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0 <br />SAN OAQUIN <br />5 d— ` _—COUNTY — <br />ar'llA. <br />January 31, 2018 <br />Mr. Todd Del Frate <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 Warks <br />Kris "all. Olrector of Punic Works <br />Fritz Buchman, Deputy Drrector/iJ9ae�tlprr ru <br />Michael Selling- Deputy t7ucYtOr i +a��aeNrrg <br />Jim Stones deputy Nectou'O,perabons <br />Nalee Zadt, lntenm Bus#wsS AUAr Ostr-" <br />SUBJECT: SECOND SEMIANNUAL AND ANNUAL 2017 GROUNDWATER AND <br />SURFACE WATER MONITORING REPORT, FOOTHILL SANITARY LANDFILL <br />Dear Mr. Del Frate: <br />Enclosed is the Second Semiannual and Annual 2017 Groundwater and Surface Water <br />Monitoring Report for the Foothill Sanitary Landfill, submitted in accordance with WDR No. R5- <br />2015-0058. <br />The water at all groundwater wells meets drinking water standards, and monitoring constituents <br />were generally consistent with previous monitoring periods. Below is a summary of the findings <br />for this monitoring period: <br />• MW -1A— No other General water quality parameters were exceeded during the 2nd <br />semiannual 2016 sampling events. <br />• MW -2R - No General water quality parameters were exceeded during the 2nd <br />semiannual 2017 sampling events. <br />• MW -3 - The concentration limits for sodium and bicarbonate were slightly exceeded <br />during the 3rd Quarter 2017 sampling event. Bicarbonate alkalinity was slightly <br />exceeded in the 4th Quarter 2017 sampling event. No other General water quality <br />parameters were exceeded during the 2nd semiannual 2017 sampling events. <br />• MW -4 — Monitoring well MW -4 was dry during the 2nd semiannual 2017 sampling events <br />and could not be sampled. <br />• MW -5 - No General water quality parameters were exceeded during the 2nd semiannual <br />2017 sampling event. <br />• MW -6 - No other General water quality parameters were exceeded during the 2nd <br />semiannual 2017 sampling events. <br />Although some concentrations slightly exceeded the tolerance limits, they are still within the <br />range of historical data. <br />VOCs were reported as non -detect in monitoring well MW -3 during the 3rd Quarter 2017. A <br />resample for VOCs was collected in September 2017 to confirm the non -detect results. One <br />VOC, trichloroethene, was reported at MW -3 during the resample at a concentration of 0.52 <br />fag/L (Table 2). One VOC, trichloroethene, was reported at MW -3 during the 4th Quarter 2017 at <br />a trace level concentration. VOCs were not detected in any other well during the 31 and 41 <br />Quarter 2017 sampling events. <br />1810 East Hazelton Avenue I Stockton, California 95205 1 T 209 468 3000 I F 209 468 2999 <br />