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R E Y N O%, L D S R O W N <br /> L <br /> November 11, 1987 Q� 191 <br /> aM�`� <br /> Ms. Lori Cotulla and Mr. Dan Moe Nv\R <br /> San Joaquin County Health District FER <br /> 1601 E. Hazelton Avenue <br /> Stockton, Ca 95201 <br /> RE: GROUNDWATER ASSESSMENT OF PROPERTY LOCATED AT 724 E. GRANT LINE <br /> ROAD, TRACY, CA <br /> Dear Ms. Cotulla and Mr. Moe: <br /> It is my understanding that your agency may be requiring Reynolds & <br /> Brown to install several groundwater monitoring wells at the property <br /> in order to define the extent of benzene contamination in the aquifer. <br /> The request made by Mr. Moe is based on the results of a report by <br /> Applied Geosystems indicating the presence of benzene in standing <br /> groundwater upon removal of an underground tank at the subject <br /> property. Following your suggestion, we followed the advice of our <br /> consultants, Aqua Terra Technologies, Inc. They suggested resampling <br /> the existing monitoring well because the groundwater sample collected <br /> by Applied Geosystems was not taken according to protocol established <br /> by the Department of Health Services or the Regional Water Quality <br /> Control Board for collecting of groundwater. The results of resampling <br /> the existing monitoring well indicated that benzene was not detectable. <br /> I am of the opinion that appropriate measures were taken to determine <br /> if contamination exists, which the following findings state otherwise: <br /> 1. Soil samples analyzed by Applied Geosystems indicated no <br /> contamination. <br /> 2. The down gradient well, installed and sampled by Kennedy, Jenks & <br /> Chilton, indicated no detectable levels of benzene. (Report dated <br /> January, 1987.) <br /> 3. Kennedy, Jenks & Chilton found no detectable levels of benzene in <br /> soil samples and 13 50 43 mg/Kg (ppb) of toluene in soil. <br /> 4. The resampling of the existing well for benzene, xylene and <br /> toluene by Aqua Terra Technologies, .indicated no detectable levels <br /> of these compounds. <br /> 5. The sampling of the groundwater by Applied Geosystems was <br /> inappropriate and not according to acceptable protocol. <br /> 6601 Owens Drive <br /> Suite 104 <br /> Pleasanton,California <br /> 94566 <br /> Telephone <br /> 415 4631250 <br />