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<br />002243 <br /> <br />Durango Pumoing Plant - Stage] <br /> <br />( <br /> <br />b. <br /> <br />N5W to N20W, and dips 67 to 82 degrees northeast. The joints are widely <br />to very widely spaced (1.0 to 5.0 feet). Another joint set strikes from <br />N74W to N80W and dips between 65 and 85 degrees northeast. A third <br />joint set strikes from N75W to N88E and ranges from vertical to a dip of <br />65 degrees southeast. The latter two joint sets are very widely spaced (3.0 <br />to 10.0 feet) to extremely widely space (greater than 10.0 feet). <br /> <br />Adjacent to an exposure offault F-l near the bridge on U.S. Highway 550, <br />a prominent joint set in the Menefee Fonnation strikes from N32E to <br />N68E and dips 44 to 52 degrees southeast. The joints are moderately to <br />widely spaced (0.9 to 3.0 feet), and open to about 0.3 feet at the surface. <br />A prominent joint set in the Point Lookout Sandstone at this location <br />strikes from N4E to N1 OE and dips 61 to 70 degrees northwest. These <br />joints are closely to moderately spaced (0.3 to 1.6 feet). <br /> <br />Joints which are tight to moderately open (0.003 to 0.01 feet) were <br />encountered during drilling of the weathered zone usually within the top <br />ten feet of rock. The joints are often iron stained with occasional coatings <br />of gypsum, calcite, or pyrite. Joints at greater depths are mostly tight as <br />confirmed by drill hole permeability testing. <br /> <br />Ajoint survey was performed in April 1996 near the intake of Durango <br />Pumping Plant. The survey was located along the Animas River bank <br />below high water line within the Point Lookout Sandstone. All joints <br />were measured which intersected a line approximately 245 feet long with <br />a bearing of approximately N40W. An additional 5 joints located on an <br />outcrop above the survey line were also measured. The approximate <br />location of the joint survey is shown on drawing No. 69-529-5 and the <br />data is summarized in Table 00320B below. <br /> <br />Table 00320B <br /> <br />c, <br /> <br />d. <br /> <br /> Table 00320B - JOINT SURVEY - APRIL 1996 <br />#of Distanc Strike/dip Spacing Continuity Openness Roughness Moisture <br />joints e <br /> (feet) <br />I] 3-22 N73-80W, 62NE- SP3 ave. C2 02 surface R3-R4 und MI-2 <br /> vert ]' 00 depth <br />3 7-8 N3-9E, 72-88NW SP4 CI 00 R4pln MI <br />1 3 N77E, 24SE Bedding plane <br />I 10 N80E, 16SE Bedding plane <br /> 22-29 covered <br />5 44-54 N6-IOE, 82-88NW SP3-4 C2 00 R4pln Ml <br />14 54-79 N6-IOE, 82-88NW SP3-4 C2 00 R4pln MI <br />3 33-36 N55-65E, 82- SP3-4 CI 00-0] R4pln MI <br /> 85NW <br />2 32-34 N65-70W, 84NE SP3 C2 00 R4-5 pin MI <br /> <br />Geology <br />00320 - II <br />