Laserfiche WebLink
Draft Supplemental Environmental Impact Report Page III-32 <br /> Forward Inc.Landfill 2018 Expansion Project <br /> Groundwater Monitoring <br /> The groundwater-monitoring system at the existing Forward Landfill is designed to detect the <br /> presence of contaminants in groundwater by analyzing groundwater chemistry at <br /> point-of-compliance wells. The monitoring system consists of 20 Detection Monitoring Program <br /> (DMP)wells and 40 Evaluation Monitoring Plan/Corrective Action Program(EMP/CAP) <br /> wells.The DMP wells are designed to detect a potential release from the landfill at <br /> point-of-compliance,while the EMP/CAP wells are used to evaluate changes in water quality and <br /> the effectiveness of the current corrective action measures. The 40 EMP/CAP wells were <br /> constructed as part of an on-going investigation. Figure IV.F-1 of the 2013 EIR shows the location <br /> of the monitoring wells. Groundwater monitoring is described in detail in the Hydrology and <br /> Water Quality Chapter of the 2013 EIR. After the 2013 EIR was prepared,Forward received <br /> approval from the Department of Toxic Substances Control and Regional Water Quality Control <br /> Board to install two replacement wells.Approval is still pending to abandon the three existing <br /> wells,all located along the main access road in an area that has been permitted to allow <br /> construction of a new waste management unit. <br /> Groundwater Control <br /> Two groundwater extraction wells with a combined design capacity of 305 gallons per minute <br /> (gpm)were originally installed to extract polluted groundwater at the Austin Unit. Three <br /> additional two groundwater-extraction wells were installed in 2009,however one of the <br /> groundwater extraction wells was not sufficiently deep for sustained pumping and is not currently <br /> in use. In addition,eleven offsite EMP/CAP wells have been constructed in 2017/2018. VOCs are <br /> removed using granular activated carbon(GAC)from the extracted water and the treated water is <br /> discharged to a recharge basin north of the North Fork of South Littlejohns Creek,where it <br /> recharges the underlying aquifer. The groundwater treatment system and discharge are regulated <br /> by the RWQCB under WDRs. <br /> Air Quality Control <br /> Landfill Gas <br /> The current landfill gas control system consists of a series of collection wells interconnected by <br /> above-ground laterals and a main header pipe connected to a flare station and electric generation <br /> plant. <br /> Until 2012,there were two active landfill gas(LFG)collection and conveyance systems(GCCS)at <br /> the Forward Landfill. One system consisted of 18 vertical extraction wells with three horizontal <br /> collectors and provided control for parts of the northern portion of the site (the former Austin <br /> Road Sanitary Landfill). Landfill gas from this 18-well system was conveyed to the formerly <br /> operating Covanta/Republic electric generation plant located at the northwest corner of the site <br /> (see Existing Landfill Storage and Support Facilities, above). The Covanta/Republic plant is no <br /> longer operational. The second GCCS encompassed the majority of the site,and consisted <br /> primarily of vertical gas wells, horizontal collectors and leachate collection risers.These two <br />