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Measurement and Payment <br /> No measurement for payment shall be made for mobilization and demobilization. A lump sum bid <br /> for mobilization and demobilization shall be reflected under Item 1 of the Bid Schedule. Payment <br /> of two-thirds of the lump sum price will be made with the first monthly progress payment after <br /> completion of the work described above for mobilization. Payment of one-third of the lump sum <br /> price will be made with the final progress payment for the work if demobilization has been <br /> completed. If the price bid for mobilization and demobilization is greater fifteen percent (15%) of <br /> the total contract price, invoices supporting the mobilization costs will be required before payment <br /> is approved. <br /> ITEM 2- SLOPE DRAINAGE CONSTRUCTION <br /> A maximum 3:1 (H:V), eight(8)foot wide, eight (8) foot high drainage course will be constructed <br /> from the staked location in the field upwards to a location which will day-light on the bench. The <br /> drainage will be constructed according to the attached Drawing 1, Slope Drainage Course Cross <br /> Section and Plan View. The bottom of the.drainage course will be lined with a minimum 30"depth <br /> of riprap. Riprap, available on-site,will consist of a combination of 20% minimum 4' diameter rock, <br /> 40% minimum 2'to T diameter rock and 40% 12"to 18" rock. The 4' diameter rock will be keyed <br /> into the bottom of the constructed 3:1 channel through excavation placement to not extend above <br /> ground more than 30"high and placed every 20' in slope length. The 12"to IV'rock will be placed <br /> and compacted into the bottom of the excavated channel. The 2'to 3' diameter rock will then be <br /> placed over the smaller rock to fulfill the 30" minimum riprap depth requirement. Placement will <br /> be from the lowest portions progressing upslope. Placement will be such that voids will be <br /> eliminated to the best extent possible with rock contacting rock. Side slopes to the constructed <br /> channel will be at a maximum 3:1 slope. Side slope riprap will consist of an evenly distributed <br /> combination of 50% minimum 24" diameter rock and 500/6 12"to IV' diameter rock. Side slope <br /> riprap will extend up the sides of the constructed channel to a minimum 48" height. Contour <br /> furrows that are eliminated as a result of drainage construction will be reconstructed to tie into the <br /> drainage course, parallel to contour. (Note: the initial method of contour fuffow construction was <br /> by the downward blade action from a smaller dozer that was facing downslope, progressing up <br /> slope towards the bench.) <br /> The highly eroded drainage gully which exists downslope from the staked location to the slope <br /> break at the base of the grade will also be constructed to conform to Drawing 1, Drainage Course <br /> Cross Section. <br /> Material as a result of drainage course construction may be excavated and hauled to a terrace <br /> location located to the north east of the sediment pond as delineated in the field, or placed against <br /> the excavated bench cuts. it is assumed that the terrace location will be used for excavated � y <br /> material from the lower portion of the drainage course construction. Prior to depositing excavated <br /> material at either the terracelocation or against the excavated bench cuts, existing vegetation and <br /> soils to a 24" depth will be graded off and stockpiled. Final grade at the terrace location once <br /> hauling has been completed will not exceed a 3:1 slope in any direction. Stockpiled vegetation and <br /> soils will be evenly redistributed over the deposited material from drainage course constructio <br /> upon completion of earthmoving procedures. <br /> 7 <br />