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SAWMAQUi� <br />r — C O U N T Y_,,,_�__. <br />caPr �r-ectne55 grows trere. <br />• Department of Public Works <br />W Kris Balaji, Director of Public Works <br />Fritz Buchman, Deputy Director/Development <br />Michael Selling, Deputy Director/Engineering <br />wc"g ON YOU Jim Stone, Deputy Director/Operations <br />Najee Zarif, Interim Business Administrator <br />July 27, 2017 <br />Mr. Todd Del Frate, PG <br />Engineering Geologist <br />Central Valley California Regional Water Quality Control Board <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, California 95670 <br />SUBJECT: FIRST SEMIANNUAL 2017 GROUNDWATER AND SURFACE WATER MONITORING <br />REPORT, NORTH COUNTY RECYCLING CENTER AND SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed is the First Semi-annual 2017 Groundwater and Surface Water Monitoring Report for the North <br />County Recycling Center and Sanitary Landfill (NCRCSL), submitted in accordance with Waste Discharge <br />Requirements R5-2010-0016. <br />Below is a summary of the findings: <br />Two new groundwater monitoring wells (G-7 and G-8) were installed between November 28 and December <br />13, 2016, and were developed on December 15th and 16th. The wells were first sampled on February 7, 2017, <br />and the results are included in this report. <br />Because of the dry groundwater monitoring wells on the western side of the landfill (G -2A, G -3D, G-4, G -5A, <br />and G-6), the County proposes to deepen two (2) of the dry wells (G -3D and G-6). The County is also going <br />to install a new well G-9 on the western side next to the new module 5B (currently under construction). This <br />new well along with the two deepened wells will give NCRCSL three (3) downgradient wells on the western <br />side of the facility. Prior to the existing wells going dry, no indication of impacts were observed along the <br />western side of the site, thus the 3 new wells should adequately address the detection monitoring program. <br />All concentrations of field and monitoring parameters were below established concentration limits in wells G-7 <br />and G-8 during the 1St semi-annual 2017 monitoring period. Samples could not be collected from wells G-1 A, <br />G -2A, G -3D, G-4, G -5A or G-6 during this monitoring period due to low water levels. However, water level <br />measurements could be collected in these wells for determining the groundwater flow direction. <br />VOCs were not detected in any groundwater monitoring wells sampled during this period. <br />The lysimeters did not yield enough water for sampling, indicating no detectable leaks from the liner in those <br />areas. Unsaturated zone monitoring will continue in accordance with the WDRs. <br />Results of leachate monitoring are consistent with past leachate monitoring events. The 1 St semiannual <br />leachate monitoring event occurred on January 25, 2017. Twenty eight (28) different VOCs were reported in <br />the leachate samples. The highest VOC concentrations reported were those of xylenes, naphthalene, and <br />some of the benzene compounds. <br />1810 East Hazelton Avenue I Stockton, California 95205 1 T 209 468 3000 I F 209 468 2999 <br />