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Advanced <br />GeoEnvironmental Inc. <br />N <br />`1 r- <br />19 September 2002 rn <br />AGE-NC Project No. 99-0557 w <br />Mr. Michael R. Whelan r3 �r+- <br />UNION SAFE DEPOSIT BANK <br />317 E. Main Street <br />Stockton, California, 95202 <br />Subject: Site Evaluation, Report Review and Ground Water Sampling <br />TRADEWAY CHEVROLET <br />1460 East Yosemite Avenue, California <br />Dear Mr. Whelan: <br />At your request, Advanced GeoEnvironmental, Inc. (AGE) researched the Tradeway Chevrolet <br />property and surrounding properties with respect to the property history and use. and the potential <br />of surrounding properties to affect ground water beneath the property. AGE also reviewed the report <br />Monitoring Well Installation, Ground Water Sampling and Analysis - Tradeway Chevrolet, dated <br />01 July 2002, prepared by Kleinfelder, Inc. and performed a sampling and analysis program to verify <br />and augment the results and recommendations presented in the Kleinfelder report. <br />Kleinfelder noted in the July report that they advanced three soil borings on 20 May 2002, collected <br />soil samples at 10 feet and 15 feet below surface grade (bsg) and analyzed for TPH-g (gasoline), <br />benzene, toluene, ethyl benzene and xylenes (BTEX), fuel oxygenates (MTBE, TAME, DIPE and <br />ETBE), methanol and Total Extractable Petroleum Hydrocarbons (fuel fingerprint). Kleinfelder <br />reported that there were no detected concentrations found in soil for the listed analytes. <br />Kleinfelder noted in the July report that they completed the borings as monitoring wells and collected <br />water samples on 28 May 2002, analyzing for TPH-g, BTEX, fuel oxygenates, methanol and fuel <br />fingerprint. Kleinfelder reported that of all the analytes with established water quality goals (WQGs), <br />only benzene exceeded the WQGs in one ground water sample (MW -2) with a concentration of 1.5 <br />µg/1; the maximum contaminant level (MCL) for benzene was 1.0 µg/1. Toluene, ethylbenzene and <br />xylene were also found in MW -2, but at levels below the WQGs. <br />Methanol was detected in MW -1 with a concentration of 110 µg/1; Kleinfelder stated that there was <br />no MCL for methanol, but there was a taste and odor threshold WQG of 740,000 4g/1. MW -1 was <br />located down -gradient to the hydraulic lifts and MW -2 was located upgradient to the hydraulic lifts. <br />Kleinfelder recommended that further subsurface investigations be performed upgradient or east of <br />837 Shaw Road, Stockton, California 95215 <br />Telephone (209) 467-1006 FAX (209) 467-1118 <br />