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0 2.0 SITE CONDITIONS <br />E <br />This section summarizes the site conditions regarding the stability analysis of the <br />proposed North County Sanitary Landfill. A more detailed description of the site <br />development is included in Preliminary Siting Report, North County Sanitary <br />Landfill, San Joaquin County, California, EMCON Associates, February 1988. <br />The field investigation and geologic and hydrogeologic conditions underlying the <br />site are fully discussed in Geologic and Hydrogeologic Report, Proposed Landfill <br />Development Site, San Joaquin County, California, EMCON Associates, <br />September 1987. <br />The proposed landfill is near the northeastern edge of the San Joaquin Valley. <br />The valley is a deep, asymmetric structural trough filled with sediments derived <br />from adjacent mountain ranges. The geology of the eastern portion of the San <br />Joaquin Valley is characterized by alluvial sediments deposited by rivers and <br />streams emanating from source terrains in the Sierra Nevada Mountains to the <br />east. <br />The youngest geologic units underlying the site are semiconsolidated alluvial de- <br />posits of the Turlock Lake and Riverbank Formations. The Turlock Lake and <br />Riverbank Formations consist of arkosic alluvial deposits of gravels, sand, silts, <br />and clays. Due to similar origins and common lithologies, differentiation of allu- <br />vial deposits into formations is difficult. <br />The proposed site is situated at the western edge of the Arroyo Seco Pediment <br />(Piper, et al., 1939). This geomorphic feature was produced by the Mokolumn <br />River and other streams originating in the Sierra Nevada Mountains. The sedi- <br />ments were described as fluvial (stream or river) deposits consisting of gravel, <br />sand, silt, and clay. <br />PJ9 9390217.00W 2 Rev. 0 May 23, 1989 <br />