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Administrative Draft Environmental Impact Report Gill Medical Center Project important that foundation systems be capable of tolerating or resisting any potentially damaging soil movements. In addition, it is important to limit moisture changes in the surficial soils by using positive drainage away from buildings as well as limiting landscaping watering. According to the NRCS Web Soil Survey, the soil at the Project site have a high shrink-swell potential. The NRCS Web Soil Survey indicated that near surface soils within the Project site have medium plasticity, and the expansion potential of the soil would respond to fluctuations in moisture content.Adherence to existing codes and regulations and implementation of the policies and implementation measures contained in the Health & Safety Element of the General Plan would ensure appropriate foundation design for site specific conditions. Additionally, a Geotechnical Report will be prepared prior to project construction and would include recommendations to address site conditions.Therefore, expansive soil impacts are less than significant with adherence to adopted General Plan policy applicable development standards. Mitigation Measures None required. Impact 4.9-4: The project could be located on soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water. Impact Determination: No Impact Threshold: Located on soils incapable of supporting the use of septic tanks or alternative waste water disposal systems (where sewers are not available). As discussed in the Chapter 3.0 Project Description and Section 4.12 Hydrology and Water Quality, onsite septic is not proposed. Rather, the Project proposes a "package plant"for onsite wastewater treatment. In addition to typical wastewater treatment, the proposed package plant would be specifically designed to treat hospital use liquid medical waste. Project generated wastewater would be treated to a level that qualifies for National Pollutant Discharge Elimination System (NPDES) permitting with Waste Discharge Requirements (WDRs) issued by the Regional Water Quality Control Board. This level of treatment will allow for either discharged to surface waters or onsite reuse for landscape irrigation, reflecting ponds, and/or agricultural use. Because the Project does not require septic tanks or alternative wastewater disposal systems that rely on infiltration,there would be no impact. Mitigation Measures None required. Impact 4.9-5: The project could be located in an area that contains subsurface unique paleontological resources or geologic features. Impact Determination: less than significant with mitigation incorporated Threshold: Located in an area that is known to have unique paleontological resources or geologic features. Geology and Soils 4.9-10 October 2021