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Treadwell&M&D <br /> A LANGAN COMPANY <br /> 5 April 2012 <br /> Project: 731589001 <br /> Ms. Lisa Medina <br /> San Joaquin County Environmental Health Department <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> Subject: Addendum to Work Plan <br /> Stockton Arena Hotel and Conference Center <br /> Stockton, California <br /> Dear Ms. Medina, <br /> As requested in your letter dated 21 March 2012 regarding the Former Chase Chevrolet located at <br /> 423 North Madison Street, Stockton, CA, we are submitting this addendum to our Groundwater <br /> Monitoring Work Plan. In that letter, you requested that we detail any changes to the work plan, <br /> language that defines the locations for the groundwater monitoring wells, and the reasoning for phased <br /> implementation at the two sites. <br /> Changes to the Work Plan <br /> No changes to the work plan have been proposed. Treadwell & Rollo (T&R) plans to install two <br /> monitoring well clusters on the 423 West Madison Property (formerly known as Area 15). Each well <br /> cluster will contain a shallow well at approximately 30 feet below the ground surface and deep well <br /> at approximately 55 feet below the ground surface. Three monitoring wells to be installed to a depth of <br /> 30 feet below the ground surface on the adjacent 420 West Madison Site (former known as the former <br /> Carando Machine Works) will be used in conjunction with the well clusters at Area 15 to measure <br /> groundwater gradients and Flow direction as well as provide additional control on the distribution of <br /> contaminants of concern. In your letter referenced above, you agreed with this approach: <br /> Locations for the Groundwater Monitoring Wells <br /> A site plan showing the location of the proposed monitoring wells is attached as Figure 1. The MW-15-1 <br /> cluster is located approximately 40 feet to the northwest of the former well MW-20A, 90 feet east <br /> measured orthogonally from Madison Street, and 185 feet south measured orthogonally from West <br /> Fremont Street. The MW-15-2 cluster is located in the middle of the large excavation area, approximately <br /> 80 feet south measured orthogonally from West Fremont Street, 175 feet east measured orthogonally <br /> from Madison Street, and 80 feet north measured orthogonally from the entry of the arena. <br /> i <br /> 555 MONTGOMERY STREET, SUITE 1300 SAN FRANCISCO CALIFORNIA 94111 T 415 955 5200 F 415 955 5201 www.treadwelfrollo.com <br />