LPPD000384 - Laserfiche WebLink

Home Browse Search

.~.."'.---. . ;,----- . i\ :f?:> . . ontO adjacent private property to achieve a total storage capacity of approxi~ mately 18 acre/feet A new diversion point wo~d be needed on the River ap- proximately 200' north of the Lake to fill the expanded volume. A new transmission system consisting of a pumping facility at the Lake and a pipe line from the Lake totbe existing water treatment plant would convey ~w water to the plant, at which point a surge tank will be constrUcted to receive and modulate incoming trB'nmtission flows. The water treatment plant constructed in 1.993 utilized mixed media pressure filters,. with alum' as the coagulating agent prior to fIltration. This required an on-site'storage pond to receive the alum' laden backw~h from the.fIlterswhich ' was an ongoing nuisance since it had to be periodically hauled off to very re- stricted landfIll sites authorized to receive such material. This, in combination with anticipated stricter tur'Pidity stimqards, caused the District to .repiace the mixed media pressure filters in April of 2000 with the micro-filtration pro- cess as manufactured by the U.S,' Filter Company, and a~ earlier descibed in the EXISTING FACILITIES Section of this report. This has resulted in a . more efficient operation of the treatment plant and an improved fInished pro- duct. While the mixed media filteratid alum system can always be considered as an option, it was dismissed as a viable' alternative given the improved efficiency and the higher degree of trea1ment inherent in the micro-filtration process. . The upgrade of ,the water treatment plant in Alternate "A" will consist of the . addition of a new micro-filtration unit of the same capacity as th~ existing un- it, to be pJaced in available space adjaceIit to the existing unit inside' the treat- , ment plant building. t\LTERNATE "B"-ENLARGE CRESCENT ~E AND BUlLD A NEW WATER TREATMENT PLANT.. . .. ' . Crescent Lake will be expanded in the same manner as in Alternate "A", along with the new diversion point on the River. Instead of conveying raw water from the Lake to the existing water treatment plant as described in Alternate "A", a new treatment plant will be constructed at the Lake equipped with high service pumping facilities to deliver treated water to the low zone of the distribution at that particular location.In this re-' gard, a certain segment of the distribution system Will be replaced with a lar- 'ger diameter line leading away from such high service pumps to minimize 'Op- erating pressures in that segment . 12