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. PHASE H ENVIRONMENTAL SITE ASSESSMENT REPORT MULTI-MODAL STATION "SIX-BLOCK PROJECT" STOCKTON, SAN JOAQUIN COUNTY,CALIFORNIA January 13,2002 1.0 INTRODUCTION Condor Earth Technologies, Inc (Condor) performed a Phase II Environmental Site Assessment (ESA) for the properties incorporated by the Stockton Multi-Modal Station/Shopping Center located in the six blocks bounded by East Miner Avenue (north), North Stanislaus Street (west), East Weber Avenue (south), and the Union Pacific Railroad right-of-way(east) (Figure 1 and 2, Appendix A) The work was performed for the City of Stockton, Department of Housing and Redevelopment(DHR) These same properties were the subject of the Phase I Environmental Site Assessment Report, Multi- Modal Station/Shopping Center, "Sax-Block" Project, prepared by Condor dated May 31, 2001 (Phase I ESA) Recognized Environmental Conditions (RECs) and the Historically Recognized Environmental Conditions (HRECs) were found during the Phase I ESA These RECs and HRECs were investigated in greater detail during the Phase II ESA The scope of work included a cone penetration test (CPT) investigation, a limited ground penetrating radar (GPR) investigation, a Geoprobe investigation, and additional work performed in response to encountered site conditions CPT borings were installed around the site in the public right-of-way to obtain lithologic information regarding the site, especially aquifers . and aquitards The GPR investigation was performed to gamer additional information pertaining to subsurface conditions at proposed boring locations on selected private properties within the site The Geoprobe investigation was designed to help delineate the possible locations and extent of soil and groundwater contamination Additionally, the businesses on parcels without previously identified RECs or HRECs were further reviewed to investigate past handling practices of hazardous materials and wastes The Phase II ESA fieldwork was performed between May 13 and September 16, 2002 2.0 PROJECT BACKGROUND The Phase I ESA completed by Condor in May 2001 revealed evidence of RECs and HRECs related to the site properties and the adjacent properties (Figure 3, Appendix A) Three RECs were identified on the site properties • San Joaquin County Environmental Health Department (EHD) records indicated ten underground storage tanks (USTs) were present at the former Stockton Metropolitan Transit District facility at 730 E Channel Street (145 N Grant Street) in 1985 Two USTs were reportedly removed in 1987, but no additional information regarding the remaining eight USTs was observed in the EHD records The existence of USTs on-site,both past and present, represents a potential risk to soil and groundwater • A gas station was listed in the City Directories at 802 E Miner Avenue in 1940 The current address for this property is 808 E Miner Avenue No further information regarding the gas station or possible UST removal was found The existence of USTs on-site, both past and present, represents a potential risk to soil and groundwater • A current groundwater investigation north of the site across Miner Avenue at 308 N Grant Street • indicates high concentrations of contaminants in the groundwater at this property The possible migration of these contaminants to the groundwater beneath the site constitutes a potential risk 1 %0 CONDOR