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r? iii Fourth Quarter 2005 Groundwater Monitoring and Remediation Status Report • Cohn Property,3755 Munford Avenue Stockton,California Page 2 BACKGROUND May 1991 - One 10,000-gallon diesel UST, one 1,000-gallon gasoline UST, and all associated piping were removed by SEMCO Analytical testing indicated the samples collected from beneath the former USTs contained detectable concentrations of petroleum hydrocarbons November 1997 - M J Kloberdanz and Associates advanced one soil boring at the site and investigation activities are summarized in M J Kloberdanz's Phase IInvestigation Report, dated November 24, 1997 i November 1998 - ATC and Associates (ATC) installed three additional soil borings, which were later converted into groundwater monitoring wells (MW-1, MW-2 and MW-3) Soil and groundwater analytical results indicated petroleum hydrocarbons had impacted the site December 2000 - ATC advanced one cone penetrometer(CPT-1) and five additional soil borings The soil borings were converted into groundwater monitoring wells MW-4 through MW-8 September 2001 - ATC installed four geoprobe soil borings (SB-1 through SB-4), three vapor extraction wells (VW-1 through VW-3), two piezometers (PZ-la and PZ-lb), one air sparge point (AS-1), and two additional groundwater monitoring wells (MW-9 and MW-10) October 31 and November 1, 2001 - ATC conducted a short term and long term vapor extraction test December 2001 and January 2002 - ATC conducted an air sparge pilot test for approximately 31 days The results are documented in the ATC report, titled Remedial Invesitgation/Feasibility Study, Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, dated August 13, 2002 June 16 - 19, 2003 - ATC installed four CPT bonngs (CPT-2 through CPT-5) July 21, 2003 - ATC conducted a five hour groundwater pump test The results are documented in the ATC report, titled Summary of Additional Subsurface Investigation, Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, dated July 12, 2004 May 2005 - Apex began conducting groundwater monitoring and remediation system installation activities at the site Prior to Apex, work conducted at the site included subsurface investigations and groundwater monitoring by ATC Associates in Modesto, California Site details maybe found in the report, titled Monitoring Report Fourth Quarter 2004, Pacific Coast Recreation, 3755 Munford Avenue, Stockton, California, Site Code 1865, dated January 28, 2005, submitted to Cohn by ATC