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P. <br /> • 4; <br /> r <br /> SCOPE OF WORK IJ" <br /> SUBSURFACE SITE ASSESSMENT <br /> SERVICE ST IO 1 <br /> PURPOSE <br /> The purpose of work as outlined is to .provide a subsurface <br /> assessment of the presence of petroleum hydrocarbon <br /> tcontamination in the soil and/or groundwater at the. Thrifty <br /> Oil Co. Service Station #171 'located at 1250 North Wilson Way <br /> ' @ Harding Way in Stockton, CA 95200. <br /> ON TOR <br /> M I ING WELLS <br /> r ' Install 3 monitoring wells• in the approximate areas as shown <br /> on the attached site plan. Wells shall extend at least 20 <br /> Mfeet below groundw-ter or to a maximum of 50 feet depth. <br /> Construction of wells shall utilize 4" PVC . casings and be <br /> ' installed in accordance with Section 2647 and 2648 of the <br /> State of California_ Underground Storage Regulations dated <br /> August 1985 and in compliance with local agency requirements <br /> and permits. <br /> ' SAjaLR COLLECTION <br /> Samples shall be ccllected at 5., 10, 15, 20, 25, 30, '35 and <br /> ' .40 foot intervals or at soil-water interface in each boring <br /> ' advanced for monitoring well installation. Borings shall be <br /> # described in detail using the Unified', Soil Classification <br /> System. Samples shall be taken and handled per EPA Chain-of- <br /> F <br /> Custody -procedures. Sampling at .a minimum shall be in <br />