R2008-13 AUTHORIZING EXECUTION OF AGREEMENT

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i define the assumed groundwater concentration at the downstream limits of the zone of soil contamination. This assumed ►eached groundwater concentration is then inse�ted in the Domenico equation (R26) in order to estimate the distance at which the groundwater concentration meets the groundwater remediation objective. For groundwater contamination, the concentrations are inserted directly in equation R26. The hydrau�ic conductivity was determined from a slug test in monitoring well MW-1A to be 3.52E-4 cm/s using the Bouwer-Rice analysis method. The hydraulic gradient used in the calculations was 0.0196, which was obtained from water level measurements collected at the site in July 2007. The distance parameters for the soil samples from B-2, B-3, B-14, B- 18, Sample #1, Sample #2, Sample #7, Sample #8 and for the groundwater samples from MW-9, MW-14, and MW-18 are given in Table 3. Table 3: Dimensional Information for Tier 2 Analysis Point Compliance Pt. Dist. To Compl. Plume Width Plume Width Pt. (X) Perpendic. Flow Parallel to Flow L� � Soil sample B-2, Limit of 125 ft 80 ft 220 ft 5 ft Contamination Soil sample B-3, Limit of 175 ft 80 ft 220 ft 5 ft Contamination Soil sample Limit of 75 ft 80 ft 220 ft B-14, 5 ft Contamination Soil sample Limit of 130 ft 80 ft 220 ft 8-18, 7.5 ft Contamination Soil Sample#1, Limit of 231 ft 80 ft 220 ft 10 ft Contamination Soil Sample #2, Limit of 290 ft 80 ft 220 ft 6 ft Contamination Soil Sample #7, Limit of 85 ft 80 ft 220 ft 7.5 ft Contamination Soil Sample#8, Limit of 150 ft 80 ft 220 ft 6 ft Contamination GW sample Limit of 220 ft 120 ft -- MW-9 Contamination GW sample Limit of 30 ft 120 ft -- MW-14 Contamination GW sample Limit of 165 ft 120 ft -- MW-18 Contamination The calculation sheets are provided in Exhibit xx.