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LEE & PIERCE inc. <br /> consulting engineers <br /> CIVIL• ENVIRONMENTAL•AGRICULTURAL <br /> 546 ABBOTT ST,STE 20 135 SOUTH FIFTH AVE,STE C <br /> SALINAS,CA.93901-4373 OAKDALE,CA.95361 4092 <br /> (831)758-0096 PHONE (209)848-8270 PHONE <br /> (831)758-1213 FAX (209)848-8274 FAX <br /> b elich leeand ierce.com ilaneWeeandpierce.com <br /> September 30, 2009 [��] <br /> Mr. Michael Infurna OCT 0 2 2009 <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street ENVIROWENT HEALRI <br /> Stockton, CA 95202-3029 PERMITISERVICES <br /> Subject: Site Closure Report Addendum <br /> Former Reeve's Exxon,2360 East Street, Tracy, CA <br /> Site Code RO:0200, Global ID#T0607700490 <br /> Dear Mr. Infurna: <br /> As we discussed, Lee and Pierce, Inc. is submitting this addendum to the Site Closure Report on <br /> behalf of the John Pestana QTIP Trust to clarify issues raised during our recent telephone <br /> conversation. Specific issues are addressed below. <br /> 1. Nearby surface water bodies: The nearest surface water body to the site is Thomas Paine <br /> Slough, located approximately 1.75 miles north-northeast of the site, although "Sugar Cut" is <br /> located approximately 1.5 miles north of the site. An additional site vicinity map showing <br /> nearby features is included in Attachment 1. <br /> 2. Disposition of drilling/sampling waste from most recent investigation: Three drums of soil <br /> were transported to Forward Landfill for disposal. In addition, 55 gallons of purged <br /> groundwater was transported by American Valley Waste Oil, Inc. to Ramos Environmental <br /> Services in West Sacramento for disposal. Copies of the non-hazardous waste manifests are <br /> included in Attachment 2. <br /> 3. Ethanol, Methanol, EDB, and 1,2-DCA: Monitoring wells MW-1, MW-2, and MW-3 were <br /> analyzed for ethanol and methanol on February 5, 2002 and all results were below laboratory <br /> detection limits. All site wells were sampled for EDB and 1,2-DCA on multiple occasions, <br /> most recently in December 2008 and all results were below laboratory detection limits. <br /> Revised data tables that incorporate all soil and groundwater data collected to date are <br /> included in Attachment 3. <br /> 4. Initial groundwater concentrations versus current groundwater concentrations: Worst- <br /> case groundwater quality conditions can be represebted by the grab groundwater sample <br /> collected from the UST excavation pit in April 1991 (RETP I-B-9.5'), which contained TPHg <br /> and benzene at concentrations of 120,000 µg/L and 14,000 gg/L, respectively. The most <br /> recent groundwater samples collected from site wells (December 2008) were less than the <br /> laboratory detection limits for wells MW-1, MW-3, MW-4, and MW-5, while well MW-2 <br /> contained TPHg and benzene at concentrations of 310 pglL and 3.7 pg/L, respectively. Table <br /> 2 in Attachment 3 contains a comprehensive summary of groundwater analytical results. <br /> 07607 closurcaddcndum <br />