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1 <br /> ' 24 March 2004 <br /> AGE-NC Project No 97-0301 <br /> ' Page 2 of 7 <br /> • 05 September 2003 - Soil boring for MW-11 advanced to 125 feet bsg, soil samples not <br /> collected during dnRing, boring completed as multi-level monitoring well MW-11 (A-D) <br /> q, a� <br /> • 09 September 2003 -Well development activities performed at wells MW-11 and MW_ � i Ir t$~ <br /> ' • 26 September 2003-Elevation and Global Positioning System(GPS)survey of wells MW-8 <br /> through MW-12 <br /> ' 2.4. DRILLING AND SAMPLING PROCEDURES <br /> Between 14 and 16 July 2003,multi-level ground water monitoring wells MW-8,MW-9 and MW-12 <br /> ' were installed on-site, between 03 and 05 September 2003, multi-level ground water monitoring <br /> wells MW-10 and MW-11 were installed off-site Soil borings for MW-8 through MW-12 were <br /> advanced vertically to maximum depths of 125 feet bsg utilizing a B-95 high torque,truck-mounted <br /> ' drill ng equipped with 8-inch diameter hollow-stem augers All soil cuttings generated from drilling <br /> activities were stockpiled in and covered in a 20 yard soil bin located in the south section of the site, <br /> soil boring/monitoring well locations are depicted in Figure 2 Ground water monitoring well <br /> lie <br /> installation procedures for the site were outlined in Feasibility Studies and Monitoring Well <br /> Installation Work Plan, dated 09 April 2002,prepared by AGE and approved by San Joaquin County <br /> Environmental Health Department(EHD)by letter dated 23 April 2002 (Appendix A) <br /> 21 SOIL SAMPLING <br /> ' Discrete soil samples were collected at 5-foot intervals from MW-8, MW-9 and MW-12 between <br /> 5 and 125 feet bsg and from MW-10 between 20 and 125 feet bsg Soil samples were collected <br /> ' utilizing a California split-spoon sampler loaded with 2-inch by 6-inch brass sleeves, the sampler <br /> was driven by dropping a 140-pound weight from a height of 30 inches The number of blows <br /> ' required to dnve each 6-inch length of the sampler(blow counts)was recorded on boring logs by an <br /> AGE staff geologist, boring logs are in Appendix B <br /> ' Due to upward heaving sands encountered during construction of off-site multi-level well MW-10, <br /> no sampling activities were performed during drilling for off-site well MW-11 Instead, the soil <br /> boring for MW-11 was advanced to total depth with a wood plug in the lead drilling bit, upon <br /> ' reaching the total depth,tap water was deployed in the hollow stem augers prior to knocking out the <br /> wood plug as a counter measure to the upward heaving sand <br /> ' Soil samples collected from soil borings MW-8, MW-9, MW-10 and MW-12 were preserved by <br /> covering both ends of a brass sleeve with Teflon sheets and plastic end caps and sealed with duct <br /> i <br /> ' Advanced GeoEnvironmental,Inc <br />