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egional Water Quality Cowdrol Board Central Valley Region Karl E.Longley,ScD,P.E.,Chair Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Arnold Secretaryfor Phone(916)464-3291 •FAX(916)4644645 Schwarzenegger Environmental http://www.waterboards.ca.gov/centralvalley Governor Protection 19 August 2009 W. Michael Carroll San Joaquin County Department of Public Works Solid Waste Division P.O. Box 1810 Stockton, CA 95201 REVIEW OF EVALUATION MONITORING PLAN ALTERNATIVE, HARNEY LANE LANDFILL, SAN JOAQUIN COUNTY The Central Valley Regional Water'Quality Control Board (Central Valley Water Board) staff has reviewed the Evaluation Monitoring Plan (EMP) Alternative prepared by San Joaquin County Public Works (Discharger) for the Harney Lane Landfill. The EMP was prepared in response to the 11 May 2009 letter from staff requiring the Discharger initiate evaluation monitoring in response to a "measurably significant' release confirmed at well MW-4. Actions taken by the Discharger in response to the 11 May 2009 letter included collection of groundwater samples from multiple domestic supply wells surrounding the Harney Lane Landfill, and the proposal to install four additional landfill gas (LFG) extraction wells to enhance the gas systems capture of LFG in the vicinity of wells MW-2 and MW-4. Chemical analyses of the domestic supply wells sampled indicates that volatile organic compounds (VOCs) do not appear to be affecting groundwater collected from these supply wells at this time. To complete the supply well study, the Discharger has agreed to collect an additional groundwater sample from the Migrant Labor Housing facility at the request of staff. Furthermore, in lieu of performing an off-site investigation to delineate the nature and extent of the VOCs detected in wells MW-2 and MW-4, staff concurs with the proposal to increase corrective action in the vicinity of these wells at this time. The VOCs detected in groundwater are likely a result of LFG partitioning into groundwater and staff agrees that enhancing the corrective action would be the most beneficial and cost effective method to control LFG and the VOCs detected. The Discharger has presented a tentative schedule, which they will provide a status update by November 2009. Staff requests the Discharger present in tabular form the domestic supply well data for all the wells sampled, including the Migrant Labor Housing facility. Also, staff requests the Discharger perform a search of wells at the Department of Water Resources for the boring logs of the domestic wells sampled so that a correlation between these wells and on-site monitoring wells can be made. Groundwater collected from the domestic wells is likely from lower water bearing zones and if so, not comparable to affected groundwater of the upper water bearing zone monitored at the Harney Lane Landfill. By 12 November 2009, the California Environmental Protection Agency 01 Recycled Paper