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<br />~ ,~ .--' ,-, <br />t~\,., V ' <br /> <br />pass through five settling ponds (see Figure 10, Settling Ponds, <br /> <br />Nast Tunnel), and drainage of 50 gpm from the ~Hin Meadows aggre- <br /> <br />gate source, a "sunnner or~ly" operat.ion, is ncttled in t't-.'O poncl~. <br /> <br />All future contracts concErning the ""rth Side Coilection Syst~.." <br /> <br />will specify that commercial type poEution control systems will <br /> <br />be used in an effo::t to Incre6ls(' effi"iency. A mordtor~ng system <br /> <br />is in operation to insure polll1tion c.)ntrol is m"i"tained. Hea'.)' <br /> <br />mechanized equipment shall not be operated in flowing water except <br /> <br />as necessary to construct turbidity control structures or stre~m <br /> <br />crossings. <br /> <br />Construction operation .dll be conducted so that incre~..'e in <br /> <br />turbidity will be within limits specified b; loc~l, State and <br /> <br />Federal agencies. <br /> <br />t~en necessar.y to ?erform required construct~on operati0~D within <br /> <br />stream channels the contractor will be permitted to exceed the <br /> <br />specified turbidity limits for the shortest practical period of <br /> <br />time to complete the, work as approved by the Burer,u. These typ2 <br /> <br />of operations include diversion of rivers, construction or~d remov~l <br /> <br />of cofferdsns. specified channel excavation, haul road constr~~tion <br /> <br />and river channelization for turbidity cont~ol pur?oses. <br /> <br />55 <br />