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San Joaquin County DIRECTOR <br /> PgU,rN Environmental Health Department Donne Her an,RENS <br /> �O.• ' ' ' ' •.CO P ASSISTANT DIRECTOR <br /> r.' 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> PROGRAM COORDINATORS <br /> _- Cad Borgman, REHS <br /> Mike Huggins,REHS,RDI <br /> Website:www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468.3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> January 16, 2009 <br /> Phillip Elder/Jay Quaddoura <br /> Rainwater Carwash <br /> 420 West Yosemite Avenue <br /> Manteca, CA 95337 <br /> Subject: Rainwater Carwash Site Code: 231458 <br /> 420 West Yosemite Ave <br /> Manteca, CA 95337 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Addendum to Interim Remediation Work Plan (WP) dated April 21, 2008, prepared by <br /> your consultant Advanced GeoEnvironmental, Inc. (AGE). In the WP, AGE recommends <br /> installing two additional on-site groundwater extraction wells, EW-2 and EW-3, screened <br /> between 15 and 45 feet bsg, to augment the existing groundwater remediation system. <br /> The EHD approves the proposed scope of work as necessary and adequate [CA H&S <br /> Code, 25296.10(c)(3)]. Submit to the EHD the necessary well permit applications, the <br /> $89.00 permit fee and the $315.00 inspection fee. Once the well permits have been <br /> approved, notify EHD of the proposed schedule for the work. The EHD requires a <br /> minimum 48-hour notice prior to initiation of any field work on the site. The EHD directs <br /> that the proposed work be implemented by March 27, 2000 VW! Q-/3-// <br /> The EHD has also reviewed Quarterly Ground Water Monitoring Report— Third Quarter <br /> 2008, (QR) prepared by your consultant AGE. The groundwater plume in the first water <br /> zone appears to be defined laterally in all directions by"non-detect" groundwater sample <br /> results for up to three consecutive quarterly monitoring events during the year 2008. The <br /> first water zone, as defined by AGE, is approximately 15 to 47 feet below surface grade <br /> (bsg) and is monitored by wells MW-1, MW-4, MW-5, MW-8A, MW-12A, & MW-13 A and <br /> MW13-B. Tetrachloroethene (PCE) and trichloroethene (TCE) are not being reported. <br /> The EHD letter dated September 26, 2007, directed that future analysis of ground water <br /> samples differentiate PCE and TCE from total petroleum hydrocarbons quantified as <br /> gasoline (TPH-g) and to report all peaks and anomalies to be able to monitor the effect <br /> of the groundwater extraction system on the dissolved PCE/TCE plume. As the <br /> PCE/TCE release is not likely to be related to the unauthorized release from your <br /> underground storage tank (UST) system, wells shown to be impacted predominantly by <br /> PCE/TCE may be put in a reduced sampling schedule. <br /> In the OR, AGE recommended reducing the frequency of groundwater sampling of <br /> selected monitoring wells to semi-annual and resurveying all monitoring wells to <br /> determine the current well casing top elevations to verify or correct measurements made <br /> during the 2004 survey. The EHD concurs with AGE's recommendation to resurvey the <br /> monitoring well casing tops. The EHD recommends reducing the frequency of <br /> groundwater sampling as follows: MW-11A and MW-12A to semi-annual, MW-1 and <br /> MW-4, MW-5, MW-8A, MW-10A, and MW-13A to annual sampling, and MW-2, MW-3, <br /> I <br />