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_DRI CTORS• <br /> ROBF R T D HOWELL <br /> JAMfSH KLINFILDfR KILEINFELDER & ASSOATES <br /> CN RIL M MCRA( ROBERT A WILKINSO, <br /> GEOTECHNICAL CONSULTANTS 9 MATERIALS TESTING <br /> [ARLC KLEINFELDFR P NAIGUE L VIAR%f S <br /> MICHAEL IF MAHOSIN 282;IASi WRILI <br /> RICHARDM "ARY <br /> NTO(1,10% (A'!;20_, <br /> it If PHV,t 44B I w; <br /> File No. S-1773-1/#244 <br /> October 22 , 1982- <br /> Konig & Foor, Inc. <br /> Suite 305-Wells Fargo Bank Building <br /> 305 North El Dorado Street <br /> Stockton, California 95202-2398 <br /> Attention: Mr. Richard W. Konig <br /> Subject: SUMMARY OF BACKFILLING OPERATIONS <br /> LABORATORY TESTING <br /> FORWARD, INC. <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> Gentlemen: <br /> This letter is to summarize the backfilling operations of <br /> four test holes at Forward, Inc. , in San Joaquin County, Calif- <br /> ornia. Our work was performed based on your written authori- <br /> tion on September 28 , 1982. <br /> On October 4 , 1982, a representative of our firm backfilled <br /> the west hole of the north pond with 3/8-inch pea gravel and <br /> a slurry mixture of approximately 85 percent bentonite and 15 <br /> percent cement. The slurry was of moderate consistency and* * <br /> - <br /> did not appear to percolate sufficiently through the pea gravel. <br /> At the suggestion of Mr. Eagle, we left the site and obtained <br /> 3/4-inch concrete aggregate. Upon returning to the site, the <br /> remaining three holes were backfilled to approximately 3-1/2 <br /> to 4 feet below existing ground surface. The 3/4-inch aggre- <br /> gate allowed 4 to 5 gallons of relatively thick slurry mixture <br /> to percolate and fill the holes. <br /> On October 8 , 1982, the three holes containing the 3/4-inch <br /> aggregate were backfilled to the surface using clay soils ob- <br /> tained adjacent to the site. These holes were backfilled <br /> according to specifications outlined in your letter of September 28, <br /> 1982 . The remaining hole containing a bentonite plug above the <br /> pea gravel was drilled out to approximately 6 feet below ground <br /> surface. Clean pea gravel was not encountered; therefore, it <br /> appeared that the bentonite slurry had partially mixed with the <br /> pea gravel. Additional slurry was poured into the hole until <br /> evidence of percolation ceased. This hole was then backfilled <br /> to the surface with the clay soils . <br /> EK <br />