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Page 1 of 2 <br /> Nuel Henderson [EH] <br /> From: Orin Regier[ORegier@Geosyntec.com] <br /> Sent: Monday, September 28, 2015 3:50 PM <br /> To: Nuel Henderson [EH] <br /> Cc: Tim Davis; Caryn Quist <br /> Subject: Lincoln Center 9.27-28 <br /> Neul, <br /> The following well decommissioning activities were performed 9.28.2015: <br /> AS-51 (angled well): <br /> Dragged Depth - 68 ft bgs <br /> Total Depth Drilled—70 ft bgs <br /> Materials Removed—old cement grout,filter pack sand and 65 feet of casing excluding screen interval. <br /> Grout mix ratio-30 gallons of water with 8 bags of cement. <br /> Volume of grout used—approximately 170 gallons of grout tremmied down augers. <br /> AS-47(angled well): <br /> Tagged Depth- 60 ft bgs <br /> Total Depth Drilled—75 ft bgs <br /> Materials Removed—old cement grout,filter pack sand and approx. 60 feet of casing. <br /> / Grout mix ratio-30 gallons of water with 8 bags of cement. <br /> ✓/ Volume of grout used—approximately 200 gallons of grout tremmied down borehole. <br /> During drilling on 9.28 the augers became plugged and the augers began chewing up the casing of the well. In <br /> addition,the guide rods that were put down the well casing became stuck in the augers due to the well <br /> centralizers. In addition the drill rig then experienced a mechanical failure and lost rotation. The rig was sent in <br /> to the shop for repairs and on 9.29 the second drill rig hooked onto the augers and was able to pull them from <br /> the hole over the course of six hours on 9.29. In The driller stated that during the initial drilling the casing was <br /> broken and smashed and was included in the soil cuttings. <br /> SVMWE-002: qoul <br /> TD= 29ftbgs <br /> / 120 gallons of grout used to get grout to TOC(7 bags cement to 40 gallons water). <br /> Well successfully held 25 psi for 5 minutes and had less than two foot drop in grout level. <br /> Well mushroomed capped from 3ft bgs to 2 ft bgs,filled with native soil to 0.33 ft bgs and filled to grade with <br /> cold patch. <br /> SVE-034: <br /> Tagged Depth—9 ft bgs <br /> PVC Conveyance piping and well head cut and removed. <br /> Well obstructed by sediment and grouting cannot be performed. <br /> SVE-035: <br /> Tagged Depth—27.5 ft bgs , d <br /> RVC Conveyance piping and well head cut and removed. <br /> Z160 gallons of grout(mix ratio of 40 gallons water to 7 bags of cement) poured down the well to bring the grout <br /> lo the top of casing after pressurization. <br /> Well held a pressure of 25 psi for five minutes. <br /> 10/9/2015 <br />