1997-04-24_REVISION - M1977493 (12)

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• Page 8 3.0 RESERVOIR BOTTOM MATERIAL INVESTIGATION SAP The reservoir bottom material investigation SAP defines objectives and tasks for achieving a representative sampling event based on sound statistical principles and provides guidance for all field work by defining the sampling and data gathering methods to be used. 3.1 Reservoir Bottom Material Investigation Task Objective The reservoir bottom material investigation consists of sampling material from the bottom of Eagle Park Reservoir to demonstrate tailings removal. The investigation will also evaluate the impact on the soils (if any)by the previously overlying tailings. 3.2 Sample Locations and Frequency Figure 1 presents a sampling grid which was developed to provide representative sampling of the materials on the reservoir bottom. A similar grid will be made on the reservoir bottom prior to • sampling. Thirty samples of the bottom material will be collected; one sample from within each grid area. The grids are an average of two acres in area and cover the entire reservoir. Sample locations will be marked for surveying and photographs will be taken of the reservoir and each sampling location. Locations will be identified with cards indicating sample designations. Sample designations and locations will also be indicated on a map during the sampling event. Sampling of the reservoir bottom will occur once in October or November 1996 after completion of tailings removal from the reservoir. The 30 samples will be collected and half the samples will be sent to the laboratory for analysis along with QA/QC samples, as shown in Table 1. The 15 samples to be sent to the laboratory for analysis will be determined using a checker board pattern where a sample from every other grid area will be analyzed. The remaining samples will be archived and no further analysis will be required. If results indicate detection above acceptable limits for the analytes sampled, then additional definition is required and part or all of the remaining 15 samples will be analyzed. 3.3 Sample Designation Eagle Park Reservoir bottom material samples will be designated as follows: Sample ST01 will be collected from the northwestern-most grid area and numbering will proceed from ST01 • through ST30, from north to south completing each row, then proceeding by rows from west to east. CO2075 PRIVILEGED AND CONFIDENTIAL — - - - —-- Environmental. C.\PROTECTS\6102.0OIVtl 176102.001[6R0/96] �