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Lin..._u Environmental Site Assessment Report 20 E.Lindsay Street,Stockton,CA June 24,2004 Page 5 Table 1 -Selected Metals Laboratory Analytical Results Constituent: Barium Chromium Cobalt Copper Lead Molybdenum Nickel Vanadium Zinc Analytical Method: 6010C 6010C 6010C 6010C 6010C 6010C 6010C 6010C 6010C Reporting Limit(mg/kg): 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 PRG(mg/kg): 5400 210* 900 3100 150 390 1600 550 23000 Boring Sample Depth Date GP-1 3.5-4.0 feet 6/10/2004 240 45 14 32 3.8 2.5 34 58 49 GP-2 3.5-4.0 feet 6/10/2004 160 39 12 28 3.8 2.3 31 50 46 GP-3 3.5-4.0 feet 6/10/2004 170 39 12 28 3.6 1.8 31 42 43 GP-4 3.5-4.0 feet 6/10/2004 180 1 43 1 14 31 1 3.7 2.8 35 53 47 GP-5 3.5-4.0 feet 6/10/2004 390 44 14 35 1 23 2.7 37 58F50 GP-6 3.5 -4.0 feet 6/10/2004 260 49 13 32 4.6 1.9 36 72 51 mg/kg: milligrams per kilogram,parts per million PRG:USEPA Region IX Preliminary Remediation Goal,residential *PRG for Total Chromium 5.0 CONCLUSIONS The historical research conducted for the site indicated that the site had generally been used for automotive repair and marine services purposes over the last fifty years.Field observations and laboratory analytical results indicate that the soil samples at the site have not been impacted by petroleum hydrocarbon constituents, SVOCs, or heavy metals. However, there is a concrete slab at the rear of the property with concrete-filled pipes that could have been fill or vent pipes for a former UST. It is possible that a UST is beneath this concrete slab, however the field observations and laboratory analytical results did not indicate contamination in boring GP-5, which was located southwest of the slab. If a UST exists there, it likely has been out of service for many years and may be filled with concrete. Based on the field observations and laboratory analytical results, a release to the site due to historical site practices does not appear to have occurred. Based on field observations, a UST is possibly located beneath the concrete slab at the rear of the property. During demolition of the existing structure, the concrete slab and possible UST should be removed and the soil immediately beneath should be sampled for contamination if a UST is discovered. 6.0 LIMITATIONS Condor has endeavored to determine as much as practical about the site within our scope of services using accepted principles and professional practice at the time the work was performed. This report is not intended to eliminate all risk of the subject property bearing some degree of environmental liability. Condor cannot and will not warrant or certify that the site is free of contaminants,because it is impossible to know if such a condition exists. Although risks can never be eliminated, more detailed and extensive investigations yield more information, which may help facilitate the management of risks. This project was performed in general conformance with Condor's Work Order Agreement dated May 4, 2004. The scope of work for this project was limited to a review of available historical data for the site and adjacent properties and an evaluation of selected constituents that may be present in the soil at or beneath the site resulting from previous and current activities on the property, and did not include other services that are not described in this report. The potential liability for the cleanup of hazardous substances and the available defenses to such liability are outlined in the Comprehensive Environmental i4 CONDOR