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c. MW3A (Groundwater quality of the shallow zone immediately south and upgradient of the ponds): Monitor progress toward achieving the WQPS near the salt source area(i.e., former ponds); d. MW4A(Groundwater quality of the shallow zone southwest and upgradient of the ponds and near the Creek): Monitor the effectiveness of facility drainage improvements and significantly reduced salt levels in stormwater discharged to the Creek on the restoration of shallow groundwater quality to the WQPS; e. Well A(Groundwater quality of the shallow zone southeast and upgradient of the ponds): Monitor progress toward water quality improvements just beyond the southeasterly extent of the capture zone; and f. EW 1 (Groundwater quality of the shallow zone north and downgradient of the ponds): Monitor progress toward achieving the WQPS downgradient of the salt source area(i.e., former ponds). Sampling of the corrective action wells will occur semi-annually in coordination with the existing evaluation monitoring program; samples will also be analyzed for the same constituents. Additional analyses are also proposed for well EWl,particularly analyses for 1,2-dibromocloropropane(DBCP) due to previous detections of this compound in Well C which has since been discontinued for use as a site water supply well. DBCP has not been used at the facility,but nearby agricultural land uses appear to have contributed to the occurrence of low levels of this constituent in local groundwater. 6.2 Groundwater Levels Groundwater surface elevations (in feet and hundredths, MSL)in all evaluation monitoring wells are measured on a quarterly basis and used to determine the velocity and direction of groundwater flow and also vertical gradients. In accordance with the WDRs, the data are used to construct groundwater contour maps for the shallow and deep groundwater zones for inclusion in the semi-annual and annual monitoring reports. Groundwater levels will continue to be monitored during corrective action on the same schedule as required in the WDRs. Pumping water levels will also be monitored in well EW 1. Additionally, supplemental water level data are planned to be collected at the start-up of the extraction program from transducers and data loggers installed in up to six of the dedicated monitoring wells. These data will supplement other water level data and will be used to preliminarily assess the effective area of capture achieved with the new extraction well (EWl). © LUHDORFF & SCALMANINI CONSULTING ENGINEERS 13