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Page 1 of 1 <br /> Lori Duncan [EH] <br /> From : Randy Kirby [RKirby@clearwatergroup.com] <br /> Sent: Monday, January 31 , 2011 12: 19 AM <br /> To: Lori Duncan [EH] <br /> Subject: Proposed temporary dewatering wells -- 1817 S Fresno Ave, Stockton , CA -- Well completion <br /> design <br /> Lori Duncan, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> (209) 468-0337 phone <br /> (209) 468-3433 fax <br /> Dear Ms, Duncan : <br /> In regard to our discussion of the temporary dewatering wells planned for the referenced site, well completion <br /> is proposed as follows : <br /> Screen = 0.010 slotted PVC, from 20 to 35 ft bgs ( 15 ft screen) <br /> Sand pack = #2/12 sand, from bottom of boring to 2 feet above screen <br /> Seal = A minimum of 5 feet (or longer) of tremmie grouted bentonite slurry above the sandpack, with 30% solids <br /> and a non-jelling agent <br /> Cap = A minimum of 5 feet neat cement <br /> Traffic-rated well box. <br /> Sincerely, <br /> Randy E. Kirby, PG <br /> Senior Geologist <br /> Clearwater Group <br /> Environmental services <br /> 229 Tewksbury Avenue <br /> Point Richmond, California 94801 <br /> Tel : 510-307-9943 <br /> Fax: 510-232-2823 <br /> www.clearwatergroup.com <br /> 10/21 /2011 <br />