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Revised; August 27, I9b7 <br />4.05.8 Acid Forming Spoil <br />La Plata ¥1 has observed acid drainage that appears to be caused <br />by surface water moving over recently turned material that probably <br />contains acid forming material. <br />To treat this condition; La Plata T1 has cunstrucled a series <br />of two ponds where manual treatment of the acidic waters will take <br />place. See '1.0f7(o)for location and extent of the ponds. <br />Treatment Plan <br />1.)Finely ground limestone will be the buffer used. This limestone <br />will act slower but longer than normal lime. The ,ground limestone's <br />slower - longer action will he more beneficial since the acid <br />forming drainage is only seasonal and occurs only during the wet <br />season. <br />4.) First pond treated ~~ith limestone. ^lajur urecipitation <br />occurs. When fill .level is reached, water flows into the <br />second pond for secondary precipitation. Possible additional <br />treatment may take place here as required. <br />2.) Outfall. There is rarely any outfall from the second pond as <br />it contains only seasonal flow. Most of the water evaporates <br />within the structure. Iluwever, if dischar;,e ever occurs, it is <br />routed into the main sediment pond for additional settling. <br />4.0 ,.7(A) <br />