ARCHIVED REPORTS_2017_3 - Laserfiche WebLink

Home Browse Search

Water Quality Monitoring Report Forward Landfill calculated for CWLAM constituents (total nitrogen, arsenic, iron, and manganese). As shown on 3- 4, WQPS were exceeded for manganese in well AMW-10, and iron and manganese in wells AMW-13 during the fourth quarter 2016 monitoring period. In a letter dated January 23, 2017, the RWQCB was notified of the CWLARA CL exceedances and retesting is scheduled for January 2017. 3.1.7 Domestic Well Monitoring Two domestic wells (8106-A and 7898-A) were sampled on October 26 and 27, 2016, respectively. Table 3-5 summarizes the current analytical results for the domestic well samples collected. Tetrachloroethene was measured above the PQL in both domestic well samples and cis-1,2-DCE, DCDFM and TCE were also measured above their PQLs in the sample collected from well 8106-A. Estimated trace concentrations of one VOC (each) were also measured in the domestic well samples. 3.1.8 Vadose Zone Monitoring The current vadose-zone monitoring network at the Austin Unit consists of seven lysimeters. The lysimeter locations are shown on Figure 3-1. As shown on Table 2-5, with the exception of FU -04W, all of the lysimeters were reported dry. However, there was insufficient soil -pore liquid (4 milliliters) for analysis. 0 3.1.9 Leachate/Surface Impoundment Monitoring For the Austin Unit, leachate sumps and surface impoundments are inspected weekly by Forward Landfill personnel. If leachate is detected in a sump, it is pumped into the surface impoundment WMU F (West) for evaporation. During the fourth quarter 2016, leachate was observed at holding areas WMU FU -03, WMU FU -04, WMU FU -05, WMU FU -06, WMU FU -13, and WMU FU -14 and a total of 358,200 gallons of leachate was removed from the lined areas at an average rate of 3,936 gallons per day. For surface impoundment WMU-F (West) Freeboard ranged from approximately 7.33 to 7.67 feet during the fourth quarter 2016 monitoring period. Appendix A presents copies of the leachate observation logs, freeboard observation logs, and surface impoundment monitoring log. Leachate samples were collected on a quarterly basis and analyzed in the field for pH, specific conductance, temperature, and turbidity. In addition to quarterly monitoring, leachate is sampled annually during the fourth quarter monitoring period for the parameters listed in Table 2-1. The results of quarterly field monitoring measurements and analytical results for the fourth quarter 2016 are presented in Table 3-7. As shown on Table 3-7, six VOCs were detected in the Austin Unit leachate sample. Project No. 2016.0007 1 Water Quality Monitoring Report 13 January 2017