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0512612009 13:27 9518273349 DOUGLAS KUNEV PAGE 10/14 r E I maximum "full" level and an emergency spillway) should be provided between the settled embankment height and the bottom sof the emergency spillway. 'iW_o�StaQA IaQeQ19S Two-stage lagoons (Figure 2) require more total volume than sirA916-Mage lagoons, but effluent from the second stage will be of higher quality which is desirable when effluent is to be recycled for flushincr buildings. While -effluent May be recycled from well-designed primary lagoons, flushing water will contain fewer solids and disagreeable odors, will be less Carroaive, and the threat of d"Seame transmission sill be less when recirculated from a second-stage lagoon. Two-stage lagoons provide a number of advaritages over single ' anaerobic lagoons. However. in poultry apldlications, more than twa units in sariress is rarely benefi.ciaj. The first stage should be planned to contain the minimum design treatment vole: for an anaerobic unit, and should be maintajned at a constant depth using an overflow devise into the second stage. Design of the send-stage will depend on intandAd use. Faux ebloratives for sacnrid-atasja units are Possible: (1) source Of water for flusshinc}, (2) further treatment of wastes, (3) holding of effluent for land disposal, (4) a armbination of the above.) Exact design of second-stage units for options 1. 2, and -a. would best be based on analysis of wastewater which each unit will receive. This information will iarely be available for individual farm situations, ]hut a rule-of- thumb is ordinarily sufficient. A second-stage lagoon should be made large enough to contain an *ultry wastes to be loaded into the total system (first- and second-stages) between planned irrigation times, plus a milniaaum design volume of 54 percent of the first-stage unit. M *- water depth of second-stage lagoons should be 4 to 6 feet. This will encourage aerobic conditions, resulting in better quality f UShing vater. All pumping for irrigation and flushing should be from the second-stage lagoon. The second-stage unit may only be used foriholding overflew from the for lagoon until it can be coxiveniantly irrigated crop utilization. In such cases, the second unit should be as deep an practical and sized to Mold the total volume of all wastes and runoff which will enter the entire system, including safety margins. 0hen feasible, contents from the entire second-*stage unitimay be removed and applied to the land. Where lagoons are installed in high-water tablas areas, contents should not be lowered below the existing water table to prevent disc{turleiing the phygieal and biological seal. !. I 273 • E