CORRESPONDENCE_1992-2002 - Laserfiche WebLink

Home Browse Search

SCH V92092072 raft EIR , .Lovelace Transfer Station Expansion Project Page 4 Chanter 11.0 - NOISE The Draft EIR discussed current vs . projected noise levels for the project . It would be helpful if the Final EIR included a description of minimum distances for location of structures and a list of worker health and safety equipment to be used by staff for noise mitigation. Chanters 9.0 & 16.0 - -WATER QUALITY Page 9-1 of the Draft EIR states : Runoff water entering the retention pond will be allowed to evaporate and percolate. The groundwater table lies approximately 28 feet below the ground surface. Given a retention pond depth of 8-ft. , the bottom of the retention pond would lie approximately twenty feet above the groundwater table. (Kleinfelder, 1993) The exploratory boring at the retention pond location show that a silty clay (CL) material lies between the pond bottom and the groundwater table. (Kleinfelder 1993) Thus the percolation of water downward is expected to be slow. No further discussion of the permeability or subsurface soil characteristics were given or referenced in the Draft EIR. Board staff request that the Final EIR identify the actual soil permeability/hydraulic conductivity values in centimeters/second (cm/sec) for the silty clay material between the pond and water table. This information is essential to the long term protection of groundwater beneath the project. site, particularly when the Draft EIR stated it is adjacent to an abandoned landfill . Page 16-1 of the Draft EIR states : During construction of the proposed facility it is anticipated that material from a prior landfill operation will be excavated and transported for off-site disposal . The exploratory program performed by Kleinfelder found old landfill material at the northerly border of the site in the eastern portion. The material underlies planned roadways and the commercial scale. The, full extent of the landfill was not defined but it is known to exist for a length of at least 200 feet along the border and to a maximum depth of approximately 9 feet . It is proposed to excavate and dispose of the old landfill material off-site. However, it is anticipated that the landfill material will be present at the northern site boundary. Therefore, it will be necessary to lay the landfill material back to accomplish a 9-foot excavation at the site boundary. This sloped layback will extend to within 5-feet of the property line. . .The excavation area will be backfilled with on-site soils.