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GROUNDWATER Ml= O K PLAN AREA 16 424 NOR VAN STREET Stockto -Ca! 0 !,a-- 1.0 ij 1.0 INTRODUCTION This work plan describes the installation and monitoring of four groundwater monitoring wells to be located at 423 Madison Street in Stockton, California, also known as Area 15 (Site) (f=igures 1 and 2). The City of Stockton (City)owns the Site which has been part of the Stockton Event Center Redevelopment Project(Event Center). The San Joaquin County Environmental Health Department (SJCEHD) recently requested that a groundwater monitoring work plan be submitted to the SJCEHD by 9 October 2009. Subsequently, Treadwell&Rollo, Inc. (T"&R) was retained by the City to prepare this work plan. The objective of the proposed groundwater monitoring is to help delineate the concentrations and extent of groundwater impacts related to the former underground storage tank(UST) area and to help evaluate the need for additional monitoring and remedial measures. 2.0 SITE DESCRIPTION AND PREVIOUS INVESTIGATIONS The Site is part of the Event Center Redevelopment Project, which includes the area north of the t , Stockton Channel bounded by North Lincoln Street to the west, West Fremont Street to the north and Commerce Street to the east(Figure 1). The lead agency for Environmental issues at the Event Center is the California Department of Toxic Substances Control (DTSC),but the SJCEHD, under their local oversight program (LOP) is continuing to oversee four areas with UST releases at#ree the Event Center. The additional three areas are the adjacent properties located at 424 Van Buren Avenue (also known as { Area 16), 420 Madison Avenue (also known as the former Carando Machine Works), and 404 Fremont Street(also known as the former Crystal Creamery) (Figure 2). The Site was originally developed in the early 1900s and redeveloped in the 1950s for use as an auto repair facility. All structures at this parcel were demolished prior to remediation in March 2004. The northeastern portion of the Site is mostly paved and'used for parking while a portion of the Stockton Arena is located on the southwest portion of the Site. Due to the former presence of underground storage tanks(USTs), the Site is currently enrolled in the State Underground Storage Tank Cleanup Fund (USTCF). II I