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-25- <br />Degradation of the ground water quality by the Twin Pines No. 2 Mine will be <br />minimal. Probable hydrologic consequences were projected by evaluating the <br />existing water quality in a nearby abandoned mine, the sandstone aquifer below <br />the coal seam and the roof and floor rock of the proposed mine. The water <br />quality of the Caldirola well, the monitoring data from TP-W1, and the <br />analyses of the roof and floor rock of the proposed Twin Pines No. 2 Mine were <br />compared by J.F. Sato and Associates (see pages JFS A-28 through L-45 of the <br />permit application). The water quality parameters which exceeded the EPA <br />domestic water standards (EPA, 1970) and those which appear relatively high <br />for water quality in the state are shown in the following table: <br />Table 1. <br /> <br /> <br />Parameters <br />m /1) Parameters <br /> <br /> <br />EPA <br />Standard exceeding EPA <br /> <br />Caldirola <br />Well <br />423-69 domestic water standards. <br />A <br /> <br />TP-Wl Roof Fl r <br />-30-83 5-2 -83 water extrac ~ la) <br />Ammonia 0.02 0.6 1.3 0.9 <br />Barium 1 2.4 2.8 0.001 O.OOI <br />Cadmium 0.005 0.007 0.0058 0.0058 <br />Chromium 0.05 0.00 0.19 0.16 0.01 U.O1 <br />Copper 0 0.10 0.40 6.0 2.9 <br />Iron 0.3 0.25 59 200 95 40 <br />Lead 0.05 0.00 0.17 0.42 28 11 <br />Manganese 0.05 0.00 1.5 6.4 3.0 5.2 <br />Nickel 0.14 0.29 1.0 0.98 <br />TDS 500 1019 760 790 800 1100 <br />Zinc 0 0.40 2.1 23.0 5.6 <br />Based on this comparative analysis, mining operations proposed by Twin <br />Pines Coal Company, Inc., are not expected to significantly effect <br />overall water quality. However, total dissolved solids are expected <br />increase. <br />Degradation of ground water quality can be estimated by comparing the <br />area of potential impact to the total area of the synclinal basin. The <br />two mines which might impact the quality of ground water are the Twin <br />Pines No. 2 Mine and the Dorchester No. 1 Mine. Background information <br />on the probable hydrologic consequences of the Dorchester No. 1 Mine can <br />be found in section 2.05.6(3) of Dorchester's Second Adequacy Response. <br />Three assumptions were made: <br />i) The Twin Pines No. 2 idine occupies 120 acres, or about .19 <br />square miles and the Dorchester No. 1 t4ine permit area occupies 979 <br />acres, or about 1.5 square miles. The perimeter of the synclinal <br />basin encompasses about 47 square miles. Thus, the Twin Pines' <br />permit area occupies about .4~ of the synclinal basin and <br />Dorchester 3%. <br />