ARCHIVED REPORTS - GROUNDWATER MONITORING WELL INSTALLATION AND LIMITED SOIL SAMPLING

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M KLEINFELDER ' 3 BACKGROUND Kleinfelder has been requested to provide this proposal to address the installation of three monitoring wells, conduct limited soil sampling and analysis, and a lead and asbestos survey at the Elk's Lodge Property located at 317 South Center Street, Stockton, California. Based on a prior Environmental Site Assessment Report conducted by Condor Earth Technologies dated August 15, 2000, Kleinfelder understands the subject site historically has been used for residential, commercial, retail, and industrial purposes. It has been previously used as an auto ' parts wrecking yard (1949-1955) and a dry cleaning facility. The site was reportedly"completely cleared" in 1960. The following conclusions and recommendations were provided in the Condor report: ' 1) Sampling of one of the buildings on the site has documented the presence of asbestos containing building materials. The materials would need to be properly removed by ank asbestos abatement ' contractor prior to demolition of the building. 2) The site and surrounding area has been developed for over a 110 years. The area has been used ' for residential, commercial,retail and industrial purposes. The area and the site history is long and complex, therefore, it is difficult to develop a complete chronology. The information developed concerning the site places it in a high-risk environmental category with many known, and possibly ' many unknown, off-site contaminant release locations. In addition,the historical use of portions of the site as an auto part wrecking yard and laundry(with the possibility that dry cleaning operations were conducted with solvents) increases the risk associated with on-site sources of contaminants. This complicates the determination of whether any discovered contaminants are from on-site or off-site sources. 3) The critical question concerning the site is if any contaminants exist at the site, and whether any ' off-site sources of contaminants have migrated via groundwater to impact the site. Potential off- site sources of contaminants should be evaluated by testing up-gradient perimeter of groundwater sampling points. On-site sources of contaminants should be evaluated by random systematic ' sampling of soils and groundwater. The potential contaminants range from the spectrum of hydrocarbons (grease, oil, diesel and gasoline), to solvents and metals. Additionally, a geomagnetic survey would also reduce the risk associated with buried tanks,drums and other metal debris that could act as future sources of contamination while minimizing future surprise discoveries during construction activities. To lower the risk associated with the site, we recommend a Phase II Environmental Site ' Assessment be performed. This assessment should include at a minimum, the following field and analytical work: ' • On-site random systematic soil and groundwater sampling; • Up-gradient perimeter groundwater sampling; • On-site geomagnetic survey for buried metallic objects. All soil and groundwater samples should be analyzed for: • Hydrocarbons ranging from grease to gasoline; ' Benzene,Toluene, Ethylbenzene,and total Xylenes; 42162/01 /ST04R854 Page 7 of 22 Copyright 2004,Kleinfelder,Inc. July 1,2004 1