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1 <br /> 1! HARGIS 1 ASSOCIATES, INC. <br /> Mr. Doug O'Neal <br /> March 26, 1991 <br /> Page 2 <br /> for pressure grouting of the drywell . The first 15 feet of the 2-inch diameter <br /> drill rods were easily pushed into the drywell . From 15 to 20 feet below land <br /> surface, the rods had to be driven to total depth. The driller indicated that <br /> based on the rig action during driving of the drill rod, the bottom of the <br /> drywell was located at a depth of about 19 feet below land surface. A <br /> bentonite\cement grout was then mixed and pumped into the drywell through the <br /> torch cut drill rod until the grout was observed at the surface. A total of <br /> approximately 37 cubic feet of cement grout was pumped into the drywell . After <br /> the drill rods were removed, approximately 4 cubic feet of cement was poured into <br /> the hand-dug portion of the drywell creating a cement cap approximately 1 foot <br /> below land surface. <br /> Please contact me if you have any questions on the drywell abandonment <br /> procedure. <br /> Sincerely, <br /> HARGIS + ASSOCIATES, INC. <br /> Terry M. Turner <br /> Senior Hydrogeologist <br /> R.G. No. 4500 <br /> TMT: sjm <br /> cc: Polly Lowry - Regional Water Quality Control Board <br /> Diane Hinson - San Joaquin County Health Department <br /> H. Derrick Peterson - Bryan, Cave, McPheeters « McRoberts <br /> John Delaney - Kearney National , Inc. <br /> Harry Mossberger - Kearney - KPF <br /> Dale Hinkle - Dale Hinkle, Inc. <br /> LTR75013.001 <br />