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ADDITIONAL PHASE H ENVIRONMENTAL SITE ASSESSMENT REPORT Buena Vista Storm Drain Stockton,California August 15,2005 1.0 INTRODUCTION This report was prepared by Condor Earth Technologies, Inc. (Condor) to describe additional Phase II Environmental Site Assessment (ESA) activities conducted on July 26, 2005, for the Buena Vista storm drain project at the request of Kjeldsen Sinnock Neudeck, Inc. (KSN) (Figure 1, Appendix A). 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. During a Phase II ESA conducted on March 15,2005,methyl tertiary-butyl ether(MTBE)was detected in a groundwater sample collected from the boring (GP-5) installed in front of the property located at 1930 West Fremont Street. The purpose of the additional Phase II ESA was to further investigate the groundwater contamination present in groundwater near boring GP-5. The area investigated (Site) was located in the City of Stockton right-of way on West Fremont Street near the location of the previously completed boring GP-5 as shown on Figure 2, Appendix A. The work included the installation of four direct push borings to collect groundwater samples, delivery of the groundwater samples to a laboratory for analyses, and preparation of this report. All work conducted by Condor was performed under the supervision of a California Professional 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. KSN 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. �a CONDOR