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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.Nmnber 04072 <br /> Office 408-979-0661 <br /> ! January 5, 2009 F-D) <br /> Project No. 0825 <br /> Mr. Peter Dana <br /> 160 West Santa Clara Street, Suite 990 ENVIROIWEd i 14LALTH <br /> San Jose, CA 95113 PERMIT/SERVICES <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 /> t 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 (p b) to 5,200 ppb. <br /> ' January 5 2009 Page I of 12 <br /> MAN OFFICE • 1707 LITTLE ORCHARD STREET, SUITE A•SAN JOSE• CA•95125 <br /> MARLING ADDRESS•P.O.Box 36303•SAN JOSE•CA•951585303•408/979-0661 •408/979-0621 FAX•LASCONSI^a A,n. Al E-h1AR. <br /> GENERAL AND ENGINEERING CONTRACTOR•HAZARDOUS SUBSTANCE REMOVAL,CONTRACTOR'SITE ENVIRONM1IFNTAL ASSESSMF,N-rS <br /> WETLAND AND RIPARIAN HABITAT—ASSESSMENT—DESIGN—RESTORATION—CONSTRUCTION—MITIGATION MONITORING <br />