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Project Inspection Request <br /> Page 2 <br /> configuration and the lower bowl left exposed to catch any surface flows that by-pass the <br /> upper bowl. <br /> Drainage B <br /> An excavation was made in a topographical low between two outcrops in a drainage path <br /> where surface flow had been observed (higher on the slope) to locate the subsurface flow <br /> along a rock outcrop. After exposing the flow, a 4 foot manhole was placed to intercept <br /> the groundwater flows. A drainage bowl to the manhole was constructed and shotcrete <br /> lined and the slope reconstructed. The outlet was connected (with 24" ADS pipe) to a <br /> second 4-foot diameter manhole placed to intercept any surface flows. The outlet from <br /> this manhole was extended to the lined diversion ditch on TPI with 24" ADS pipe <br /> (approximately 360 feet) for transport around the tailings material. <br /> Drainage_C. <br /> The drainage was followed upstream to a suitable site for installation of a drop structure <br /> and the entire flow appeared to be accounted for. An excavation was made and a 4-foot <br /> diameter manhole was placed. A bowl was constructed with the manhole as a drain and <br /> shotcrete lined. A 24" ADS outlet was extended to a lined diversion ditch constructed to <br /> divert surface flows around the east end of the Mayflower Mill facility. <br /> Diversion Ditches <br /> Two diversion ditches were constructed to carry intercepted drainage flows and runoff <br /> water around the site. One ditch traverses the hillside—tailings contact from Boulder <br /> Creek to the access road to the top of TP1 from the Mayflower Mill (approximately 2200 <br /> feet). This ditch will carry intercepted water from Drainages A and B, intercepted upland <br /> surface runoff from above TP 1 and surface runoff from the top of TP 1. The second ditch <br /> starts on the northeast side of the Mayflower Mill boundary and follows the access road <br /> upgradient to the drainage divide behind the Mayflower Mill (approximately 600 feet). <br /> This ditch will carry intercepted flows from Drainage C and intercepted upland surface <br /> runoff around the site. <br /> Both ditches are lined with 60 mil PVC with a soil cover and rock armor. Areas <br /> disturbed during construction have been recontoured and seeded with the MLR permit <br /> "Mountain Mix" designated for use in this area (seed mix attached). <br />