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LIGHT, AIR & SPACE CONSTRUCTION <br /> ENVIRONMENTAL SERVICES COMPANY <br /> State Contrac4or's License Number 445403 <br /> State EPA R.E.A.Number 04072 <br /> Office 408-979-0661 <br /> January 5, 2009 ���'/ <br /> Project No. 0825 �Jp <br /> Mr. Peter Dana <br /> 160 West Santa Clara Street, Suite 990 <br /> San Jose, CA 95113 <br /> Attn.: Mr. Peter Dana <br /> RE. Monitoring Well Installation and Soil and Groundwater Sampling <br /> 19589 McKinley Avenue,Manteca, CA <br /> Dear Mr. Dana, <br /> Light, Air, and Space Construction (LA&S) had prepared this Monitoring Well Installation and <br /> Soil and Groundwater Sampling report for the above referenced site. As you know LA&S <br /> prepared an underground storage tank (UST) removal and soil treatment report.dated June 30, <br /> 2006 and submitted to the San Joaquin County Environmental Health Department (EHD) under <br /> the Voluntary Cleanup Program of the USTs. After EHD review and comment of that report, <br /> three groundwater monitoring well locations were selected for installation near the former UST <br /> pits and the soil stockpile location. This report presents the monitoring well installation and <br /> related soil and monitoring well groundwater sampling, chemical analysis, 2000-foot radius well <br /> search and discussion of the data. <br /> 1.0 Background <br /> Two underground fuel tanks (one gasoline and one diesel) had been used on the property <br /> adjacent to the old barn/equipment storage building until about 1985 (see Figures 1 and 2). The <br /> tanks were removed in 2004 and soil and groundwater sampling indicated low levels of <br /> petroleum contaminants in 2006. Approximately 300 cubic yards of soil were excavated from <br /> the two former UST pits. Contaminants were not detected in the excavation extremity soil <br /> samples obtained after the over-excavation of the tank pits. The soil was placed on plastic to the <br /> rear of the barn and allowed to aerate from May 2006 through to October 2008. Water samples <br /> collected on June 16, 2006 from the former tank pits showed Total Petroleum Hydrocarbons as <br /> Diesel ranging from 81 parts per billion (ppb) to 5,200 ppb. <br /> January 5, 2009 _ Page 1 of 12 <br /> MAIN OFFICE • 1707 LITI'LE ORCHARD STREE 1',SUITE A •SAN.LOSE•CA•95125 <br /> MAILING ADDRESS•P.O.Box 36303•SAN JOSE•CA•95158-6303•408/979-0601 •408079-0621 FAX•LASCONS,I @At)1-COME-MAIL <br /> GENERAL AND ENGINEERING CONTRACI'OR•HAZARDOUS SUBSTANCE RFMOVAL CONTRAC'T'OR'SITE ENVIRONMENTAL ASSESSMENTS <br /> WETLAND AND RIPARIAN HABITAT—ASSESSMENT—DESIGN—RESTORATION—CONS'T'RUCTION—MITIGATION MONITORING <br />