REV08430 - Laserfiche WebLink

Home Browse Search

San Luis Froiect F..3 DIVERSION CHANNELS E.3.1 Diversion Channel This Specification Section describes the work related to construction of the diversion ehanrtels. Diversion channels outlined in the Drawings shall be constructed by excavation and fill placement. Diversion channel depths and side slopes shall be as detailed in the Drawings. Fill placement for diversion channel constnu:tion shall be conducted as approved by the Field Engineer, E3.1.1 Riprap The ripmp shall be reasonably well graded and conform to the minimum brain size distribution resented in Table 3. The riprap need not be compacted. 12iprap shall be placed to grade in a manner that ensures uniform layers of riprap of the specified thickness. The lazger rock fragments shall be uniformly distributed and the smaller rock fragments shall Serve to fill the spaces between the lazger rock fragments in such a manner as will result in a wellFkeyed, densely placed Iayer. Hand placing will be required only to the extent necessary to secure the results specified above. Constructed features shall be constructed to within 0.1 foot of the lines, dimensions, and elevations as designed and shown on the brawzngs. E.3,2 Filter Fabric Filter fabric shall have a m;n;mum weight of 8 ounces per square yazd. The filter fabric shall be placed on the compacted channel subgrade prior to placement of riprap. The edges of the filter fabric shall be keyed into the basks of the channel a m;n;mum of 6 inches a5 shown on the Drawings. The filter fabric shall be laid with the upgradient piece overlapping tlhe downgradicnt section by a minimum of one foot. E.3,3 Gabions The diversion channels with median riprap sizes lazger than 12 inches shall be 1vned with gabion baskets and covered with grout. E3,3.1 Gabion Baskets Gabion baskets shall be supplied by Maccaferri Gabions, Tnc. or an approved equivalent. The baskets shall be constructed of heavily galvanized, steel wire mesh of double mexagonal weave with opening dimensions of approximately 3 by 4 inches. Dimension of the gabion baskets shall be 3 feet wide, either 9 or 12 feet long, and either 18 inches or 12 inches thick depending on the location. Segments 18 and 16 shall have 12-feet long and 18-inch thick baskets, and segments 12 and 5 shall have 9-feet long and 12-inch thick baskets. The gabions shall be filled with riprap in the size range from 3 inches to 12 inches in diameter. Banle Mountain Resources, (nc. Draft Shepherd [Nilier, loc. N_~~e~parivego07G'/rmzancngav2.aa E ' ~ .Sep[rmbtr 1999 B [ 'd 595 'ON X~d ~ LE~9i NOW 66-1Z-d3S