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. CL <br />4. Aeration Sv5tern <br />Two in-lake hypolimncdc aeration units will b« created for Long Lake at the locations <br />indicated in Figure 6. An in-lakc aeration urit is shovk-n concepeuaUy in Figure 8. The <br />system wiH incorporate a Und-l?ased air compressor which will supply air to the two m-lake <br />units. <br />Lon* Uke eompriaa two buini. *iule » primiry *o»J ii to reduce phoiphotu. <br />reieaje from jnoxic redimena in both, the use of two lendon unia wu je!e«ed. Thu will <br />incroue the ireal covert*e of -Jie system sitnificahtly and will ensure the lention of the <br />whole lake hypoUmnion. In iddicon. feme chloride, ii an iron source, will be supplied into <br />the lake hypolimnion. Thu wiU further reduce the phosphorus concennadon and ensure hi*h <br />phosphorus retention efficiency. <br />The aetanon system will be opented year-round to prevent anaerobic conditions in the lake <br />durmg the summer and winter months, and thereby reduce the high sediment phosphorus <br />loadinV The ferric chloride, on the ctiier hand, wiU be suppUed into the lake over the <br />seven- to eight-month open water season only.