ALTAMONT LANDOWNERS SETTLEMENT - Laserfiche WebLink

39. 40. 41. 42. 43. excavation. ~he analyses would be able to address hidden instability conditions on the site. The purpose of the analyses shall be to determine potential hazards for cut slopes, refuse slopeS, and final cover. Measures shall be implemented to reduce specific identified slope instability hazards. These measures might include reducing the slope angle, keying slopes, buttressing unstable areas and excavation sequencing from higher- lying to lower-lying parts of unstable slopes. Similar verification shall occur for temporary refuse fill slopes for future fill sequences prior to construction of each cell. All slope stability investigations shall be conducted by a certified engineering geologist and/or registered geotechnical engineer. All final grading plans and slope stability analyses shall be reviewed by the County Grading Inspector prior to the start of liner construction. The proposed final topography shall be described in the Report of Disposal Site Information that would be submitted to the LEA as part of the application for a revised Solid Waste Facilities Permit. The LEA's approval of the application shall signify that the proposed topography meets all of the applicable Title 14 requirements. The operator shall establish permanent survey monuments on and in the immediate vicinity of the landfill to monitor long-term landfill settlement or lateral displacement. The monum{nts shall be periodically surveyed during the post-closure maintenance period. If the monitoring of settlement and displacement detects that more than anticipated amounts of movement of the monuments has occurred, an engineer or engineering geologist shall be retained to make specific recommendations for correcting the stability Problem. A record of the monument survey results shall be filed with the LEA. During the landfill development period, the operator's engineer shall conduct an investigation Cf slope stability, including active working area, filled and closed areas, and nearby areas that could affect the landfill whenever there is rainfall of more than six inches in a three-day period that follows an accumulated seasonal (October through April) total rainfall of 15 or more inches. The operator ?hall retain a qualified engineering geologist to conduct a site inspection to identify any Ipotential indications of instability and to provide recommendations to stabilize or m~nimize hazards of slope instability as soon as possible, but not longer than, one week following such a rainfall. A record of the engineering geologist's inspection and recomme~adations, and the operator's response plan shall be filed with the LEA and RWQCB. All offsite si}ope instabilities that could reasonably affect the landfill and perimeter drainage system shall be identified by an engineering geologist and corrected at the time that filling is carried out in that part of the Expansion area. At the time of the final closure plan, ho significant slope instabilities shall remain onsite or adjacent to the site that could reBult in damage to the landfill or the perimeter drainage system. The operator's engineering geologist shall submit documented proof of compliance with this requirement t~b the LEA and RWQCB. 15-B Final Altamont Settlement - Exhibit B