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05 January 2018 AdvancedCveo <br /> AGE Project No. 14-3154 f= n v i r o n r7-i e n t a l <br /> Page 6 of 9 <br /> potential contamination from the former buried waste; and to further assess and define <br /> the limits of the waste cells. For this investigation, the proposed scope is as follows: <br /> • Permitting and pre-field work activities; <br /> • Soil boring advancement and soil sample collection; <br /> • Sample Analysis; and <br /> • Report preparation including an updated Site Conceptual Model of the site. <br /> Each of these tasks is described in greater detail below. <br /> 4.1. PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment permits will be obtained from the San Joaquin County <br /> Environmental Health Department(SJCEHD). In addition, a health and safety plan will be <br /> updated in accordance with Occupational Safety and Health Guidance Manual for <br /> Hazardous Waste Site Activities (National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). <br /> Prior to mobilization, each proposed boring location will be clearly marked and a utility <br /> clearance obtained through Underground Service Alert. <br /> 4.2. SOIL BORING ADVANCEMENT AND ANALYSIS <br /> Confirmation Soil Borings <br /> Based on the approximate dimensions of the waste cells (Figures 3 through 5), AGE <br /> proposes to advance eight (8) soil borings in the former North Waste Cell to total depths <br /> of 15 feet bsg, and nine (9) soil borings in the former South Waste Cell to total depths of <br /> 12 feet bsg. Soil borings will be advanced in a grid pattern that will consist of one soil <br /> boring for approximately every 400 square feet of area in each former waste cell <br /> (Figure 3). <br /> The scope of work is proposed to evaluate soil under the imported backfill material for <br /> chemicals of concern (dioxin and furan; and PCBs). Soil boring locations are depicted in <br /> Figure 3 and in cross-sectional view in Figures 4 and 5. All borings will be advanced <br /> utilizing a van-mounted direct push drilling rig equipped with 1.5-inch probing rods. Soil <br /> borings will be advanced to approximate total depths of 15 feet bsg in the North Waste <br /> Cell area and 12 feet bsg in the South Waste Cell area for collection of one (1) soil sample <br /> at the termination of each boring. All soil samples collected will be analyzed for <br /> dioxin/furans and the full list of PCBs. Additionally, soil samples collected from two <br /> borings in the North Waste Cell and three borings in South Waste Cell (a minimum of 25 <br /> percent of all samples) will be analyzed for all the constituents listed below. <br />