2007-07-30_GENERAL DOCUMENTS - C1981041

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CRDA Piezometers ~~~'~ i' CRDA-Ol through 03, and OIA; and thirty piezometers (P~~i 100-107, 200-206, 300-307, and 400-406), all on CRDA-l, monitored quarterly for rater level. "Critical levels" defined for 100, 200, 300, and 400 series piezometers. ~ i~'. CRDA-04 through 06 installed onCRDA-Z, monitored quarterly for water level. ~. Unit Train Loadout Piezometers ~' Quarterly water level monitoring UTL-01,02,03,04; Annual water quality monitoring UTL-02 and UTL-04 (pariuneters listed in Permit Table 18-3)' ~' I ,, Roadside South Portal Workines r I Well N-1, located at reclaimed North Decline; quarterly weiiter level monitoring. i i, Rollins Sandstone Wells ~ Rollins-2 (At UTL) Rollins-3 (Near Pond 7, North Decline) Quarterly water levels and Annual water quality analyses (Table 18-3) required for Rollins Wells Monitoring of in-mine wells (Rollins-1 and Rollins-4) has been discontinued because the portals have been sealed and the wells are therefore no longer accessible. The Roadside Mines are required to submit to the Division +m Annual Hydrologic Report that provides information on the water quantity and quality for both the surface and groundwaters in the permitted azea. [n addition, quarterly NPDES reports are submitted to the Division and the Department of Health to comply with the current laws governing point sources. In the event of an effluent discharge that is not within compliance parameters, a writteh notice will be forwarded to the Division and the Department of Health. Groundwater monitoring wells are located in both the Rapid, Creek and Cottonwood Creek basins. G W MS 02a and 02b are upstream on Cottonwood Creek, G WMS 03a and 03b are upstream on Rapid Creek, while GWMS Ola and Olb are downstream on Rapid Creek (downstream from the confluence with Cottonwood Creek). l"fhese wells have been placed to monitor surface subsidence impacts on creek flows in the southern permit area; therefore, water level is the only pazameter measured. CRDA-1 and CRDA-2 piezometers are monitored for water levels on a quarterly basis (thirty-four on CRDA-1 and three on CRDA-2). The thirty, 100 through 400 series piezometers on CRDA-I were installed in 1994 at four locations to monitor water levels in multiple zones within the refuse pile. Stability analyses performed by a consultant to the operator established "critical levels" for each of the thirty,pia; zometers, which if exceeded, are to'be reported by the operator, and may necessitate further stability evaluation and possible remedial measures. Critical level for each piezomeer is listed in permit Table 18- 4. I Permit Revision No. 3 ~ Perini[ No. C-1981-041 July 30, 2007 ~ Page 26