CORRESPONDENCE_2006-2007 - Laserfiche WebLink

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San Joaquin County Environmental Checklist (horizontal)expansion of the existing landfill footprint,nor any immediate changes to landfill operation,the project involves the vertical expansion of the landfill and could expose people or structures to potential landslides related to fill slope geometry. The final fill slopes of the landfill will be required to be engineered, constructed,and maintained in accordance with the landfill's Preliminary Closure/Postclosure Maintenance Plan,which would be amended to reflect the increase in permitted fill height. Furthermore,landfill operators establish vegetation and construct drainage berms or benches on surfaces as they near final elevation. BMPs are also implemented at the landfill as required under the NPDES permit(refer to Section VIII,Hydrology and Water Quality, for more information on NPDES permits). Compliance with the requirements of the NPDES permit, including the implementation of BMPs and the engineered design of the final fill slopes,developed in compliance with Preliminary Closure/Postclosure Maintenance Plan requirements,will ensure that the potential for landslides to occur as a result of the proposed elevation increase are reduced to less-than-significant levels. No mitigation is necessary. b. Grading,excavation,removal of vegetation cover,and loading activities associated with increasing the height of the landfill walls could temporarily increase erosion and sedimentation. Construction activities could also result in soil compaction and wind erosion effects that could adversely affect soils and reduce the revegetation potential at the construction sites and staging areas. To control erosion and sedimentation,a SWPPP would be developed by a qualified engineer or erosion control specialist and implemented as part of the project. The SWPPP would be kept on site and would be made available upon request to representatives of the Central Valley Water Board. The objectives of the SWPPP would be to(1)identify pollutant sources that may affect the quality of stormwater associated with construction activity and(2)identify,construct,and implement stormwater pollution prevention measures to reduce pollutants in stormwater discharges during and after construction. Accordingly,the SWPPP would include a description of potential pollutants,management of dredged sediments, and hazardous materials present on site during landfill operations (including vehicle and equipment fuels). The SWPPP would also include details of how the sediment and erosion control practices,referred to as BMPs,would be implemented. Implementation of the SWPPP would comply with state and federal water quality regulations.No mitigation is necessary. C. Depth to groundwater in the area is relatively deep,and the area is partially underlain by somewhat poorly consolidated,water-saturated fine sands and silts. However,because the ground-shaking hazard in the area is considered low,the susceptibility of soils and sediments to liquefaction is also considered low. Potential impacts are considered less than significant. No mitigation is necessary. d. The landfill property is not located on expansive soil,as defined in Table 18-1-B of the UBC(1997). Potential impacts related to risks to life or property from construction on expansive soils would be less than significant. No mitigation is necessary. Notice of Preparation for the June 2006 North County Recycling Center and Sanitary Landfill 2-44 J8S 06307.06 Permit Revision