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PUBLIC H15ALTH SERVICES ,oPQ �o <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION _ <br /> Karen Furst, M.D., M.P.H., Health Officer �.. <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 2091468-3420 FILE <br /> JOHN MINARD <br /> MANNA PRO CORPORATION JUN 2 31999 <br /> 707 SPIRIT 40 PARK DR STE 150 <br /> ST LOUIS MO 63005 <br /> Re: Manna Pro SITE CODE: 1088 <br /> 4004 S. EI Dorado <br /> Stockton, CA 95206 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) is the lead <br /> agency providing the oversight of the investigation and cleanup of releases from underground <br /> storage tanks (UST's)within San Joaquin County. PHSIEHD has a contract with California State <br /> Water Resources Control Board to conduct an underground storage tank program. The above <br /> referenced site was placed in the PHSIEHD Local Oversight Program (LOP) in August 1990. <br /> On June 3, 1999, PHSIEHD and Central Valley Regional Water Quality Control Board staff met <br /> with you and your consultant, Geo-Phase Environmental, to review the investigation and remedial <br /> activities for the above referenced site. We reviewed site history, findings from investigations, <br /> analytical results from monitoring events, and remedial action performed on site. <br /> In July 1990, five USTs were removed and 10 soil samples collected_ Soil sample results <br /> documented a gasoline and diesel release and the tank field was overexcavated to approximately <br /> 20 feet below ground surface (bgs). Due to the depth of the soil contamination and its close <br /> proximity to groundwater, additional soil and groundwater sampling was performed to further <br /> define the extent of the unauthorized release. <br /> In 1991, 6 monitoring wells (MW) were installed on site and groundwater contamination was <br /> documented. In 1993, 4 additional MWs were installed; one of these was installed off site to the <br /> northwest (MW7). Groundwater sample results taken from MW-7 indicated the contaminant <br /> plume had migrated off site in a northwesterly direction even though the bearing flow is currently <br /> northeast. <br /> An August 1994, Corrective Action Plan (CAP) prepared by Groundwater Technology to utilize <br /> groundwater pumping in conjunction with vapor extraction for site remediation was never <br /> implemented. At that time, groundwater was approximately 40 feet bgs and the vapor extraction <br /> system (VES)was engineered and designed accordingly. To date, 10 groundwater MWs have <br /> been installed, 9 on site and 1 off site. In addition, one groundwater extraction well and 3 <br /> observation wells were installed to perform a pilot test in preparation for and development of the <br /> CAP. <br /> At the June 3, 1999, meeting the following recommendations and directives were provided: <br /> 1. All wells within a 2000 foot radius of the site must be identified and the locations <br /> provided in a report to PHSIEHD. <br /> _a Division of San Joaquin Count,' Health Care Sen-ices <br />