In a nutshell, acid mine drainage is a form of water pollution that happens when rain, runoff, or streams come in contact with rock that is rich in sulfur. As a result, the water becomes very acidic and damages downstream aquatic ecosystems. In some regions it is the most common form of stream and river pollution.
Probate in Washington typically takes six months to a year, depending on some choices the executor makes (discussed below). It can take much longer there is a court fight over the will (which is rare) or unusual assets or debts that complicate matters. Unless there is a dispute, it's mainly a matter of filing paperwork.
That is, the taxpayer had to file a claim for refund/credit within four years from April 15, the original due date of the return. For 1995 and later tax years, if the taxpayer filed a return on or before April 15, a claim for refund/credit must be filed within 4 years from April 15.