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Limited Phase II Environmental Site Assessment United Storage 2115 West Washington Street Stockton, California Delta Project No. A002-124-1 Page 7 4.6 Ground Water Regulatory Criteria The California Department of Health Services has established Primary Maximum Contaminant Levels (MCLs). The MCLs for contaminants identified at the subject property are provided in Table 2. These guidelines were used for comparison purposes only as development of site-specific standards was not within the scope of this assessment. MTBE was detected at a concentration of 13 pg/L in the ground water sample collected from B-7, equaling the MCL of 13 pg/L. TPH-D was detected in W-B8 and W-B10; however, no MCL has been established for TPH-D. 5.0 CONCLUSIONS AND RECOMMENDATIONS Based on field observations and the results of laboratory analyses of ten soil and five ground water samples at the United Storage property located at 2115 West Washington Street in Stockton, California, Delta has identified the following potential environmental concerns: Field observations indicated that PID levels above 100 ppmv were recorded in all borings with the exception of B-3, B-7, and B-10. However, VOCs and TPH-G were not detected in any of the soil samples. Arsenic was detected in all ten soil samples at concentrations that exceed the PRGs for industrial soils. However, the concentrations did not show significant variability and all soil samples were collected from depths (between 8 and 16 feet bgs) at which metals impacts would not be expected due to anthropologic activity. Delta therefore assumes that the arsenic concentrations are representative of background soil quality in the area and do not signify impacts. The mercury detections of 0.321 mg/kg in B1-12 and 0.102 mg/kg in B10-12 exceed the PRG of 0.0 mg/kg. These concentrations were an order of magnitude greater than the method detection limit of 0.0835 mg/kg. The MTBE concentration detected in ground water sample W-B7 was equal to the compound's MCL. Additionally, elevated TPH-D concentrations were detected in ground water samples collected from B-8 (1,100 pg/L) and B-10 (470 pg/L). The subject property is situated in a predominantly industrial area and other properties in the area have reported releases to the San Joaquin County Environmental Health Department. Based on the limited extent and low concentrations of impacts identified during this Phase II ESA, Delta recommends no further investigation at the subject property. In addition, Delta recommends that United Storage request the issuance of a written concurrence from the county. Please note that as a condition of obtaining an environmental drilling permit from the county, Westway is obligated to submit a copy of this report to the county. e:\westwayterminalco\a002124 \l-stockton, ca\docs\stockton phase ii report.doc