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3.9 Geology, Soils, Seismicity

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3.9 Geology, Soils, Seismicity 3.9 GEOLOGY, SOILS, SEISMICITY EXECUTIVE SUMMARY This section describes the types of soils present within the City’s Planning Area. Development constraints associated with soil hazards, subsidence, and geologic hazards are discussed along with City development standards. The City’s Planning Area consists of its incorporated boundaries and adopted Sphere of Influence (SOI). The County’s Planning Area consists of unincorporated land within the One Valley One Vision (OVOV) Planning Area boundaries that is outside the City’s boundaries and adopted SOI. Together, the County and City Planning Areas comprise the OVOV Planning Area. With implementation of the proposed General Plan goals, objectives, and policies and mitigation measures defined in this section, potential impacts from geology, soils, and seismicity would be less than significant. EXISTING CONDITIONS Soils Various soil types exist within the City’s Planning Area as shown on Figure 3.9-1, Soil Types within the City’s Planning Area. Saugus loam, 30 to 50 percent slopes, eroded (ScF2) is the most abundant type of soil within the City’s Planning Area with approximately 7,689 acres. A detailed description of each soil type found within the City’s Planning Area is presented in Appendix 3.9 of this environmental impact report (EIR) and corresponds with the soil types mapped on Figure 3.9-1. Each soil characteristic is identified to determine the Capability Classification of the soil on site, which in turn determines the predicted productivity of the soil if it were under agricultural production; the majority of the soils within the City’s Planning Area would be used for wildland/grazing areas, and would not be able to economically or physically sustain agricultural production. The following text describes the soil associations found within the City’s Planning Area. A soil association is a landscape that has a distinctive proportional pattern of soils. It normally consists of one or more major soils and at least one minor soil, and is named for the major soils. The soils in one association may occur in another association but in a different pattern. A soil series is the lowest category of the national soil classification system. The name of a soil series is the common reference term, used to name soil map units. The soil series are presented in this section by their location (i.e., Upland, Alluvial Fans, Alluvial Fans and Floodplains, Terraces, and Terraces and Foothills). Appendix 3.9 provides a cross-reference to the soil type and soil association. Impact Sciences, Inc. 3.9-1 One Valley One Vision Draft Program EIR 0112.023 City of Santa Clarita September 2010 3.9 Geology, Soils, Seismicity Saugus-Castaic-Balcom Association This association is located on foothills and mountains on gently sloping to very steep, well-drained soils that are loam to silty clay loam throughout; deep to moderately deep over soft sandstone or shale. Some area of this soil association is adjacent to Ventura County, and others are north and south of the Santa Clara River and its tributaries near Saugus. Saugus soils make up