SU0011836 - Laserfiche WebLink

Home Browse Search

r Draft Supplemental Environmental Impact Report Page IV.G-21 Forward Inc. Landfill 2018 Expansion Project is designed for 0.00055 ft/ft which translates into a ground surface profile along the alignment a channel depth between 10 and 12 feet. • The appropriate responsible agencies must review and approve the updated April 2018 design for the relocation of the South Branch of South Littlejohns Creek. Implementation of these procedures would reduce the impact to a less-than-significant level. Mitigation Measure G.5: None required. Impact G.6:Adding significant new landfill volume could potentially contribute to the known VOC-contaminated plume and other groundwater contamination. The new expansion would add approximately 8.1 million CY over the additional 17.3 acres of landfill in the stages proposed,which would allow for more leachate generation over time. This additional leachate could potentially contaminate the underlying groundwater.This is because additional waste accumulation could result in some additional risk of potential spills, leaks, and leachate control failures, despite the controls in place.Thus, the project could contribute over time to the known VOC-contaminated plume associated with the unlined portion of the former Austin Road Landfill extending north and northeast from the northern edge of the landfill border, and associated potential to contaminate groundwater.That could result in the need to ' continue to supply water to affected offsite users for a longer time period. The following measures are proposed as part of the project to minimize this potential impact: • Forward Landfill has agreed to a short-term and long-term mitigation of the offsite impacts of the existing VOC plume,to provide an alternative source of drinking water to those residents in the downgradient area who are using domestic water wells for drinking water ' and whose domestic wells may be adversely affected by the VOC plume.A long-term solution currently being investigated by Forward to assist those residents on Newcastle Road,who are already being provided with bottled drinking water by Forward, is for Forward to provide the property owners on Newcastle Road in the footprint of the downgradient plume with municipal piped water to replace the current use of the supply wells; • The residences on Newcastle Road would continue to be supplied with bottled water until municipal piped water is provided; • Residents on Austin Road would continue to be supplied with bottled water from the City of Stockton until municipal piped water is provided. • Because of the potential for impact from the plume to the downgradient receptors determination of the sampling program frequency and any changes to it,along with the appropriate mitigation,is the responsibility of the RWQCB and must be carried out under their permit authorization; and • The groundwater capture and remediation system could be augmented to capture the current offsite plume to the satisfaction of the RWQCB based on their review of future source control reports. r r