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"_ K ^itl:.+710. •i �1.}.;:j� - <br /> �..de Gfi0. 77,7 80te!50'..nv@''i'I11(tul l.:C@ <br /> May 28, 1991 <br /> Mr. Ric tiotini <br /> Director of Environmental Services <br /> Catellus Development Company <br /> 201 Mission Street, 30th Floor <br /> San Francisco, CA 94105 <br /> REGARDING: 15 i5 Nest Weber Avenue, Stockton, CA <br /> Report of Findings <br /> Dear Ric: <br /> ERM-`Vest has completed Fieldwork at the former underground storage <br /> tank site located at the 1515 Nest Weber address. Herein we report our <br /> findings. <br /> �i�mmary <br /> Samples collected in the Field, both below the tank site and immediately <br /> hydraulically downgradient, indicated that gasoline and gasoline-derived <br /> compounds are present in the soils and groundwater. Laboratory reported <br /> Findings are: <br /> • Total Volatile Hydrocarbons (gasoline) are below 10 ppm in the soils and <br /> + below 20 ppm in the groundwater; <br /> • Total BTE&X are below 2.5 ppm in the soils and below 4.6 ppm in the <br /> groundwater; <br /> • Organic derived lead was not discovered either in the soils or in the <br /> groundwater. <br /> Detailed laboratory findings are summarized in Table 1. <br /> The tank site was found to be underlain by two soils types. From the ground <br /> surface to a depth of approximately ten feet, the soils consist of semi- <br /> consolidated silt and silty clay. Below 10 feet and to the depth explored(30 <br /> feet), the soils consist of unconsolidated sand. <br /> Groundwater was encountered in the borings at a depth of approximately 6 <br /> 1/2 the <br /> ng <br /> new wells indicated a sit. 'Measurement milar depth to er levels in <br /> Prior to well constructiols and in n by <br /> nes <br /> An atithare of The Enwronrnmat P.escvrces hlanaoement Grouo wdn ori ces:vonaw oe ��, <br />