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Limited Phase II Environmental Site Assessment <br />United Storage <br />2115 West Washington Street <br />Stockton, California <br />Delta Project No. A002-124-1 <br />Page 5 <br />Ground water samples were submitted under proper chain-of-custody protocol to Kiff Analytical for the <br />following laboratory analyses: <br />• W-B2 VOCs, TPH-G <br />• W-B5 VOCs, TPH-G, TPH-D <br />• W-B7 VOCs, TPH-G, TPH-D <br />• W-B8 VOCs, TPH-G, TPH-D <br />• W-B10 VOCs, TPH-G, TPH-D <br />All samples were stored in an iced cooler immediately after collection and during transport. Following <br />completion of the soil boring and ground water sampling activities, the borings were sealed with neat <br />cement grout. <br />4.0 LIMITED PHASE ll ENVIRONMENTAL SITE ASSESSMENT RESULTS <br />4.1 Subject Property Geology and Hydrodeology <br />The results of the soil characterization indicate that site geology consists of intermittent layers of sands, <br />gravels, and clays. Bedrock was not encountered during this investigation. According to Ground Water <br />in the Central Valley, California — A Summary Report (United States Geological Survey Water Supply <br />Paper 1401-A), unconsolidated deposits in the Stockton area are approximately 2,000 to 3,000 feet thick. <br />Soil boring logs are presented in Appendix B. <br />Ground water was encountered in five of the ten soil borings at depths ranging from approximately 9 to <br />15 feet bgs. Conditions described as moist to wet were encountered during the advancement of B-1, B-3, <br />B-4, B-6, and B-9, but ground water did not accumulate in the boreholes. Ground water monitoring wells <br />were not installed during this investigation and therefore a ground water flow direction determination was <br />not made. However, ground water flow is likely to the northwest, toward the Stockton Deep Water <br />Channel. <br />4.2 Field Screening Results <br />The results of the soil screening indicated PID readings ranging from 0.2 to 483 ppmv. Headspace vapor <br />concentrations above 100 ppmv were recorded in borings B-1, B-2, B-4, B-5, B-6, B-8, and B-9, generally <br />at depths greater than 7 feet bgs. These results were considered indications of potential contamination <br />and the soil samples exhibiting the highest PID readings were submitted for laboratory analyses. Odors <br />and staining were not observed in any of the soil borings. <br />e:\westwayterminalco\a002124 \1-stockton, ca \docs \stockton phase ii report.doc