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1 <br /> California Regional Water Quality Control Board <br /> a <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Terry Tamminen Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://ww�v.swrcb.ca.gov/rwgcb5 <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 <br /> 24 May 2004 <br /> W. Michael Carroll <br /> San Joaquin County Dept. of Public Works <br /> Solid Waste Division <br /> P.O. Box 1810 <br /> Stockton, CA 95201 <br /> REVIEW OF 1ST QUARTER 2004MONITORINGREPORT,HARNEYLANE SANITARY <br /> LANDFILL, SANJOAQUIN COUNTY,FACILITYNO. 5B390307001 <br /> We have reviewed the Harney Lane Sanitary Landfill, 1st Quarter 2004 Groundwater and Surface <br /> Water Monitoring Report(Report). Based on our review, we find the report complies with Waste <br /> Discharge Requirements Order No. 96-139, nevertheless, we have concerns regarding the increasing <br /> concentrations of chloride. <br /> MW-4 continues to have increasing concentrations of chloride with the most recent result of 150 mg/L. <br /> The County states the source of chloride is probably from the upgradient wastewater treatment and <br /> disposal facility percolation ponds owned by the California Department of Housing and Community <br /> Development, Office of Migrant Services and operated by the San Joaquin County Housing Authority. <br /> The ponds are regulated by Waste Discharge Requirements (WDR) Order No. 95-176. Because there <br /> remains a question of whether the ponds or the landfill are the source, we request the County provide <br /> verification that source in MW-4 is from the ponds and not from the landfill. The evaluation should <br /> include a list of additional constituents to test in MW-4 that would unequivocally show that the ponds <br /> are the source or the landfill is the source. <br /> Appendix I: Progress of Corrective Action Measures states that the Water Quality Protection Standard <br /> for chloride is 250 mg/L. The most limiting value is 106 mg/L as the Agricultural Water Quality Goal <br /> (Food & Ag. Org. of United Nations) for groundwater and surface water. For reference we recommend <br /> accessing the Water Quality Goals on the RWQCB's web site at http://www.swrcb.ca.gov/rwgeb5/. <br /> Therefore, a chloride concentration of 150 mg/L in MW-4 is above the water quality goal of 106 mg/L. <br /> The report states that the increases in chloride in MW-1 and MW-2 are probably due to a regional <br /> change in land use in the County, such as planting and irrigating vineyards and other crops where non- <br /> irrigated grazing land once stood. Please provide data that supports this theory. <br /> Please address comments noted in the attached Monitoring Report Compliance Checklist in subsequent <br /> reports. Include references to specific comments in the County's cover letter. <br /> California Environmental Protection Agency <br /> cls Recycled Paper <br />