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" DISTURBANCE AND RECLAMATION APRIL 1990 TO (MARCH 1991 <br /> Reclamation activity during the 1990 reporting year consisted of <br /> site cleanup, gradinq of slopes in inactive areas , reduction of a <br /> road cut and planting of areas graded during the year and <br /> previous year . Table A (page 2) summarizes acreage disturbed and <br /> reclai-fined by area during the 1990 reporting year . <br /> In the following sections of this report , each area is addressed , <br /> covering environmental activity at the site during the 1990 <br /> reporting year and planned environmental activity for the 1991 <br /> reporting year . <br /> American Tunnel Portal Area - Plate No. 1 <br /> During the 1990 report year , no additional acreage was disturbed <br /> and no acreage was reclaimed. <br /> General site cleanup was performed with metal material being <br /> hauled away by the recycler and other material being hauled to <br /> Tailings Pone? #1 for burial. <br /> Biomonitoring has been ongoing for a year now. A THE (Toxicity <br /> Reduction Evaluation) is ongoing at this time to determine the <br /> cause and/or treatability of the persistent toxicity to <br /> Ceriodaohnia dubia. The discharge is not toxic to Fathead <br /> minnows but shows a persistent low toxicity to the Ceriodaphs . <br /> Through treatment changes the level of toxicity has been reduced <br /> (from a LC50 of 30o to an LC50 of 80%) but to-date we have been <br /> unable to eliminate it or determine its cause. <br /> Activities planned for 1991 are: <br /> (1 ) To do the annual site cleanun work . <br /> (2) To continue working on the Biomonitoring toxicity problem. <br /> (3) To remove the old Lead Carbonate Tailing Pond from the site <br /> by excavating and trucking the material to Tailings Pond #1 . <br /> This project was approved by the MLRD in TR-11 and is <br /> scheduled for the fall. of 1991 . <br /> Terry Tunnel Area - Plate No. 2 <br /> During the 1990 reporting year , no additional acreage was <br /> disturbed and no acreage was reclaimed although an area that was <br /> regraded after completion of a construction project was treated <br /> with manure and seeded for test purposes . <br /> General site cleanup was accomplished along with the replacement <br /> of the flow measurement weir with an H type flume (for accuracy <br /> over a wider flow range) . Piping was installed to allow either <br /> settling pond to be taken out of service for maintenance. The <br /> settling ponds were cleaned in the fall in order to leave maximum <br /> - 1 - <br /> r W/�/6 <br />