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'17 April 2003 <br /> AGE-NC Project No 97-0333 <br /> Page 2 of 7 <br /> • 08 October 2002 - Soil boring MW-12 advanced to 170 feet below surface grade(bsg)with <br /> no collection of soil samples, the soil boring was completed as multi-level monitoring well <br /> MW-12 (A, B, C, D, E and F) <br /> ' • 09 October 2002 - Soil boring MW-13 advanced to 170 feet below surface grade(bsg)with <br /> no collection of soil samples,the soil boring was completed as multi-level monitoring well <br /> MW-13 (A, B, C, D, E and F) <br /> • 21 October 2002 - Well development activities performed at wells MW-9, MW-11 and <br /> MW-13 <br /> ' • 01 November 2002-Well development activities performed at wells MW-7,MW-8,MW-10 <br /> and MW-12 <br /> • 10, 11 and 12 November 2002 - Initial ground water monitoring and sampling activities <br /> performed at multi-level monitoring wells MW-7 through MW-13 as part of the fourth <br /> quarter 2002 ground water monitoring activities <br /> • 22 November 2001 -Elevation survey of MW-7 through MW-13 <br /> lie <br /> 2.0. DRILLING AND SAMPLING PROCEDURES <br /> ' Between 26 September and 09 October 2002, multi-level ground water monitoring wells MW-7 <br /> through MW-13 were installed on-and off-site Soil borings MW-7 through MW-13 were advanced <br /> ' vertically to maximum depths of 170 feet bsg utilizing a B-95 high torque, truck-mounted drill ng <br /> equipped with 8-inch diameter hollow-stem augers All soil cuttings generated from drilling <br /> activities were stockpiled in and covered in two,20 yard soil bins located in the south section of the <br /> ' site, soil bonng/monitonng well locations are depicted in Figure 2 <br /> Ground water monitoring well installation procedures for the site were outlined in the AGE-prepared <br /> Work Plan Addendum, dated 03 April 2002 and approved by San Joaquin County Environmental <br /> Health Department (SJCEHD) by letter dated 12 April 2002 (Appendix A) <br /> 21 SOIL SAMPLING <br /> ' Discrete soil samples were collected at 5 foot intervals from MW-8 between 15 and 40 feet bsg and <br /> between 80 and 165 feet bsg Soil samples were collected utilizing a California split-spoon sampler <br /> loaded with 2-inch by 6-inch brass sleeves,the sampler was driven by dropping a 140-pound weight <br /> ' from a height of 30 inches The number of blows required to drive each 6-inch length of the sampler <br /> Advanced GeoEnvironniental,Inc <br />