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San Joaquin County DIRECTOR <br /> ?o u IN <br /> Environmental Health Department Donna Heran,REHS <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> < Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Mike Huggins,REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Robert McClellon,REHS <br /> Phone: (209)468-3420 Jeff Carruesco, REHS,RDI <br /> Fax: (209)464-0138 Kasey Foley, REHS <br /> 26 February 2009 <br /> Endich Estate c/o Alice Endich P. Surinder and Karanti Singh <br /> 1770 Gillis Road 10620 Chantel Ln <br /> Stockton CA 95215 Stockton, CA 95212-9216 <br /> Subject: Former Top Filling Station <br /> 101 S. Wilson Way <br /> Stockton, California <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Request For <br /> Reduction of Monitoring Activities (the Request) dated 04 February 2009, prepared by <br /> Advanced GeoEnvironmental, Inc. (AGE) on your behalf. The Request states that the current <br /> financial difficulties are greatly delaying reimbursements from the State Water Resources <br /> Control Board Cleanup Fund (CUF) and that in turn affects your ability to comply with the <br /> current monitoring and sampling requirements for your site. The EHD was informed by <br /> telephone on 06 January 2009 that, as a result of the delayed reimbursements from the CUF, <br /> the SVE and GWE systems were shut down on 31 December 2008; this shutdown was without <br /> prior notification to, or the approval of, the EHD. <br /> The unauthorized release from the underground storage tank (UST) system formerly located on <br /> your site has intensely impacted both soil and groundwater. Impacted groundwater appears to <br /> have migrated off-site and impacted the former Roek Construction site at 102 S. Wilson Way, <br /> commingling with contaminants released from. a former UST system on the former Roek <br /> Construction site and from the UST system on the Arco site at 130 S. Wilson Way. <br /> Impacted groundwater on your site has been under interim remediation utilizing groundwater <br /> extraction (GWE) since November 2004; an estimated 774 pounds of dissolved contaminants <br /> have been removed from groundwater up through approximately 23 September 2008. Impacted <br /> soil above the groundwater zone on your site has been undergoing interim remediation through <br /> soil vapor extraction (SVE) since August 2004, and an estimated 21,415 pounds of <br /> contaminants have been removed as of 23 September 2008. The estimated contaminant <br /> masses removed demonstrate the effectiveness of both SVE and GWE on your site. <br /> Cessation of the interim remediation systems is of great concern to the EHD. Since initiation of <br /> interim remediation, the concentrations of dissolved contaminants in monitoring wells MW-2, <br /> MW-3 and MW-5 have declined to less than can be detected and quantified by the analytical <br /> laboratory, although a significant decline of contaminant concentrations in other monitoring <br /> wells, some intensely impacted, is not apparent. <br /> Fortunately, there are few sensitive receptors, such as water supply wells, in the immediate <br /> area that can be threatened by the uncontrolled migration of groundwater impacted by the <br /> contaminants released from your former UST system, however it does appear, as noted above, <br /> 101 S.Wilson Way/Directive Letter 0209.doc <br />