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<br />TABLE 5.1 - O""NTION BEQUlBEMENT,OR~f1 <br /> <br />BASIN <br /> <br />DETENTION REQ. BASIN DETENTION REQ. <br />MANDATORY CASE BY CASE MANDATORY CASE BY CASE <br /> <br />sawmill X <br />Illinois X <br />Jones <br />Lomax X <br />Klack X <br />E-1 X <br />E-2 <br />E-3 X <br />E-4 X <br />E-5 X <br /> <br />X <br /> <br />E-6 <br />E-7 <br />W-1 <br />W-2 <br />W-3 <br />W-4 <br />W-5 <br />W-6 <br />W-7 <br /> <br />X <br /> <br />X <br /> <br />X <br /> <br />X <br />X <br />X <br /> <br />X <br /> <br />X <br /> <br />X <br />X <br /> <br />WATER OUALITY <br /> <br />In the process of developing the Drainage Master Plan, several <br />locations where regional water quality facilities could be <br />constructed and provide major benefit were identified. In general, <br />the regional facilities are preferable to widening dispersed ones <br />constructed on individual developments. The main advantage is in <br />maintenance since it is difficult to keep the small facilities on <br />private land adequately maintained. The regional facilities could <br />be paid for by assessing the future development with a portion of <br />the cost proportioned to what its on-site quality control <br />requirements would have been. <br /> <br />The potential regional facilities are identified below. <br /> <br />1. Klack Basin - Several facilities should be <br />constructed along the main drainageway. The <br />detention structures identified under <br />prioritized improvements could serve as water <br />quality control facilities if properly <br />designed. <br /> <br />2. Basin E-5 - A pond could be constructed <br />prior to the confluence with the Blue River. <br /> <br />3. Lomax Gulch - A water quality control <br />facility between Ski Hill Road and the <br />confluence of the Blue River would be extremely <br />valuable. Lomax Gulch conveys a considerable <br />amount of sediment due to steep roadside <br />ditches, the nature of the soils and scars left <br />from hydraulic mining activity. <br /> <br />50 <br />