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E E E • moiraTs-aygn- Location: North County Sanitary Landfill CQA/Engineer-. Pete Holland, CEG Prepared by: PH Owner/Client: San Joaquin County Public Works 1W Ir'CTOR ENGINEERING. INC. Contractor: LFG Control Inc, Superintendent: Mark Penn (LFG) Submitted to: SJC Public Works Reviewed By: PH Project No., 03-16-0203-00 Day of Week: Monday Report Date: 7/27109 Time on Site: 7:00 am 7:00 am: Onsite. 7:30 am: Drillers arrived onsite (SG -11). Dan and Charlie (LFG) excavating around collar of SG -12 for placement of monument, concrete, etc. I told them hardpan was 2 ft deep based on cuttings. They were only planning to excavate 1.5 ft. After they realized they weren't constructing to plan specs they called Mark (LFG) and left to do another task. 8:00 am: Began drilling SGA 1. Top of hard pan at approximately 2.5 ft. At 11 ft depth drilling became much faster than SG -12 and most other holes. 9:00 am: Tim (Public Works) arrives. I told him about the hardpan situation at SG -12. 10:00 am: Mark (LFG) visits and says that he's got the go-ahead to move SGA 3 20 feet south from present location. 11:00 am: LFG gets clarification from Kevin (Public Works) that concrete does NOT need to extend down to hardpan. The specs had caused confusion. They will continue to place bottom excavation around well at 1.5 ft below grade. Mark (LFG) got approval from the County Public Works to move SGA 3 20 feet due south of proposed location, Natalia (Env. Health) let Mark know she needs verification that new location will be within 1000 ft of adjacent probes. 11:40 am: Drilling cuttings had been very moist At the end of drilling (75 ft) I dropped a depth -to -water probe down the hole to see if there was free water. The hole was dry. 11:45 am: In the presence of Natalia (Env. Health) the drillers and I measured the pipe lengths and perforation lengths. The deep probe had a perforated length of 33 ft. The specs indicated that it should have been 31.5 ft of perforations. The intermediate probe had 16 feet of perforations. The specs indicated it should have been 22.5 ft of perforations. The shallow probe was OK (3 feet of perf). We measured them again and confirmed the perforation lengths were off from the specs. I called Mark (LFG) to let him know. He arrived 10 minutes later with Dan, Laura and Charlie (all LFG) and they measured to confirm also. They suggested cutting off 1.5 ft from the bottom of the pipe to make it correct length of perforations. I expressed concern that the total pipe length would be too short, but they figured 79.5 ft (total length) —1.5 ft = 78 ft would be OK. LFG then cutoff 1.5 ft and refastened the weights and end cap and the drillers began constructing the deep probe. I measured the correct perforation length for the intermediate probe and placed a ribbon where the perforations should end. LFG drilled perforations to correct length. Natalia (Env. Health) was present during construction and noted the depth of gravel/bentonite.