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00-3737 2.2 Environmental Site Assessment Paragon's October 14, 1999 ESA of The Landing Shopping Center identified the following relevant evidence of a release or threat of release of OHM at the Site: • Municipal records indicate that Comet Cleaners, a dry cleaning facility, formerly occupied a portion of 3422 West Hammer Lane. Stockton Permit Center records included a January 30, 1989 Dry Cleaning Business permit for Comet Cleaners to operate a dry cleaning Class IV system (using PCE) at 3422 West Hammer Lane, Unit K. The Stockton Permit Center did not have any records of violations at this facility. Moreover, the Stockton Fire Prevention Office did not have any information regarding this facility. Our 1999 ESA concluded that a release of OHM did not likely occur at the Site since Comet Cleaners had used a closed-loop system, and neither the fire department nor the health department had any records of a release at the Site. During our ESA, an employee of Paul's Cleaners informed Paragon they have occupied the Site for approximately four years (since circa 1995) and never conducted dry cleaning operations at the Site (all cleaning conducted at an off-Site facility). Paragon's ESA did not recommend any further environmental investigation, but did state the only way to determine if the historic occupancy of the Site by a dry cleaning facility poses a material threat of a release of OHM to the Site would be through a subsurface investigation. 2.3 Soil Gas Survey Twining conducted a passive SGS at the Site that consisted of the installation of 13 Gore- Sorbere modules at the Site on April 24, 2000 and retrieval on May 9, 2000. Twining shipped the exposed modules (and a trip blank) to W.L. Gore & Associates, Inc. of Elkton, Maryland for analysis of chlorinated VOCs. Appendix B presents a copy of the May 17, 2000 Twining SGS Report. Table 1 on the following page summarizes SGS results. Figure 3 in Appendix A illustrates SGS sampling points and order-of-magnitude PCE concentration contours. 3422 West Hammer Lane,Stockton,California —4—