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15 May 2019 <br />AGE Project No. 14-3002 <br />Page 6 of 17 <br />4.1. DRILLING AND SOIL SAMPLING <br /> <br />On 02 April 2019, pilot soil borings for installation of wells MW -1 through MW -4 were <br />advanced to total depths of 20 feet bsg utilizing a Landra L-10 (CME-75) limited access <br />drill rig (LAR) equipped with 8.25-inch diameter hollow-stem augers. Drilling services <br />were provided by Slagle Drilling of Rancho Cordova, California. <br /> <br />Soil samples were collected from pilot borings MW -1 through MW -4 at five-foot intervals <br />beginning at 5 feet bsg and extending to the total depths. All soil samples were collected <br />ahead of the drill bit using a California modified split-spoon sampler loaded with three pre- <br />cleaned 2-inch by 6-inch stainless steel sleeves. The number of blows required to drive <br />each 6-inch length of the sampler (blow counts) were recorded on boring logs by an AGE <br />geologist. Boring logs are presented in Appendix D. <br /> <br />All soil cuttings and rinseate generated during drilling activities were placed in Department <br />of Transportation (DOT)-approved 55-gallon drums, covered, labeled and stored on-site <br />pending proper waste disposal. Monitoring well locations are depicted in Figure 2. <br /> <br /> <br />4.2. LOGGING <br /> <br />During drilling activities, soil sample duplicates from pilot borings MW -1 through MW -4 <br />were monitored for the presence of organic vapor using an OVM and were visually <br />described on the boring logs in accordance with the USCS. Boring logs documenting <br />lithologic observations and well construction details from wells MW-1 through MW-4 are <br />included in Appendix D. <br /> <br /> <br />4.3. LABORATORY ANALYSES OF SOIL SAMPLES <br /> <br />After sample recovery, both ends of a selected soil sample sleeve were covered with <br />Teflon sheets, capped and sealed with tape. Sample sleeves were labeled (sample name, <br />location, time, date and samplers initials), stored on ice, and transported under chain-of- <br />custody to ASC. Selected soil samples were analyzed for the following constituents: <br /> <br />• TPH-g, TPH-d, and TPH-o in accordance with EPA Method 8015M. <br />• VOCs in accordance with EPA Method 8260B. <br />• CAM 17 Metals TTLC in accordance with EPA Method 6010B/7471A. <br /> <br /> <br />4.4. WELL COMPLETION <br /> <br />Pilot soil borings for wells MW-1 through MW -4 were completed as groundwater <br />monitoring wells using 2-inch diameter, schedule 40 polyvinylchloride (PVC) blank well <br />casing and 2-inch diameter, 0.020-inch slotted well screen. Well screens were installed <br />from 5 feet to 20 feet bsg.