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t <br /> California Modified split-spoon sample chamber which held 211 OD <br />' metal sleeves <br /> While the above rig was preparing to begin work, a second smaller <br /> rig arrived for drilling location 11D" , (monitoring well #4 ) <br />' After removing an overhead portable canopy, the rig was moved <br /> into position and began drilling at about 1000 hours . Don Light <br /> assisted the geologist in handling cores, since two rigs were <br /> working at the same time <br /> Field protocol consisted of the following general procedures - <br /> 1 After reaching the desired depth, a clean split-spoon sampler <br /> was lowered into the auger flights - it was thoroughly cleaned by <br /> washing in Alconox, and double rinsing in clean water The metal <br />' sleeves were cleaned by the same procedure The core barrel was <br /> driven to the desired depth, retreived and delivered to the <br /> geologist for examination <br /> 2 . The sample chamber was carefully opened & the metal sleeves <br /> containing the cored material were placed on a clean surface . <br /> Recovery was noted, and the lithology described and recorded <br /> 3 One of the tubes was preserved for analysis by promptly <br /> sealing each end with teflon tape & plastic end caps Both ends <br />' were then secured with duct tape, the tube was clearly labeled & <br /> placed on ice in a sealed chest for preservation <br />' 4 . A portion of each core was placed in a ziplock bag, labeled, <br /> and set aside for screening with a PID meter which had been field <br /> calibrated prior to use After setting for 10-15 minutes, the <br /> probe of the meter was inserted into the bag, and the meter <br /> reading recorded. <br /> 5 Drill spoils and unused core material was placed in metal <br /> drums, tightly sealed, and stored on location pending later <br /> disposition. <br /> Soil samples were taken at 51 intervals from 151 bgl to 451 bgl <br /> I in soil boring 11C11 (MW-5 , ) refer to PLATE VI for details of blow <br /> counts, recovery, lithology, & other pertinent details After <br /> retrieving the last core, the augers were advanced to 551 bgl <br /> 211 OD Schedule 40 blank & perforated flush screw joint casing was <br /> made up, lowered into the auger flights & landed at 551 bgl The <br /> bottom was fitted with a solid cap, with 020t1 shop made slots <br /> extending from 551 to 351 , the remainder of the casing was blank <br /> The annulus was packed with 8 1/2 sacks of #2/12 SRC graded sand, <br /> which extended to 321 , 31 above the top of the screen 1/2 bag <br /> 5 <br />