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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Qs Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl$orgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, Califomia 95202-2708 Mike Huggins,R.E.H.S.,R.D.I. <br /> Douglas W.Wilson,R.E.H.S. <br /> ,4• : P Program Manager Telephone: (2,09) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �r F o Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0.138 Robert McClellon,R.E.H.S. <br /> Mark Barcellos,R.E.H.S. <br /> PETE GRAFFIGNA MAY 17 200' <br /> FLAME MINI-MART <br /> 1301 W KETTLEMAN LANE <br /> LODI CA 95242 <br /> RE: FLAME MINI-MART SITE CODE: 1342 <br /> 1301 W KETTLEMAN LANE <br /> LODI CA 95242 <br /> San Joaquin County Environmental Health Department (EHD) is the lead agency <br /> providing oversight for investigation and cleanup of releases from underground storage <br /> tanks (UST) within San Joaquin County. In 199;8, gasoline and MTBE contamination <br /> was discovered in soil at the time of a UST removal from your site resulting in the above <br /> referenced site being placed in the EHD Local oversight Program. Monitoring wells <br /> (MWs) were installed in 1999 and groundwater ;contamination was documented. The <br /> groundwater sample analytical results evidence TPH-gas, BTEX, and MTBE <br /> contamination. <br /> EHD staff reviewed the 11 November 2004 Site Assessment Work Plan (WP) submitted <br /> by Advanced GeoEnvironmental, Inc. (AGE) on behalf of Flame Mini-Mart for the above <br /> referenced site. EHD staff prepared a response to the WP conveyed by letter dated 14 <br /> January 2005. That correspondence asked ;for corrections to the AGE report, <br /> justification for soil investigation outside the former UST area, and submittal of a Site <br /> Conceptual Model (SCM). The1etter also informed you of the problems associated with <br /> the proposed groundwater pump and treat pilot test and the effluent disposal issues. <br /> No City of Lodi conveyances (sanitary sewer or storm drain) are currently available for <br /> disposal of the treated water and, as such, groundwater pump and treat would not be <br /> feasible at the site. You were directed to evaluate other remediation technologies that <br /> would be feasible and could be used to cleanup soil and groundwater impacted by the <br /> unauthorized release. <br /> EHD requested a revised WP that would include: 1) justification for the proposed wells <br /> to further define the contamination; and 2) evaluation of feasible alternatives for <br /> cleanup of the site soil and groundwater. AGE responded with Revised Additional Site <br /> Work Plan, dated 28 February 2005. EHD staff have completed review of that revision <br /> and have these comments. <br /> Increasing MTBE concentrations in most wells indicate an unstable, expanding <br /> groundwater plume. Over time, without site remediation, contaminant concentrations in <br />