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California Regional Water Quality onol hoard <br /> Central Valley Region <br /> Robert Schneider,Chair ;; �'G: r <br /> Terry Tamminen W4#174 r ? Arnold Schwarzenegger <br /> Secretary for Sacramento Main Office /� Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 2: 1 4 <br /> Protection 11020 Sun Center Drive#200 Rancho Cordova,CA 95670-6114 <br /> Phone(916)464-3291 <br /> 20 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 /> REVLEW OF4TH QUARTER AND ANNUAL 2003 MONITORINGREPORT, CORRAL <br /> HOLLOWSANITARYLANDFLLL, SANJOAQUINCOUNTY, WDID5B390307001 <br /> We have reviewed the Corral Hollow Sanitary Landfill, 4th Quarter 2003 Groundwater and Surface <br /> Water Monitoring Report(Report). Based on our review,we find the report complies with Waste <br /> Discharger Requirements Order No. 5-01-176. <br /> Data show that there are increasing concentrations of inorganic constituents in monitoring wells, as well <br /> as increasing VOCs in MW-5 (impacted well). The current remediation system includes a landfill gas <br /> collection and flare system. This system does not remediate inorganic constituents in groundwater. <br /> MW-5 shows increasing levels of TDS, sulfate, chloride,bicarbonate alkalinity as CaCO3. Data from <br /> MW-4 has been evaluated due to nitrate increases, but was inconclusive. It appears that leachate is <br /> being released to groundwater at MW-5 and possibly MW-4. MW-6 and MW-7, the new deep wells, are <br /> also detecting hexavalent chromium above water quality objectives. The County of San Joaquin is <br /> required to address these impacts in accordance with Title 27 CCR Section 20430 by submitting an <br /> Engineering Feasibility Study for Corrective Action. In this regard,please include a map with all wells <br /> within one mile radius of the facility. Updated cross-sections should also be included. <br /> As requested in the Regional Board's letter of 3 February 2004, the format of Table 1 (see Report), <br /> should be changed to reflect the latest concentration limit for each constituent of concern(COC). As an <br /> example, the statistical evaluation shows that nitrate is statistically increasing so a new limit is not <br /> recalculated and the result in Table 1 is a NE [2]. When this occurs, Table 1 should reflect the latest <br /> calculated concentration limit for comparison. Please submit a new table showing these changes by <br /> 1 June 2004. <br /> Please address comments noted in the attached Monitoring Report Compliance Checklist. <br /> California Environmental Protection Agency <br /> Qa Recycled Paper <br />