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0 <br />Californi egional Water Quality Co of Board <br />Qa; Central Valley Region <br />Karl E. Longley, ScD, P.E., Chair <br />Linda S. Adams Arnold <br />Secreta rYf or Sacramento Main Office Environmental 11020 Sun Center Drive #200, Rancho Cordova, California 956706114 Schwarzenegger <br />Protection <br />Phone (916) 464-3291 • FAX (916) 464-4645 Governor <br />http://www.waterboards.ca.gov/centralval ley <br />4 January 2008 In L C-�9 <br />Andrew Keller 0I'1 0 8 2008 <br />Sims Hugo Neu ENVIft, �i' IMIENT HEALTH <br />901 New Dock Street PERMIT/SERVICES <br />Terminal Island, CA 90731 <br />THIRD QUARTER 2007 GROUNDWATER AND LANDFILL GAS MONITOIRNG EVENT, <br />COVE CONTRACTORS LANDFILL, SAN JOAQUIN <br />Regional Water Quality Control Board (Regional Water Board) staff has reviewed the "Third <br />Quarter 2007 Groundwater and Landfill Gas Monitoring Event' (Report) received on <br />30 October 2007 for Cove Contractors Landfill (Discharger). The Report contained laboratory <br />analytical data, tables, groundwater elevations, figures showing current monitoring point <br />locations and groundwater gradients, standard observations, and a discussion of field and <br />laboratory results. The Regional Water Board regulates the Discharger under Waste <br />Discharge Requirements Order No. R5-2007-0084 and Cleanup and Abatement Order No. <br />R5-2006-0707. <br />Based on staffs review, the report is well organized with sampling results clearly presented <br />and the report evaluation well written. Nevertheless, staff finds the Report incomplete. Staff <br />notes that the historic monitoring well locations were not included on the maps. In addition, for <br />the first time ethanol was reported in the groundwater analysis. Six monitoring wells had <br />concentrations that ranged from 110 to 220 ug/L. The Discharger stated that the reported <br />ethanol concentrations were due to lab contamination. While staff understands the potential <br />for cross -contamination, the trip and method blank analytical reports were "non -detect" for <br />ethanol. After further review of the laboratory's QA/QC reports, staff is unable to determine if <br />the laboratory was the source of ethanol contamination in groundwater samples <br />In order for the Report to be reconsidered complete, the Discharger shall submit the <br />information listed below by 11 February 2008: <br />1. The Discharger shall submit revised Figures 2 and 3 showing all the historic and current <br />monitoring locations. The Discharger shall include both groundwater and landfill gas <br />monitoring point locations. <br />2. The Discharger shall submit proof that laboratory contamination was the source of <br />ethanol in the groundwater analytical reports. Further, if laboratory contamination <br />persists, the Regional Water Board may require the Discharger to obtain and analyze <br />split samples. In addition, in order to mitigate cross -contamination from portable <br />generators during sampling, the Discharger may propose the use of passive sampling <br />techniques for this site, such as the HydrasleeveTM or similar technologies. <br />California Environmental Protection Agency <br />0Recycled Paper <br />