about 50 percent of this association. Castaic soils make up about 25 percent of this soil association and Balcom soils about 20 percent. Mocho, Sorrento, and other alluvial fans make up the remaining 5 percent of this soil association. Saugus Series (Uplands) Soils of the Saugus series are well drained and are located on uplands. These soils formed on weakly consolidated sediment that contained pebbles and cobblestones in some places. Slopes range from 15 to 50 percent. Elevations range from 1,300 to 2,250 feet. Vegetation consists of dense stands of chamise and candlestick yucca with an understory of annual grasses, forbs, and remnant stands of perennial grasses. Average annual precipitation ranges from 14 to 16 inches, average annual temperature is about 63 degrees Fahrenheit, and the frost-free season ranges from about 275 to 300 days. In a typical profile, the surface layer is grayish-brown loam about 15 inches thick. Below is grayish-brown loam about 15 inches thick. Below is grayish-brown loam underlain by weakly consolidated sediment at a depth of 42 inches. These soils are used for range and for homesites. They also are used for wildlife and watershed purposes.1 Castaic Series (Uplands) The Castaic series consists of well-drained soils that formed in material from soft shale and sandstone. These soils are located on uplands with slopes from 2 to 65 percent. Elevations range from 1,250 to 1,500 feet. Vegetation consists mainly of annual grasses and forbs, but stipa, a perennial grass, grows in small areas and brush grows in some places on north slopes. Average annual precipitation ranges from 14 to 16 inches, average annual temperature is 63 degrees Fahrenheit, and the frost-free season ranges from 275 to 300 days. In a typical profile the surface layer is pale-brown silty clay loam underlain by soft shale and sandstone at a depth of about 26 inches. These soils are used for dryland small grains and pasture, for range, for watershed, and as wildlife habitat.2 1 United States Department of Agriculture, “Soil Survey Antelope Valley Area California,” Soil Conservation Service in cooperation with University of California Agricultural Experiment Station, 1970. 2 United States Department of Agriculture, “Soil Survey Antelope Valley Area California,” 1970. Impact Sciences, Inc. 3.9-2 One Valley One Vision Draft Program EIR 0112.023 City of Santa Clarita September 2010 INTERSTATE SsB CmF Sa 26 26 7 26 12 26 7 21 GsC ReE RcD TsF CmESsB 7 TsF TsF ReE 5 SsB CmF2 7 19 RcB GsC CnG3 CmE RfBSa W SsA CmF2 MgB CmD ScE 8 1 TsF HcA VsE ZcC CnG3 ScF2 19 RcB GsC WgC CmEScF CnG3 CnG3 7 24 CmF ScF2 CnG3 HcC 24 GsC AmF2 HcC VsF TsF OgDScF2 CmF HcC HbC LdF CnG3 CmE CyC CkD HbD ReE OgC CmD MgB ZaC CnG3 12 CzC 7 AmF2 CnG3ScF2 Sa Sa ScF2 OgF OgC OgF LaE VsF SsB HcA ScE YoC AmF2 RzF CmE HcC OgC CnG3 HcCGsC RcD RfC CmE CmF YoC ScE OgC OgF MfC LaE CkC AmF2 MfC CmD OgC AmF2 RcD TsF GsC MfC ScE CnG3 CmE 15 OgCMpC GsC RcC HcC HcC TsF TsF CzC ScF ScF LaE GsA RcD AgF SsA OgF CnG3 HcC OgF OgC 1 RfB LaE LaECkD GsC RfB MpC YoC RcC LdF ScF MgB CnG3 OgC HcA RfBRfB SsA ScF2 ScF2 YoC SsB CkD ScE MfC ScF HcC 7 MpC OgF GaE2 WgC Sa CmF2 766 LdF RhF CkD LIFORNI CkD GsC A A CnG3 C MfA ScE ScF2 OgC 15 1HcA CkD 7 LaE Co LdF ZaC CyA MfC 19 19 OgF MpCCyC MpC