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Monitoring Report Compliance Oklist Discharges Regulated by Title 27 and/or Part 258 RWQCB Reference Parameter Yes No N/A Reviewer Comment WDRs/MRP/ Groundwater Monitoring Standard Provisions 1. Are all groundwater Field Parameters X (Sept 93/Aug 97) Monitoring Parameter, and CDCs (if required) sampled and analyzed? in. Have any groundwater concentration X Chloromethane and methylene limits been exceeded? If yes, identify chloride were detected in well G- in comments. 5• n. Is there a description and graphical X Groundwater contours are presentation of groundwater flow' erroneous if the elevations on direction and gradient? Table 1 are correct. o. Monitoring Wells: Is there a X Need to record the time after description,method,and time purging of water level measurement and well recovery time? p. Purging: Is there a description X of the purging method,purge pump and its placement, and field parameters? Additional Comments and Recommendations: VOCs were not detected except in G-5. Methylene chloride(0.0711) µg/1) and chloromethane (0.238) µg/1) were detected in G-5. The county did not resample because they consider methylene chloride to be a common"laboratory contaminant",however the methylene chloride was not detected in the laboratory QA/QC reports. Well G-5 should be resampled for VOCs. Time series plots indicate that nitrogen as nitrate should be carefully evaluated. A well completion diagram with field boring log has not been provided for the new well. We requested submittal of this data by 15 January 2001 in our 19 December 2000 letter. The groundwater contours shown in Figure 3 are erroneous. Map must be redrawn and resubmitted, text discussion of groundwater flow (page 8) should be resubmitted as necessary. Units of concentration for the 5-year constituents listed on Table 2 are not indicated. Hexavalent chromium was detected in leachate sample L-1 at 0.00185)mg/l, but the laboratory control spike sample (LCS) also detected 104% (0.0522 mg/1) of the spike amount(0.05 mg/1). RWQCB Staff Signature: Date: 20 March 2001