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Section 3 s ENVIRONMENTAL MONITORING I r 3.0 INTRODUCTION j The purpose of the environmental monitoring program for the Austin Road Landfill Facility, Class III Landfill, is to provide data that will indicate the landfill's compliance status with regard to regulatory agency requirements and other specific conditions of permits. Environmental monitoring for the expanded landfill will involve monitoring of groundwater, surface water, leak detection and landfill gas, and hazardous waste screening. Environmental monitoring for the existing landfill is currently described in "Monitoring and ' Reporting Program No. 90-122"and Monitoring and Reporting Program No. 92-143",both issued by the California Regional Water Quality Control Board, Central Valley Region and the Solid Waste Facility Permit, 39-AA-001, issued by the San Joaquin Local Health District (copies included in Appendix F). These programs set forth the parameters for nonhazardous solid waste monitoring, sludge monitoring, groundwater monitoring, and surface water monitoring, and a monitoring program, respectively. Since sludge is not being accepted at the landfill, there is currently no monitoring being done on it. The environmental monitoring requirements described herein are taken from existing permit requirements for groundwater, surface water, nonhazardous solid waste, and operations. The monitoring and reporting requirements for the expanded landfill must meet the requirements of RCRA Subtitle D, which may require a modified monitoring program than is set forth below. i 3.1 GROUNDWATER MONITORING The landfill has had a groundwater monitoring program since December 16, 1977, when the RWOCB adopted Order No. 77-288. There are thirteen monitoring wells, MW1 through MW13, two extraction wells (EW1 and EW2),and two water supply wells,Water Supply Well (WSW)and West Water Supply Well (WWSW) at the landfill. Ten of the monitoring wells are downgradient of the landfill (MW1, MW4, MW6, MW7, MW8, MW9, MW10, 11, MW12, and MW13) and a three are located upgradient(MW2, MW3, and MW5). The Landfill is currently under a Corrective Action Plan for groundwater contamination (volatile organic compounds). Development of the Corrective Action Plan included installation of six additional monitoring wells, thereby increasing the number of groundwater monitoring wells to thirteen (numbers MW-1 through MW-13). The water supply well, WSW, has also been decommissioned in compliance with Waste Discharge Requirements Order Number 90-122. This monitoring will be a continuing i activity which will provide a key focus toward future groundwater monitoring activities. 10 Groundwater monitoring for the Austin Road Landfill Facility Expansion is required by and will be in accordance with Section 255(b) of California Code of Regulations, Title 23, Division 3, Chapter 15. The monitoring network will consist of background monitoring wells and down- City of Stockton R.W.Beck and Associat9s 1811.002