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<br /> San Joaquin County DIRECTOR
<br /> CIO Donna Heran, REHS
<br /> O.P . Environmental Health Department ASSISTANT DIRECTOR
<br /> ). _ <
<br /> 600 East Main Street Laurie Cotulla, REHS
<br /> FogStockton, California 95202-3029
<br /> PROGRAM COORDINATORS
<br /> Carl Borgman, REHS
<br /> c ., _,p • Mike Huggins,REHS, RDI
<br /> 4 FORS) 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 Feld work on the site. The EHD directs
<br /> that the proposed work be implemented by March 27, 2008.
<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 /> MW13-13. 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 QR, 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 />
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