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SIERRA DELTA CONSULTANTS, LW <br />935 Riverside Avenue, Suite 21 <br />Paso Robles, California 93446 <br />Phone: 805-239-9293 <br />Fax: 805-239-9309 <br />Email: sierradelta .ttsbeejoixtl.net <br />5070 N Sixth Street, Suite 152 <br />Fresno, California 93710 <br />Phone: 559-229-1451 <br />Fax: 559-229-1452 <br />Email: sierradeltzua sbcglobal net <br /> <br />Robb Eidemiller <br />President and CEO <br />January 22, 2009 <br />Ms. Margret Lagorio <br />San Joaquin County EHD <br />600 East Main Street <br />Stockton, California 95202 <br />Subject: Description of backfilling of boreholes at Waterloo Gas & Liquor located at <br />5611 East Waterloo Roag Stockton, California 95215, APN: 087-100-52 <br />(Subject Property). <br />Dear Ms. Lagoria, <br />As per our phone conversation, the specifics on the backfilling of the boreholes is <br />described below. <br />The two boreholes (northeast and southwest of the UST's) were punched through asphalt <br />to a depth of 25 feet below grade. These boreholes_wi.m Mita-with bentonite chips-to <br />approximately 6 inches below grade. A small amount of water was poured over/through <br />the chips to moisten. The last 6 inches were capped with Quikcrete® blacktop (asphalt) <br />patching material to match existing surface material. <br />The two boreholes south of the dispenser islands were cut through existing concrete and <br />hand augered to a depth of 5 feet below grade. Both of these boreholes were filled with <br />bentonite chips to approximately 10 inches below grade. A small amount of water was <br />poured over/through the chips to moisten. The last 10 inches were capped with <br />Quikcrete® Cement to match existing surface material. <br />If you should have any questions, please give me a call; 559-229-1451. <br />/4 <br />Kelly Gillogly <br />Project Manager <br />EXCE.393 - Borehole Backfill Description Page 1