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<br />~ <br /> <br />~ <br /> <br />impoundments to draw off the supernatant or clear water from the pond <br />surface. A photograph of the Santa Maria Dam decant structure is <br />shown on the fo 11 owi ng page and in Appendi x F. The typi cal con- <br />figuration of a decant structure is a discharge pipe below the embank- <br />ment to di scharge the supernatant, and an i ncl i ned or vertical ri ser <br />tower that is constructed in discrete sections as the dam crest eleva- <br />tion is raised during placement of embankment fill. A horizontal <br />cross-section through a typical riser tower shows a square or rec- <br />tangular shape with concrete on 3-sides and wooden planks or bricks <br />progressively added to a fourth side. The photographs did not provide <br />a clear definition of the lOcation and specific details of the <br />structUre. The structure is a suspected mechanism for the seepage. <br />TherefC)re, the geotechnical and geophysical program was defined to <br />locate and provi de detail ed i nformati on on the decant structure as <br />well as the right abutment and ~bankment. <br /> <br />"III <br /> <br />~ <br /> <br />~ <br /> <br />j <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />b. Drilling, Sa~pling, and Testing <br /> <br />After defining the location, depth, and sampling and testing <br />program for each hole, several drillers were contacted to locate a <br />suitable rig that could complete the work promptly. Kuchler Drilling <br />of Montrose, Colorado was selected. They utilized a Mobile B-52 rig <br />specially adapted for either core or auger drilling, hollow and solid- <br />stem augers, coring rod, and permeability testing equipment. <br /> <br />Si nce the focus of the investigation was on seepage and <br /> <br /> <br />permeabi 1 i ty, co11 ecti ng undi sturbed samples from the embankment was <br /> <br />v - 4 <br />