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LIGHT, AIR & SPACE CONSTRUCTION <br /> ENVIRONMENTAL SERVICES COMPANY <br /> State Contractor's License Number 445403 <br /> State EPA R.E.A.Number 04072 <br /> June 27, 2007 <br /> Mr. Michael J. Infurna <br /> Environmental Health Department, County of San Joaquin <br /> 304 Weber Avenue, Third Floor <br /> Stockton, CA 95202-2708 <br /> Re: Proposed Work Plan for Monitoring Well Installations, Site at <br /> Dutra Farms, Inc. 19589 S. McKinley Ave., Manteca, CA 95336 <br /> UST Site Code: #39-0515755&56; ROM 1780 PR#: 0525999 <br /> LA&S Project Number 0616 <br /> Dear Mr. Infurna, <br /> At the request of the property owner, Dutra Farms Inc., Light, Air and Space Construction <br /> (LA&S) has prepared the following Proposed Work Plan for Monitoring Well Installations to <br /> further delineate extent of hydrocarbon contamination found in the soil and groundwater by <br /> previous environmental investigations at the subject site by LA&S. The County of San Joaquin <br /> Environmental Health Department (EHD) has requested this additional delineation work for the <br /> two underground fuel storage tanks removed at the above referenced site. <br /> 1.0 Background <br /> The subject property is located on the southwestern side of west side of South McKinley <br /> Avenue at 19589 McKinley Avenue (about 250 feet south of Bronzan Road) in Manteca, CA. <br /> Two 1,000-gallon underground petroleum fuel storage tanks were removed from the property on <br /> December 21, 2004. The tanks were removed under approved EHD permits and the results of <br /> the tank removal were presented in LA&S report dated January 5, 2005. Total Petroleum <br /> Hydrocarbons as Gasoline and Diesel (TPHG and TPHD) were detected in soil underlying the <br /> former tanks. The most elevated values were 690 milligrams per kilogram (mg/kg) TPHG and <br /> 24,000 mg/kg TPHD under UST-2. Xylenes and Lead were detected in some soil samples. <br /> BTEX, MTBE and oxygenates were not detected in any soil sample (see LA&S January 5, 2006 <br /> report for complete results). <br /> LA&S performed excavation of contaminated soil from the former tank pits in 2006. BTEX, <br /> MTBE and oxygenates and Ethanol were not detected in any soil sample or water sample. <br /> Organochlorine pesticides were not detected in the one soil sample tested. TPHD was detected <br /> in water samples, the highest of which was 5,200 micrograms per liter (ug/1). Lead was not <br /> detected in the water samples. <br /> Pagel of 5 <br /> MAIN OFFICE • 1707 LITTLE ORCHARD STREET, SUITE A•SAN JosE• CA•95125 <br /> MAmiNG ADDRESS a P.O.Box 36303 a SAN JOSE•CA•95158-6303 e <br /> 40"79-0661 oFFICE•408/979-0621 FAX•408/640-2899 CELL PHONE•DGU HRIDGE@LIGFTIAMANDSPACE.COM E-MAIL <br /> GENERAL AND ENGINEERING CONTRACTOR•HAZARDOUS SUBSTANCE REMOVAL CONTRACTOR•SITE ENVIRONMENTAL ASSESSMENTS <br /> WETLAND AND RIPARIAN HABITAT-ASSESSMENT-DESIGN-RESTORATION-CONSTikumON-MmGATION MONITORING <br />