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PHASE H ENVIRONMENTAL SITE ASSESSMENT REPORT Buena Vista Storm Drain Stockton, California March 30, 2005 1.0 INTRODUCTION This report was prepared by Condor Earth Technologies, Inc. (Condor) to describe a Phase II Environmental Site Assessment (ESA) conducted on March 15, 2005, for the Buena Vista storm drain at the request of Kjeldsen Sinnock Neudeck, Inc., (Client). A new storm drain pump station is to be installed at the southern end of Buena Vista Avenue in the city of Stockton. A connecting storm drain collection system will be installed to drain storm water to the new pump station. Groundwater may be encountered during the installation of the storm drain collection system and the pump station. The purpose of the Phase II was to evaluate the potential for contaminants in groundwater that may be encountered during construction activities. The area investigated (Site) was located at the south side of West Fremont Street between Carlton Avenue and Buena Vista Avenue, San Juan Avenue between West Fremont Street and the southern end of San Juan Avenue, and Buena Vista Avenue between Flora Street and the southern end of Buena Vista Avenue (Figures 1 and 2, Appendix A). The work included the installation of 12 direct push borings to collect groundwater samples, laboratory testing of collected water samples, and preparation of this report. All work conducted by Condor was performed under the supervision of a California Registered Geologist or Professional Engineer. This report includes project background information, a description of the field and laboratory procedures, analytical results,and recommendations. 2.0 PROJECT BACKGROUND In 1998, a study was performed on the Buena Vista/Smith Canal drainage area to identify factors contributing to flooding problems. The study proposed the installation of a new storm drain collection system and a pump station at the southern end of San Juan Avenue. Due to the presence of buried utilities beneath San Juan Avenue, the proposed location of the pump station was moved to the southern end of Buena Vista Avenue. Kjeldsen Sinnock Neudeck, Inc. retained Condor to conduct a Phase I ESA for portions of the right-of- way areas of Carlton Avenue, Field Avenue,West Fremont Street, Melbourne Avenue, San Juan Avenue, and Buena Vista Avenue in Stockton. The Phase I ESA was conducted to investigate the potential for environmental impacts to the right-of-way areas of these streets prior to construction of the new storm drain collection system and pump station. In the Phase I Environmental Site Assessment Report, Buena Vista Storm Drain Project, dated November 11, 2003, Condor reported that the right-of-way areas are located within an industrial/commercial area with known soil and groundwater contamination, and with historical use of hazardous materials and generation of hazardous waste. Condor concluded that there is a high potential for soil and/or groundwater contamination in the right-of-way areas from properties on San Juan Avenue,West Fremont Street,Field Avenue, Carlton Avenue, and Buena Vista Avenue. Condor prepared the Phase II Environmental Site Assessment Work Plan, dated February 7, 2005, for submittal to the San Joaquin County Environmental Health Department (SJCEHD). Margaret Lagorio of the SJCEHD verbally approved the work plan on February 18, 2005. �� CONDOR