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2013-04-18_PERMIT FILE - C2009087A
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2013-04-18_PERMIT FILE - C2009087A
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Last modified
11/30/2016 9:55:16 AM
Creation date
5/1/2013 12:34:12 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C2009087A
IBM Index Class Name
Permit File
Doc Date
4/18/2013
Doc Name
Hydrology Description
Section_Exhibit Name
2.04.7 Hydrology Description
Media Type
D
Archive
Yes
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RULE 2 - PERMITS <br />Alternative Water Supply Information Additional details relative to the potential for <br />contamination. diminution. Or interruption of water Supplies is presented in Section 2.05.6(3). <br />Protection of Ilvdrologic Balance. <br />Groundirater Monitoring A ground��ater monitoring pro`,rann «ill be implemented to monitor the <br />OroUndwater to determine: I) the effects of ininlllg activities on the quantity and quality of x\ater 111 the <br />gl'olllldwater systems in the permit area and adjacent area: and 2) compliance Rlth applicable <br />ground%\ater standards at established points Of conipliaince. The proposed monitoring program coven's <br />gl'Orllldwater in the overburden, Wadge Coal. allllv1u111. and the Seneca reclaimed spoils aquifer. All <br />nionitorino and sampling will be conducted in accordance «Ith CDRMS guidance regarding sampling ZLI <br />methods. measurement of parameters 111 the field and laboratory. and required analytical parameters <br />including SectioIl 4.05.13 and applicable Subsections. Lvalllations Of trends in parameter <br />concentrations over time and comparison of those concentrations to groundwater protection standards <br />will be made. Existing data establishes the baseline for the aquifers. which include transient impacts <br />from previous activities in the watershed. A discussion of the potential hydrologic consequences of the <br />proposed PSCM relative to baseline conditions is presented in Section 2.0 .6(3). <br />Table 2.04.7 -T9 lists the wells to be included in the monitoring program monitoring frequencies and <br />the parameter- list used. Tables 2.04.7410 and T10.1 lists the water quality parameters to be <br />measured in the field and those to be measured or analyzed in the laboratory. Details regarding the <br />construction Of the wells and the results of monitoring to date are provided in Exhibit 2.04.7 -E1. <br />l lydrolooic Information. Groundwater monitoring data will be submitted to CDRMS in annual reports <br />by March 31" of each year. <br />The proposed point of compliance (POC) is well SGAL70, completed in the Grassy Creek alluvium <br />approximate]\- 1000 feet downstream of the permit boundary. This well has been monitored for water <br />levels and water quality since 1988 and provides a long period of historical record against which to <br />compare newly- acquired data. This well was approved by the CDRMS as a POC well for the Seneca <br />II mine in March 2009 under TR -47. In TR -47, bedrock POC wells were not deemed necessary due to <br />low hydraulic conductivities and well yields, and because attenuation and dilution should assist in <br />limiting water quality impacts on bedrock units from mining activities to close downgradient <br />proximities. Since the same bedrock units that were determined in TR -47 by CDRMS to not require <br />POC's will be affected by mining activites at the PSCM. PSCM does not propose to establish POC "s <br />for these units. <br />There are four monitoring wells used for determing hydrologic impacts from the Seneca I1 Mine that <br />are proposed for including in the PSCM monitoring program. These wells are SOV42 (Wadge <br />Overburden), SSP61 (Little Grassy Creek Spoils), SSP62 (NPDES4 Basin Spoils), and SCAL69 <br />(NPDES4 Basin Alluvium). These wells are included in the following Table 2.04.7 -T9, and details <br />regarding the construction of the wells are provided in Exhibit 2.04.7 -E1. <br />Midterm Review 2.04 -103 Revision 04/2013 <br />
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