /> analyses for total petroleum hydrocarbons as gasoline (TPH-G), benzene, toluene, ethyl <br /> benzene, total xylenes, (BTEX) and methyl tertiary-butyl ether (MTBE). On October 13, <br /> 2005, EHD issued well permit number 44355 for the advancement of this CPT boring <br /> and installation of the deep monitoring well. Nearly a year has gone by and this <br /> fieldwork has not been completed. You have until October 13, 2006, to complete this <br /> fieldwork under the current permit or else a new well permit application and permit fee <br /> must be submitted. Notify EHD at least 72 hours prior to commencing the fieldwork. <br /> EHD has reviewed Second Quarter 2006 Groundwater Monitoring Report dated August <br /> 14, 2006, submitted by Blasland, Bouck & Lee, Inc. (BBL) on your behalf. BBL <br /> recommends that groundwater samples collected from MW-3, MW-6, MW-13, and MW- <br /> 16 be analyzed annually. EHD approves the annual sampling for MW-16 only, and <br /> directs that groundwater samples continue to be collected quarterly from MW-3, MW-6, <br /> and MW-13 and analyzed for total extractable petroleum hydrocarbons as diesel and <br /> motor oil (TEPH-D and TEPH-MO); also include the analysis for 1,2-dichloroethane <br /> (1,2-DCA) for groundwater samples collected from MW-3. <br />