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3/9/2010 <br />Secondary Clarifier Improvemen <br />o Secondary Clarifiers <br />• Install new baffle to improve <br />treatment efficiency and <br />reduce risk of violation <br />• Clearer effluent reduces <br />chemical addition <br />• Replace worn mechanism to <br />reduce O&M costs <br /> <br />Digesters -Existing Conditions <br />o Digesters No. 2 and <br />No. 3 built in 1938 <br />o Digester No. 1 <br />constructed in 1947 <br />o Interior concrete <br />deteriorated by <br />exposure to sludge <br />o Existing steel roofs <br />are not insulated <br />11 <br />