HYDRO28252

• Permit No: M1999002
• IBM Index Class Name: Hydrology
• Doc Date: 12/23/1999
• Doc Name: GROUNDWATER SURFACE WATER & PROCESS MONITORING PLAN
• From: AMERICAN SODA LLP
• To: DMG
• Media Type: D
• Archive: No

' Uccenrber ZJ, 1)99
2.0 GROUNUWATCR MONITORING

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This groundwater monitoring plan presents detailed descriptions of the monitoring well
layout, well completions, groundwater monitoring zones, water-quality parameters, monitoring
schedules, and monitoring procedures. The Piceance Site has 25 monitoring well completions
located in 18 boreholes. The Parachute Site will have al least one monitoring well. The
groundwater monitoring procedures arc described in Section 3.0. Two domestic wells near the
Piceance Site arc also included in the program.
2.1 Groundwater Monitoring Locations
2.1.1 Prcennce Sife Grouufivnter MnJJiloring Locations
The monitoring well layout for the Piceance Sile is shown on Figure 1. Figure 2 is a
generalized stratigraphic column showing aquifer locations and important stratigraphic horizons
for the Piceance Site. Monitoring well completion diagrams are presented in Appendix A. A
summary of the Piceance Site monitoring wells included in the groundwater monitoring plan is
presented in Table I.
The monitoring wells are positioned up-gradient, down-gradient, and cross-gradient of the
0-5 year mining panel. The monitoring well layout assumes a groundwater Flow direction in both
the Upper Aquifer and Lower Aquifer of southwest to northeast. This trend is in accordance with
regional groundwater data (Weeks et al. 1974). Site-specific data I}om the Upper Aquifer
suggests the flow direction is roughly west to east. Therefore, positions of the up-gradient and
down-gradient wells, relative to groundwater flow direction, are based on an averaged flow
direction of N65°E. American Soda has installed [his well configuration for the 0-5 year mining
panel to assure that potential impacts to groundwater and surface water will be detected.
American Soda will use a network of 25 monitoring well completions (as detailed in
Figure I) to monitor groundwater quality and water levels at the Piceance Site for the 0-5 year
mining panel. The Upper Aquifer will be monitored at I 1 locations, the Lower Aquifer will be
monitored at 10 locations, and the Alluvial Aquifer will be monitored at 4 locations. Of [he
25 well completions, IS completions (10 well bores) are located outside the 0-5 year mining
panel, and 10 completions (R well bores) are located within the 0-5 year mining panel.
'Weeks, J. 13., G. H. Leavesley, P. A. Welder, and G. J. Smtlnier, Jr. (1974)., "Simulated GtJecls otOil-Shale
Development on the Hydrology of l'icemice lJasin, Colorado," L/.SGR Pry fc.c.ciuiud Puper 90.1', 84 p.
Agapito Associates, Inc.