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540 West Scotts Avenue • Se•mber 8, 1998 <br /> Project 9644 page') <br /> 4. The boring holes were then measured and it was determined that <br /> there was less than 10% cave in in any of the holes and the total <br /> depth of each boring was about 40 feet. Approximate 10 feet of <br /> water remained in hollow stem auger. <br /> 5. Neat cement grout (five sacks of cement to approximately 20 gallons <br /> of water) was then pumped into the bottom of each of the drilled out <br /> wells using the hollow stem auger as a casing. The auger , was <br /> withdrawn as the grout was placed in such a manner as to prevent <br /> voids from occurring. After all the auger was removed, each boring <br /> was topped off. The site was then finished off to match the adjacent <br /> sidewalk. <br /> 6. The soil, casing and vault from each of the wells were then disposed <br /> of as construction debris. <br /> As required by the terms of the State of California Department of Water Resources, <br /> Form 188 for the monitoring well destruction has been completed and filed as <br /> required as well as attached to this letter. <br /> If there are any ✓ °ess� call. <br /> Sincerely, " 2 <br /> No. 23772 M <br /> Exp. 12.31.99 <br /> �f IV1� <br /> Jo Carver AlF OF CA��FOQ� <br /> Civ i Engineer 23772 <br /> William Dubovsky <br /> President <br /> WILLIAM DUBOVSKY ENVIRONMENTAL <br />