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NOTE [hat Mobilization and Demobilization are not included as a separate line item. <br />CONTRACTOR shall include chazges for these items, if any, in the prices bid for the tasks <br />described below. No additional payment for Mobilization and Demobilization will be made. <br />Task 1 Low Water Crossings <br />The goal of this Task is to manage drainage of water on two of the of the old haul roads. In order <br />to accomplish this, two (2) low water crossings are to be constructed within the Project Area, one <br />on the Pit 4 Road, and one on the Pits 2 / 3 Road. <br />The Pit 4 Road low water crossing will be constructed immediately above the first switchback <br />located on this road. This crossing will serve to transport water from the north to the south side <br />of the road, and into an existing drainage swale. The other low water crossing will be <br />constructed at the first switch back of the Pits 2/3 Road. This low water crossing will allow <br />water to drain from the north to the south side of the road, moving the water into apre-existing <br />drainage swale. PROJECT MANAGER will mazk the location of each low water crossing in <br />the field prior to construction beginning. <br />Specif cations <br />The low water crossings shall be constructed to the specifications of Figure 1, Low Water <br />Crossing. The crossings will be constructed at about athirty-degree (30 °) angle to the axis of the <br />road, and will have a fall of five percent (5%) across the axis of each crossing. Ingress and <br />egress routes shall be no steeper than 6H: 1 V. The down hill slope of the crossings will be over <br />filled to accommodate anticipated volumes of water passing through the low water crossings. <br />The crossings shall be slightly longer than the width of the road above and below the crossing in <br />order to capture water from the ditch above each crossing, and in order to allow the water to <br />move into the pre-existing drainage swale below each crossing. Durable rock shall be placed at <br />the base and on the sides of each crossing. The rock shall be placed as a blanket with a coarse of <br />screened one-inch (1 ") underlying a coarse of screened two-inch (2") rock. A course of clean <br />four-inch (4") rock shall be placed over the other two (2) courses at the base of the crossing. <br />Durable rock rip rap shall be placed from the end of each low water crossing into the pre-existing <br />drainage swale for a distance of thirty feet (30') below the end of each crossing. The rock placed <br />in the pre-existing shall consist of two-inch (2") screened rock, overlain by clean four inch (4") <br />rock. The rock shall be placed within these channels, which aze approximately twelve inches <br />(12") wide at the base, and onto the side slopes for an additional twelve inches (12") per side, as <br />measured from the outside mazgin of the base of each channel. <br />Durable rock is defined as rock material which gives off a ringing sound when struck with a <br />hammer. <br />Measurement and Payment <br />Payment shall be made per low water crossing installed. Payment shall be made at the unit price <br />3 <br />