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3 EVALUATION MONITORING PROGRAM The proposed evaluation monitoring program for the Harney Lane Sanitary Landfill was prepared consistent with the requirements of Section 2550.9 of Article 5 and includes • A new groundwater monitoring program to evaluate changes in water quality resulting from a release from the landfill • An assessment of the nature and extent of a release at the landfill • Preparation of a feasibility study describing the corrective action measures that could be taken at the landfill • Submission of an amended report of waste discharge (ROWD) containing an evaluation of changes in water quality, assessment of the nature and extent of release, and the feasibility study 3.1 Groundwater Monitoring Program 3.1.1 Current Monitoring Program Groundwater and surface water are currently monitored at the landfill. The monitoring locations, as shown on Figure 2, include monitoring points currently specified in the site's WDR Order No. 93-093. Groundwater migrates through interconnected pore space in sand and gravelly sand. The aquifer is located at approximately 80 to 100 feet below ground surface, and depth to first-encountered groundwater is presently approximately 120 feet below ground surface. Monitoring wells have been installed at the site to monitor groundwater quality. One background well(MW-1)and three downgradient wells (MW-2 through MW-4)constitute the current monitoring well network. Upgradient well MW-1 is intended to represent groundwater quality that has not been affected by landfill activities. Well MW-2, MW-3, and MW-4 are intended to detect possible groundwater impacts from the landfill. Groundwater levels are measured and groundwater samples are collected from these wells on a quarterly basis consistent with the WDR Order No. 93-093. SAC/pjM93M390011.8a1-94/1fc:9 Rev.0, 10/17/94 0939-001.18 5