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W • • Draft Supplemental Environmental Impact Report Page IV.G-24 • Forward Inc. Landfill 2018 Expansion Project The impact from the loss of direct infiltration over the expansion area is considered to be less 0 than significant. • Mitigation Measure G.7: None required. Impact G.8. Increased sedimentation during the construction phase of the relocation of the . South Branch of South Littlejohn Creek. Construction and operation of the relocated South Branch of South Littlejohn Creek channel could result in additional sedimentation and surface water quality impact during the construction phase and shortly thereafter if appropriate BMPs to minimize such impact are not • adhered to. Constructing the Creek alignment during the dry season would be minimize any • sedimentation and water quality impact. Mitigation Measure G.8: Implement the proposed Questa Engineering design specifications • and standard construction BMPs during the construction phase of the South Branch of Sough • Littlejohn Creek realignment. Construction of the realigned creek channel shall be implemented during the dry season. • The proposed mitigation would reduce potential impact of sedimentation from the proposed • creek alignment to a less-than-significant level. 40 Impact G.9: The proposed expansion would result in the removal of existing groundwater • monitoring wells, which could hinder early detection of potential groundwater • contamination. Currently, groundwater monitoring wells MW-17, MW-18, and MW-19 are located in the • planned area of WMU FU-19. The need to relocate these monitoring wells was addressed • previously in the 2013 EIR(as well as earlier EIRs) and found to have a less-than-significant impact once mitigated. The mitigation measure required the installation of replacement wells for two of the three wells. The well closures and replacements were approved by the RWQCB in • March 2018, and are therefore considered part of the proposed project. Therefore, the • loss/relocation of monitoring wells is considered a less-than-significant impact. Mitigation Measure G.9: None required.