ARCHIVED REPORTS_1996_1 - Laserfiche WebLink

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11. Project Description groundwater beneath the Austin Road Landfill. The existing landfill is unlined. Installation of the CAP is expected to begin July 1993 and finish by October 1993. The system will operate until the constituents of concern are no longer impacting groundwater. This could potentially take 30 years or more. The plan includes the use of three motors to run the pumps,blowers,and fans to treat the contaminated water. The installation and operation of the CAP is separate from this project. It will occur with or without the proposed landfill expansion. �4 rface Water Monitoring. The RWQCB has required monitoring samples to be collected quarterly from the Creek and analyzed. The North Branch of the South Fork of Little Johns Creek would be sampled upstream and downstream of the landfill facility;to determine whether concentrations of indicator parameters or waste constituents at these points of compliance exceed the established water quality protection standards. Surface water samples would be collected and analyzed on a quarterly basis. groundwater Trea°--MI '^.� c.,,.,�,..,mrrr r)�c har _. vstem. As a result of the CAP and the RWQCB Order No.92-143,monitoring must be performed on the pumped groundwater and on the receiving water. This includes sampling of the influent to and effluent from the groundwater treatment system and receiving water at both upstream and downstream locations. Sampling frequency varies by constituent from weekly to annually. Lr��Detection Sy is em. The recommended design includes a leak detection system of secondary collection trenches(collection lysimeters)running below the liner barrier layer parallel to the leachate collection pipe network. Collection lysimeters would drain to a low point beneath the low point of the landfill liner to a leak detection standpipe(sampling station). A portable pump would be used for sampling the leak detection standpipe. Sampling stations would be monitored monthly. The inspector would measure the quantity of any liquid present. The rate of leakage,if any,would be calculated in gallons per acre per day (gpad)by calculating the changes in liquid volume between monitoring events. The purpose of this leak detection monitoring also serves the purpose of monitoring the vadose zone to the degree that it can monitor for leakage through the liner. t '*+dfill as Monitoring. Discussions with personnel from the California Integrated Waste Management Board,the Local Enforcement Agency,and the City of Stockton have indicated that there have not been gas migration problems associated with the landfill. Combustible Gas i Indicator readings taken by personnel from the California Integrated Waste Management Board 11.33