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U <br /> GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES <br /> INSPECTIONS R TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> January 10, 2008 <br /> Our Project Number: E07191B <br /> Mike Escotto, Sr. REHS <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Addendum to Soil Suitability/Nitrate Loading Study <br /> Traylor Shea Precast, APN: 132-060-02 <br /> 3836 North Newton Road <br /> Stockton, California <br /> Report Dated November 29, 2007 <br /> Dear Mike: <br /> Per your request, NOA has prepared this addendum to the Soil Suitability/Nitrate Loading Study <br /> (SS/NLS) for the above Site. In the report, we indicated that "NOA is concurrently preparing a <br /> Phase I Environmental Site Assessment for the Site; the assessment has identified an open <br /> leaking underground storage tank case to the northwest of the Site; ground water in the area <br /> has been impacted." <br /> The Phase I report has since been completed (E07191A, November 2007). The section of the <br /> Phase I which refers to this nearby facility is included here for your reference: <br /> Facility Name Location(miles) Database Comments <br /> Gillies Trucking Adjacent to LUST* According to the most recent quarterly monitoring report' <br /> 3931 Newton Rd. Nbv available from GeoTradcer,groundwater at this site flows <br /> primarily to the east,toward the subject property. Diesel <br /> and gasoline underground storage tanks were removed in <br /> 1989, and diesel was found to be the primary contaminant. <br /> Diesel was detected at 177 pg/L within the monitoring well <br /> closest to the subject property In July 2007. A8liough this is <br /> a very low level of diesel,the report notes that the dlesel <br /> Concentration has Increased In that well over time, <br /> "suggesting that the plume is generally attenuating and <br /> being diluted as hydrocarbons diffuse outward from the <br /> center." It appears that this well has never been tested for <br /> gasoline or related additives;most of the other monitoring <br /> wells located within the same aquifer have Similarly never <br /> been tested. Records for this site were reviewed at the EHD <br /> on November 28,2007. In two letters dated June 6 and <br /> October 31.,2007,the EHD expressed its concern about the <br /> I Upgradient Environmental Consultants, 2007, Second Quarter 2007 Report, Gillies Trucking. <br /> ANGELS CAMP • LODI MODESTO • RENO • SACRAMENTO • WALNUT CREEK <br /> LODI 902 Industrial Way Lodi,CA 95240 • 209.367.3701 • FAX 209-369.4228 • www.noandemon.com <br />