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n <br />u <br />'0'13 "0 SANJOAHIN <br />—COUNT Y— <br />:L" greatness grows here. <br />July 30, 2018 <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 95670-6114 <br />Is <br />Department of Public Works <br />Kris Balaji, Director of Public Works <br />Fritz Buchman, Deputy Director/Development <br />Michael Selling, Deputy Director/Engineering <br />Jim Stone, Deputy Director/Operations <br />Kristi Rhea, Manager of Strategic Initiatives <br />SUBJECT: FIRST SEMIANNUAL 2018 GROUNDWATER AND SURFACE WATER MONITORING <br />REPORT, FOOTHILL SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed is the First Semiannual 2018 Groundwater and Surface Water Monitoring Report for the <br />Foothill Sanitary Landfill, submitted in accordance with WDR No. R5-2015-0058. <br />The water at all groundwater wells meets drinking water standards, and monitoring constituents were <br />generally consistent with previous monitoring periods. Below is a summary of the findings for this <br />monitoring period: <br />• MW -1A -No general water quality parameters were exceeded during the First Semiannual 2018 <br />sampling event. <br />• MW -2R - No general water quality parameters were exceeded during the First Semiannual 2018 <br />sampling events. <br />• MW -3 - The concentration limit for bicarbonate was slightly exceeded during the First Quarter <br />2018 sampling event. The concentration limit for sodium and bicarbonate alkalinity were slightly <br />exceeded in the Second Quarter 2018 sampling event. No other general water quality parameters <br />were exceeded during the first semiannual 2018 sampling events. <br />• MW -4 — Monitoring well MW -4 was dry during the First Semiannual 2018 sampling event and <br />could not be sampled. However, new deeper Well MW -4A is proposed to be installed to replace <br />MW -4. <br />• MW -5 - No general water quality parameters were exceeded during the First Semiannual 2018 <br />sampling event. <br />• MW -6 - No general water quality parameters were exceeded during the First Semiannual 2018 <br />sampling event. <br />Although some concentrations slightly exceeded the tolerance limits, they are still within the range of <br />historical data. <br />VOCs were reported as non -detect in monitoring well MW -3 during the First Quarter 2018. One VOC, <br />trichloroethene, was reported at MW -3 during the Second Quarter 2018 at a trace level concentration. <br />VOCs were not detected in other wells during the First and Second Quarter 2018 sampling events. <br />1810 East Hazelton Avenue I Stockton, California 95205 1 T 209 468 3000 I F 209 468 2999 <br />