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<br />1 <br /> small final siltation basin to remove any materials picked up <br />' by the surface runoff within the mined area. The pond outlet <br /> will consist of sheet flow across a riprap area into a natural <br /> drainageway within Basin B. This channel affects a total diver- <br /> sion of the natural offsite runoff and woy]~d be a permanent <br />~ ~ installation. `% <br /> 2. Within the beginning phases of the quarry operation, the surface <br />' and direr_ted to a <br />runoff will be collected in temporary channels <br /> AA <br />~ <br /> detention / siltation basin as shown in Figure <br />l <br />. The pond will <br /> l <br />be constructed approximately a[ elevation 6575. During the period <br /> of the operation when the quarry benches are excavated above this <br />' elevation, the temporary diversion channels will be constructed in <br /> the lower benches to collect the runoff from the quarried area and <br /> to direct the flows to the detention pond. During this interim <br />' phase, part of the channelization into the detention ponds will <br /> occur within the natural drainageway. When the quarry operation <br />h <br />fi <br />l <br />l <br />i <br />657 <br />l <br />f <br />h <br />d <br />i <br />l <br />i <br />i <br /> nage a <br />ve <br />s be <br />ow e <br />evat <br />on <br />5, t <br />e <br />na <br />stages o <br />t <br />e <br />ra <br />ternat <br /> is implemented as defined under Item-3 below. The configuration of <br />' the temporary channels is shown in Figure-3 and the detention ponds <br /> are shown in Figure-4. <br /> h <br />h <br />h <br />l <br />h <br />i <br />d b <br />i <br />b5 <br /> en t <br />e quarry operat <br />on <br />as progresse <br />elow e <br />on <br />en <br />3. W <br />evat <br />75, t <br /> localized depressions will be created within the quarry area. These <br />' depressions will collect the surface runoff from the mined area and <br /> retain the water which will evaporate and/or seep into the fractured <br /> rock zones. The drainage requirements for this phase wi.Ll consist <br /> mainly of creating Che positive drainage paths and sump areas to <br /> minimize the impact on the quarry operation. The permanent diversion <br /> channel defined under Element 111 is to be retained. The detention <br /> pond, defined under Element 112, will be eliminated.' <br />LI <br />1 <br />' -2- <br />