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0 GeoSyntec Consultants <br />Some initial erosion, rilling, or rutting of the vegetative cover soils should be <br />expected in the first few wet seasons after the construction of the cover. In addition, <br />some sedimentation should be expected within the v -ditches, at the entrances to the <br />flared end sections, and within the drainage pipes. Repair of this potential erosion <br />damage or sediment build up will be addressed by Forward personnel under the <br />Post -Closure Maintenance Plan (see Section 4). While the organic layer will help <br />minimize rainfall induced erosion, erosion due to surficial flow will only be minimized <br />after the establishment of native grasses within the vegetative layer and v -ditches. <br />3.4.5 Landfill Gas Control <br />(E) Landfill gas monitoring and control measures pursuant to Article 6, <br />Subchapter 4, Chapter 3 (§20920 et seq.); <br />The current landfill gas monitoring and control activities (see Section 2.2) will <br />continue into the 30 -year, WMU B post -closure maintenance period. The monitoring <br />will also include periodic gas survey monitoring of remaining on-site structures <br />adjacent to the waste fill, such as subsurface vaults, manholes, buildings or sheds, and <br />other areas which may have a potential for gas build up. Results will be reported to <br />applicable regulatory agencies on a quarterly basis unless Forward receives written <br />authorization to discontinue gas monitoring. <br />SCS Engineers of Dublin, CA has reviewed applicable regulations and landfill gas <br />monitoring results to determine if a landfill gas collection and control system is <br />necessary for the WMU B closure. They found that the Forward landfill qualifies for a <br />5 -year deferral for a landfill gas control plan and installation. The need for a gas <br />collection system at the landfill will be re-evaluated in the summer of 2004. The <br />SCS Engineers' letter report is included in Appendix A. <br />3.4.6 Leachate Monitoring <br />(F) Leachate monitoring and control measures pursuant to §21160; <br />The current leachate monitoring and control activities (see Section 2.2) will <br />continue into the 30 -year, WMU B post -closure maintenance period. WMU B is <br />unlined and does not contain a leachate collection and removal system. Leachate <br />collected from the other on-site WMUs is currently pumped to a Class II leachate <br />J:\ALLIED\FORWARD\CLOSUREPLAN\REPORT 3-14 99.11.30 <br />