CnG3 YoC CkC 126 ScEHcC 19 GaF2 RcD RhF HcC ScE HcC OgCOgC CmF2 GP YoC HcC ScF2 YoC MfCScE CnG3 SsB AmF2 HcAMpA CkD RhF ZaC MfC ScF CmF CkC TrF HcC ScF2 CnG3 MpC HcC CkC CmF2 MpC AgF GaF2 YoC RhFGaF2 CkD CyA RfB MfC YoC MfC CmF2 CmE CkC Sa CnG3 SsB OgC MpCMpC CmE CkD RhF CmF2 YoC CmF2 YoC SsB CmEMfC CkC MfC MpC CkD ZaC ScE MfC MfC MfC CmF2 CnG3 CkC RhF MfC YoC CmF HcC CnG3 ScF CkC HcC MfA HcC VcA CkC ALIFORNIA ScF2 C MfC MfA CyAMfC MpCCyA VcA OgC MhF2 CnG3 ScF HcA ZaD YoC SsB MpC AgF CkD HcC HcC CyC CzC CnG3 CkC 126 CyA HcC MfC MgB ZaC MpC VbB YoCOgCHcC HcC CnG3 CkC CmF MgB HcC ScE YoA HcCCmF2 CmF2 CmF2 MpC YoCYoC OgC ZaC HcC MpC HcC CyC ScE CnG3 CmE GaF2 YoC CmF OgC YoC OgD CmF CmF2 ScF2 MfC MgB YoC ScF CmE MpC HcC AgF CmF ScF2 CyC YoC CnG3 CkD CyA CyC ScE CyAHcA YoC HcC HcC YoC OgC OgD CkD CkCHeC YoC YoC HcA CzC CnG3 MpC MfC MfC CnG3 CyC CkD ScF HcC ScF2Rg HcC YoC MpA MfAYoC CnG3 CkC MhF2 OgD Sa YoC MfC CnG3 SsB MgA HcC INTERSTATE CmE HcC MfC MpASsA YoC CnG3 HcC HcC OgF ScF2 YoC MhF2 OgC ScF2 HcC HcC HcC YoC HcA CnG3CnG3 MhE2 5 SsB CmF2 CmF2 YoA ScE HcCMfC HcC CzC CyC HcC CmF ScF HcC HcC AgF CmD HcC HcA YoC OgCOgEMfC HcA OgD OgE HcC OhF OgC YoC SsB HcC CnG3 OgF ScF2 CnG3 HcA ZaC HcC HcC MfA OgE OgD ScF2 CyC Sa MpC YoC CnG3 CzC HcA ScF2 CnG3 HcC CmF2 HcA YoA HcC HcC OgC YoC ZaC YoC MfC CyA OgD OgDOgE CzC CnG3 CnG3 MfA ScF2 MfC HcC HcC CnG3 CnG3 MhF2OgF CmF2 SsB HcC CnG3 MfC HcC OgC OgE ScF2 OgC CnG3 CnG3 HcC HcC FOR HcC HcC OgC ALI NIA MgB C HcC OgC HcC ScF2 CyA HcCSsB MgB MfC MfC MgB MfAHcA ScF OgE CzC OhF HcC CmECyCSaZaC OgC OhF CnG3 CnG3 AmF2 14 HcC CmF2 SsB OgD HcC HcC CnG3 HcC MpA SsB YoC ScF CmF CnG3 HcC MfA CyA HcC OgE CzC 24 HcC MoA HcA MgA MfC OgC OgF OgC OgC CnG3 HcC OgC CnG3 ScE MfC OgC OgE CyCOgD CnG3 21 AmF2 Sa HbC CmG2 MfA MfA MgB MpC OgD HcC MfC OgE HcC SaAmF2 HcC CyA ScF OgC CnG3 CyA CzCCzC 21 AmF27 CmF2 SsAHcC MgB ScF OgC HcC OgC 21 HcC CyA MpA YoC MpC HcA ScF2 OgEOgC OgF2 OgC CyC 21 Sa HcCCmF2 OgC OgC ObC AmF2 CmG2 CmF2 CyAHcA MoA HcCMfC YoA MfC OgC GP ScF OgE CzC OgC CnG3 Sa CyA OcC SaMfC ALIFORNIA SsA C Sa TsFZaC MpA TsFZaC MgAYoA HcC MfC YoC ScE ScF2 HcC AmF2 CnG3 CmE SsA HcC OgF OgE CyC CyA OgF ScF2 HcC ScF2 Sa AmF2 ScF HcC CmF2 ScF2 HcCHcC HcC MfC OgC OgD OcC 54 14 HcC MpA HcA HcA HcC OgC OgC OgD OgC HcC 2154 HcCSsA SsB CmD Sa OgE OgE OgCOgC Sa Sa OcC MfA CyA Sa OgE OgC CyCOgC Sa CyA ZaC MgA OgD MfA OgD OgCOgC Sa HcA MpC CyA HcC OgF Sa CyA CyC OgC Sa ScF2 MfA Sa OgC MfA TsF HcC HcAScF2 MfA Sa OgC Sa MfC OgC MfA ScF2 HcC SsA CmF SsA CyA HcA OgE OgCOgC HcC Sa Rg TsF CnG3 OgC OgC Sa OgF MfA OgC OgC HcC MfA MgB LIFORN OgF CA IA Sa MgB W YoA HcA Sa ScF2 CyA ZaC CyC ScF2 19 YoA YoC MfA HcC 14 ZaC MfC YoC CmF MgB HcC Sa HcA ZaC HcC Sa YoC HcA Sa SaMpAHcA OcC MpA ZaD TsF ScF2 ScEScF HcC OgC HcC OdA ZaC ScE YoC CmE CyAHcA SsA MfA CyA ScF2 ObA MfC HcC YoC OgC HcC ZaC OdC ScF2 SsB ZaC ScF HcC OgE HcC MfA HcC 39 CnG3 SsB YoC HcC SsB Sa Sa HcC ObCObC SsA OgC CyA SsB HcA ScE ScE YoC 86 ZaD ScE CmE MgB HcA ScE MgB 39 ZaC HcC HcC HcC YoC YoC OgC YoC Sa ScE YoC HcC HcA HcC YoC ScF2 CmF CnG3 CmD OgE OgC YoC 19 ScF OzE ZaC ScF2 MgB YoC OgC CnG3 HcC CmECmE HcC OgF YoC YoC OgC Rg CmE ScF ScE YoA GaF2 CnG3 ScE MgBHcC Sa YoC OgE OgE CmE HcC MfA 19 YoC YoA Sa ScE
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