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I. in any of the soil samples collected for analyses from the monitoring well soil borings and the other shallow soil samples collected from the various portions of the site. The metal concentrations detected in groundwater samples were all below the Primary Maximum Contaminant Levels for each metal included in this assessment as referenced in the California Environmental Protection Agency, Regional Water Quality Control Board, Central Valley Region, A compilation of Water Quality Goals, August 2003 The TDS concentrations in each of the water samples collected from the monitoring wells ranged from 400 mg/1 (MW-3) to 1,120 mg/1 (MW-2). Two of the three monitoring well samples exceeded the SMCL for TDS of 500 mg/l. Only the concentration in MW-3 (downgradient) was below the MCL for TDS. The TDS concentration in the domestic well was 730 mg/l and exceeded the SMCL for TDS of 500 mg/l. Geophysical Survey The results of the geophysical survey showed one anomaly which coincided with the past known location of, and displayed a geophysical response typical of an UST. The location (Anomaly A) was noted as being on the west side and in the proximity of the southwest corner of the warehouse/shed on the site. 6.3 RECOMMENDATIONS Based on the results of this limited soil and groundwater assessment and geophysical survey conducted on the site, Kleinfelder recommends the following: At this time Kleinfelder recommends that limited use of the domestic water supply well be enacted to reduce exposure due to possible ingestion and contact of the water due to the elevated nitrate and 1,2-Dichloropropane concentrations detected. Bottled water or alternate sources should be used at least for drinking and/or food preparation. 1,2- Dichloropropane can typically be removed from the water with the use of an activated carbon filter system. At this time Kleinfelder recommends that the suspect area at "Anomaly A" noted in the geophysical survey be investigated further by conducting a limited soil excavation to ascertain the presence or absence of an UST. If a UST is discovered in that location proper methods and protocols should be followed in accordance with State and Local regulations governing the removal and proper abandonment of the UST. Kleinfelder recommends that a copy of this report be forwarded to the RWQCB and EHD for their review and comment. 27125.E01 / STO4R181 © 2004 Kleinfelder, Inc. KLEINFELDER 2825 East Myrtle Street, Stockton, CA 95205-4794 (209) 948-1345 (209) 948-0621 fax Page 21 of 23 February 13, 2004