ARCHIVED REPORTS_2017_2 - Laserfiche WebLink

Home Browse Search

• VTREPUBLIC 11► SERVICES Mr. Brendan Kenny Engineering Geologist Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, Suite 200 Rancho Cordova, CA 95670 June 31,2017 RE: Forward Landfill—Second Quarter 2017 Dear Mr. Kenny: In accordance with WDR Order No. R5-2014-0006, Forward Incorporated (Forward) is pleased to submit this Second Quarter 2017 Monitoring Report for the Forward Landfill. According to the Forward Landfill Operations Manager, standard observations have been conducted weekly during the reporting quarter. The Forward Landfill Operations Manager also reported that no surface water was discharged from the facility during the monitoring period. During the second quarter 2017 monitoring period, no notices of violation (NOVs) were issued by the San Joaquin County • Environmental Health Department. However, Cleanup and Abatement Order No. R5-2017-0703 was issued by the Central Valley Regional Water Quality Control Board (RWQCB)to address continued VOCs in groundwater downgradient of the Austin Road Unit. For the Forward Unit, environmental monitoring for the second quarter 2017 indicate a non-statistical indication of release at well MW-2A as a result of two volatile organic compounds (VOCs) measured at trace concentrations; at well MW-16 as a result of one VOC measured at a quantifiable concentration; and at well MW-17 as a result of three VOCs measured at a quantifiable concentrations and three VOCs measured at a trace concentrations. Of note, these organic constituents have been previously confirmed and are currently in "Tracking Mode". For the inorganic monitoring parameters, concentration limits(CLs) were exceeded at wells MW-3, MW-10, MW-13, MWA5, MWA7, MWA8, MWA9, MW-22, MW-23R, and MW-24. With the exception of pH exceedances in wells MW-13 and MW-23R, all of the inorganic CL exceedances were placed in "Tracking Mode" and are being evaluated for temporal trends. For constituent concentrations in "Tracking Mode", increasing trends were calculated for barium, bicarbonate, calcium, magnesium, potassium, sodium, strontium at well MW-10; carbon tetrachloride at well MW-17; potassium and sodium at well MWA8; potassium at well MWA9; and potassium and sodium at well MW- 24. Surface water samples collected from the upstream and downstream surface water monitoring stations during the second quarter 2017 monitoring period were generally consistent with each other; no VOCs were detected and no CLs were exceeded. For vadose zone monitoring stations all of the soil- pore liquid samples were reported dry or there was an insufficient volume of soil-pore liquid for sampling. For the Austin Unit, environmental monitoring for the second quarter 2017 indicated a CL exceedance and/or non-statistical indication of release at Detection Monitoring Program (DMP) wells AMW-6 and AMW-12 during the monitoring period. The tetrachloroethene concentration measured at DMP well AMW-12 (6.6 ug/L) exceeded the state and federal MCL (5.0 ug/L) and also exhibited an increasing trend. In a letter dated July 31, 2017, the RWQCB was notified of the CL exceedances in wells AMW-6 and AMW-12. For the Corrective Action Program (CAP)/evaluation wells, 17 of 28 wells reported one or more VOCs exceeding a practical quantitation limit, with CAP well AMW-22S having the highest total