1999-08-23_HYDROLOGY - M1999051 - Laserfiche WebLink

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I • Surface and Ground Water Monitoring Plan • I I I 1 I I I I I I I I I I I I 1 I AmerAlia, Inc. — Experimental Pilot Plant - Nahcolite Project 99 -043P 09306230. This monitoring station will monitor Stake Springs Draw upstream of the proposed Project facilities, and upstream of the irrigation ditch. SW -3: This station is located on the Yellow Creek drainage downstream of the proposed Project facilities and upstream of any potential effects of other nearby sodium production sites located east of the Rock School Lease Tract. This station will monitor Yellow Creek downstream of the Project area. The proposed location for this station is the SE %4, Section 16 on Yellow Creek. The surface water monitoring program will also include the results of monitoring on the two active USGS Monitoring Stations Nos. 09306242 (Corral Gulch Station) and 09306255 (Yellow Creek), as available. 2.2 Spring and Seep Monitoring A spring and seep survey will be completed below the project site between the proposed upstream (SW -1) and downstream (SW -3) surface monitoring sites. This survey will be completed in August 1999. The results of the survey will be used to identify spring and seep monitoring stations. Springs will be sites with measurable flow of greater than or equal to one gallon per minute (gpm). Sites with diffuse and immeasurable flows or standing water will be designated as seeps. At this time there is only one known spring (S -1) within the project area. Springs identified during the survey will be added to the surface water monitoring program. 3.0 GROUND WATER COMPLIANCE MONITORING The ground water monitoring program will include a series of wells designed to monitor the shallow alluvial aquifer and the two (potentially three) bedrock aquifers designated as: the Upper Aquifer, Lower Aquifer, and the Top of the Dissolution Zone. The first two aquifers comprise the known underground sources of drinking water with total dissolved solids (TDS) concentrations less than 10,000 mg /l. The need for monitoring the Top of the Dissolution Zone will be decided after the installation of the proposed process monitoring well DSW -1. If this well, installed between the first three production wells, would indicate TDS of ground water at the Top of the Dissolution Zone higher than 10,000 mg /l, no additional monitoring well will be installed. If the water quality in well DSW -1 would have TDS less than 10,000 mg /1, one additional monitoring well will be installed. This well, screened at the Top of the Dissolution Zone, will be located downgradient of the production wells near the other bedrock aquifer monitoring wells. The wells will be drilled and constructed to comply with Colorado State rules and regulations. Monitoring will include water level measurements, field water quality measurements (pH, temperature, and electrical conductivity), and laboratory water sample collection and analysis. Locations of the proposed monitoring wells are shown on Figure 1. Monitoring well construction drawings are presented on Figures 2, 3, and 4. The Monitoring Plan is summarized in Table 1. Recommended parameters for laboratory analysis are listed in Tables 2, and 3. \ \GametViome _new \Vladimi, AmerAliMAmerAlia Report R3.doc- 20- Aug -99 -2-