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Measurement and Payment <br />No measurement for payment shall be made for mobilization and demobilization. Alump 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 3' 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 18" 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 50% 12" to 18" 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 furrow 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 <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 construction <br />upon completion of earthmoving procedures. <br />7 <br />