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Our Job 81-20-00 Page A- 1 <br />APPENDIX A <br />SUPPOR.T I NG DATA AND PROCEDURES <br />EXPLORAT I ON <br />Exploration at the site, suPPlemented by a review of <br />available reports, consisted of four exploratory dri1l holes ranging <br />in depth fron ?L to 31 feet. The estimated locations of these <br />dri1l holes are shown on Plate 2.. The drilling was acconplished <br />using a truck-mounted, rotary-wash dri11 rig. <br />The dri1l holes were logged by an engineer, and "undis- <br />turbed" samples were taken at various selected depths. The "undis- <br />turbed" sanples were taken using a 3.375-inch outside diameter <br />drive sampler which contains a 2.625-inch inside diameter, brass <br />sanple sleeve, eight inches in length. All sanples are capped <br />and seal.ed immediately upon extraction. A bulk sample of repre- <br />sentative surficial soil type was also taken. The "undisturbed" <br />sampling was supplemented with standard Penetration testing. <br />The logs of each dri11 hole are presented as Plates <br />A-1.1 through A-1.4 - Log of Dril1 Ho1e. The geologic and engi- <br />neering field descriptions and classifications which appear on <br />these logs are prepared according to Corps of Engineers and <br />Bureau of Reclanation standards. Major soil classifications are <br />prepared according to the Unified Soil- Classification System. <br />Since the description and classification which appears on the <br />Log of Dri1l Hole is intended to be that which most accurately