Compaction/Liner Requirements Table 1- Missouri's storage design and construction specifications Facility Type Liner Materials Allowed Liner Permeability Additional Requirements CAFO w/ wet handling system Soil, asphalt, soil cement, synthetic liner; bentonite, soda ash or other sealers may be used w/ soil liners 500 gal/ac/day if risk of potable water contamination; 3500 gal/ac/day otherwise Class IA CAFOs (>= 7000 AU) must: have engineer inspect and certify lagoon seal and compaction barrel test lagoon for leakage must notify MDNR at least 7 days prior to compaction and barrel test dates to allow observation of tests Table 2- Missouri's allowable seepage rates Condition Allowable Seepage Rate Potable water contamination risk 0.0184 in/day or 500 gal/ac/day No potable water contamination risk 0.1286 in/day or 3500 gal/ac/day Missouri requires certification and inspection of the lagoon seal by a professional engineer. Additionally, after a lagoon liner has been inspected and certified by a professional engineer as being properly constructed, Missouri still requires a barrel test to monitor the seepage rate of the clay liner. Proper construction of lagoon liners is necessary to maintain water quality protection. To ensure proper construction specifications are achieved, a professional engineer or other qualified individual should monitor the process of constructing the liner and certify the completed structure. In instances where acceptable compaction requirements cannot be achieved with earthen liners, the use of synthetic products should be considered to aid in achieving the desired seepage control for the structure. Return to Step 3  |   Return to Overview