2020-107 - Gravity Sewer Conversion Project

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Septic to Gravity Sewer Conversion Project Final Initial Study/Mitigated Negative Declaration Letter 5 Response to Comments 5-1. The project proposes sewer and water connections at the intersection of 17'h Street and Deodar Street, as depicted in Figure 2. Project Location and Figure 3. Site Plan in the Draft IS/MND. This connection is estimated to be approximately 140 feet west of the SR 55 SB offramp to 17'h Street at its nearest point. The project does not anticipate a need to encroach on SR 55 right-of-way (ROW). 5-2. Regarding NPDES, development of the proposed project would abide by requirements of the statewide National Pollutant Discharge Elimination System (NPDES) stormwater permit for construction activity (Order 98-08 DWQ), Construction of the proposed project would be required to comply with the Construction General Permit, either through a waiver or through preparation and implementation of a Storm Water Pollution Prevention Plan (SWPPP). Best Management Practices (BMPs) are included as part of the Storm Water Pollution Prevention Plan (SWPPP) prepared for the proposed project and would be implemented to manage erosion and the loss of topsoil during construction -related activities. The project will implement standard construction operating procedures and will conform with NPDES requirements. The proposed project's grading/trenching plan would also ensure that the proposed earthwork is designed to avoid soil erosion. As a co-permittee under the County of Orange MS4 NPDES permit, the City will comply with the MS4 permit requirements. According to the project specific geotechnical report (AESCO 2019), regional groundwater data indicates groundwater in the project vicinity is generally less than 40 feet bgs, and groundwater was not encountered during the project subsurface investigations at a maximum boring depth of 15 feet. Because pipeline trenching activities are not expected to exceed 8 feet bgs, groundwater is not anticipated to be encountered during the excavation of the proposed improvements. 5-3. Regarding Permits, see response 5-1 regarding project proximityto the State ROW. In the event proposed work would need to encroach within the State ROW, the City will coordinate with Caltrans to assure that any additional documentation would be provided to support a permit. In addition, the City will provide Caltrans with an opportunity to review the project Traffic Control Plan (HAZ-1). Comments and Responses 2-17 November 2020