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• • APPENDIX 6-4 STIPULATION NO. 5 I.0 Introduction A total of IS core hole analyses have been completed for the Seneca II permit area. Following the submission of the Seneca II Permit Application in December 1980, six cores remained to be analyzed and four cores remained to be sampled and analyzed (Volume II, Tab 6, pages 14 and 15). Peabody stated that the results would be submitted when the laboratory analyses were complete. Included in the 1981 analyses are the additional I I parameters requested by CMLR listed in Volume II, Tab 6, page I IA of the Seneca II Permit Applica- tion. The following discussion summarizes the chemical and physical results of the ten 1981 core analyses. The data is also compared to the summarized core data previously submitted to CMLR in December 1980. Lastly, unsuit- able zones are discussed, mitigative measures are stated, and the reclama- tion potential is evaluated. 2.0 Sampling and Analysis All overburden core hole locations are shown on Exhibit 6-I of the permit application. Survey information for the four core holes drilled in 1981 is given in Appendix 6-4, Table I. The placement of core holes was predeter- mined by CMLR personnel (Mr. Roy Cox) and Peabody hydrologist (Mr. Robert Smith). The hole locations effectively cover the entire permit area. The density of core holes is one hole per 125 acres. Fifteen of the core holes have corresponding ground water wells to allow physiochemical comparisons to be made between overburden/underburden and ground water quality. The sampling techniques used to collect the ten 1980 and 1981 cores were identical to those described in the Seneca Permit Application (Volume II, Tab 6, pages 6-14 and 6-15). Additional laboratory analyses were determined on the ten 1980 and 1981 cores to meet the requirements of CMLR. The analyses methods used by 6-137 Nov 2 s ~se~