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PHASE II ENVIRONMENTAL SITE ASSESSMENT WORK PLAN Buena Vista Storm Drain Stockton,CA February 7,2005 1.0 INTRODUCTION This work plan was prepared by Condor Earth Technologies, Inc. (Condor) at the request of Kjeldsen Sinnock Neudeck, Inc., (Client) to describe a proposed Phase 11 Environmental Site Assessment for the Buena Vista storm drain. A new storm drain pump station is to be installed at the southern end of Buena Vista Avenue in the city of Stockton. A storm drain collection system will be installed to direct 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 this Phase H is to evaluate the potential for contaminants in groundwater that may be encountered during construction activities. The area to be investigated is 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 proposed work will include the installation of 12 direct push borings to collect groundwater samples. All work conducted by Condor will be under the supervision of a California Registered Geologist or Professional Engineer. This work plan includes project background information; a description of the field,laboratory,and reporting procedures proposed to conduct the work; and a project schedule. 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 Environmental Site Assessment (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�' - il� CONDOR