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Water Quality Monitoring Report <br />Forward Landfill <br />0 4.4 Forward Unit <br />4.4.1 Groundwater <br />Groundwater elevations measured during the 2014 monitoring year were variable, <br />reflecting seasonal precipitation patterns. The variable pattern in groundwater <br />elevations in 2014 mimics annual patterns over the monitoring history. Hydrographs <br />depicting historical groundwater elevations are presented in Appendix G and indicate <br />generally static trends with some declines over the past two years. During the 2014 <br />monitoring year, the groundwater flow direction beneath the Forward Unit varied with <br />a hydraulic gradient ranging from 0.001 ft/ft to 0.003 ft/ft. In the northeast corner of <br />the site, groundwater was noted to flow south-southwest at a hydraulic gradient of <br />0.010 ft/ft during the first and second quarters. The south-southwest gradient was first <br />noted during the May 2011 monitoring event and is believed to be related to <br />groundwater mounding as a result of landscape irrigation at the entrance of the landfill. <br />However, regionally the groundwater gradient is to north and northeast toward the <br />Austin Unit. <br />Groundwater quality conditions beneath the Forward Unit during the 2014 monitoring <br />year are generally similar to those observed in previous monitoring years. Although <br />several CL exceedances were noted, none of the CL exceedances were consistently <br />exceeded over the 2014 monitoring year. The following table summarizes inorganic CL <br />exceedances during the 2014 monitoring year. <br />Forward Unit CL Exceedances for 2014 Monitoring Year <br />Inorganic Constituents <br />Well <br />Constituent <br />2014 Monitoring Period(s) CL <br />was Exceeded <br />Mw -1 <br />Calcium, Potassium, <br />3` <br />Strontium <br />MW -2A <br />Sodium <br />3` <br />MW -3 <br />pH <br />2" <br />MW -10 <br />Calcium, Potassium, <br />3` <br />Strontium <br />MW -13 <br />Potassium, Sodium, <br />3` <br />Strontium <br />MW -14 <br />Nitrate <br />1St & 2" <br />MW -15 <br />Calcium, Potassium, <br />3` <br />Sodium, Strontium <br />MW -17 <br />TDS <br />2" <br />Calcium <br />3` <br />MW -19 <br />Calcium, Magnesium <br />3` <br />MW -23R <br />pH <br />2" <br />MW -24* <br />Sulfate <br />1St & 3` <br />Notes: * - Background Well. <br />M:\ 2014.0012\FA_4Q14.docx 15 <br />1/28/2015, Rev. 0 <br />