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<br />/__c.~ .", . <br /> <br />. <br /> <br />high pH and low pH water being delivered to the membranes. The waste <br />from this CIP is conveyed to a neutralization tank where it is treated, if <br />necessary, to attain the appropriate pH for discharge to an adjacentperco- <br />lation pond, and there is no discharge of any sort to the River. . , <br /> <br />The existing Memcor 6MIO-C micro-filtration unit was installed in April of <br />2000 to replace a mixed media pressure filtration system which was built in <br />1993, and used alum as the pre-filteroc.oagulating agent.This required an on- <br />site storage pond to receive the alum laden -backwash from the filters which <br />was an on-going nuisance since it had to be periodically hauled off to very <br />restricted landfill sites authorized to receive such material. <br /> <br />While mixed media filtration with alum can be considered as another type <br />of treatment, it was dismissed as a viable option for this project given the <br />higher efficiency and greater degree of treatment afforded by the micro- " <br />fiJtration system, particularly with regard to anticipated stricter turbidity <br />standards. <br /> <br />//:';-::<"'-. <br /> <br />.\ <br /> <br />As indicated earlier, the firm capacity of the Model6MlO-C is 32 gpm, in <br />winter conditions, and the addition of an identical unit raise~ the maximum <br />capacity of the expanded systemto 64 gpm. As discussed under "Alternate <br />A" in' Section VI of the Planning Document, this is consistent with meetiilg <br />the design flow of 50 gpm with some allowance to replenish treated water <br />storage., <br /> <br />Disinfection will be accomplished using existing hypo':'chlorination equip- <br />ment, but it is possible t:hat the District may eventually convert to gas chlor- <br />ination. Control ofpH"will done using existing caustic. soda feed facilities, <br />as required. <br /> <br />3) Treated Water Storage <br /> <br />Treated water storage will remain the same at 600,000 gallons in the low <br />zone, 20,000 gallons in the mid-zone, and 600,000 gallons in the high zone. <br /> <br />4) Pumping Stations <br /> <br />. <br /> <br />A new raw water pump station will be constructed on the site of the existing - <br />water treatment plant with a direct connection to the River. .A drought sce- <br /> <br />32 <br />