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ADDITIONAL PHASE II SUBSURFACE INVESTIGATION Wells Fargo Bank Property 49 South Wilson Way Stockton, California INTRODUCTION Building Analytics is pleased to submit this report summarizing the Additional Phase II Subsurface Investigation to Wells Fargo Bank, Corporate Properties Group. This report is regarding the Wells Fargo Bank property located at 49 South Wilson Way in Stockton, California. The Phase 11 Subsurface Investigation was performed in accordance with the scope of services outlined in Building Analytics' Revised Workplan dated December 5, 1996. SBACKGROUND Site. Location The site is located at 49 South Wilson Way, on the northwest corner of Wilson Way and Market Street, in the City of Stockton, San Joaquin County, California(Figures 1 and 2). I The site is located in the northeast quarter of Section 32,Township I North, Range 6 East, of the Mount Diablo Base and Meridian. Phase I Environmental Site Assessment Building Analytics conducted a Phase I ESA of the subject property in October, 1995. The following environmental issues were identified: • According to historical Sanborn fire insurance maps, a gasoline service station existed on the subject property during the 1950's. The present bank building was indicated on the 1972 Sanborn Map. • During the site reconnaissance, Building Analytics observed an on-going subsurface investigation at the former Roek Construction facility adjacent, on the southeast corner of the intersection of South Wilson Way and Market Street. • The government record research indicated that a Texaco gasoline service station currently located adjacent, on the southwest corner of the intersection, is tidentified as a leaking underground storage tank(LUST) site. Initial Phase II Subsurface Investigation A Phase II Subsurface Investigation was performed by Building Analytics in February 1996,to investigate the potential of an environmental impact by the former on-site service station. Soil samples were collected from five geoprobe borings at depths of up to 25 feet below ground surface (bgs). All soil samples revealed non-detectable concentrations for total petroleum hydrocarbons as gasoline and diesel (TPH-g and TPH-d) and benzene, toluene, ethylbenzene and xylenes (BTEX). Total recoverable petroleum hydrocarbons (TRPHs) were found at concentrations ranging from 10 parts per million (ppm)to 31 ppm, which is well below Maximum Concentration Level (MCL)of 100 ppm as set forth by the 1 1 197046a - Stockton