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3 – Project Description Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 3-6 3.4.4 Utility Improvements A new, engineered stormwater drainage system would be constructed on the Project site to collect and treat on -site stormwater. After development, a majority of stormwater from the Project site would drain into three below-grade, open, earthen infiltration basins within the north portion of the site. Stormwater flows would be conveyed via sheet flows away from buildings and, where possible, through below-grade, landscaped areas prior to entering the nearest catch basin and subsequently being conveyed to the three earthen detention basins. The landscaped areas would act as the first filter for detaining suspended solids in stormwater flows. The detention basins would be planted with native grasses and erosion control vegetation along their side banks. Stormwater flows collected by the detention basins would be allowed to infiltrate into the soils, recharging the underlying groundwater basin (San Joaquin Valley Basin). The Project and its new stormwater drainage system would be sized to capture and treat all on -site stormwater generated by two consecutive 10-year, 24-hour storm events, as required by the County. The detention basins would feature an earthen bottom that would allow flows collected by the detention basins to infiltrate into the soils and recharge the underlying groundwater basin. Domestic, irrigation, and fire suppression water would be sourced on the Project site through the installation of two on-site water wells. The Project would include a 500,000-gallon aboveground water storage tank that would be reserved for fire suppression uses only. Wastewater generated by each of the three buildings would be directed to individual on -site septic tanks and associated leach fields. 3.4.5 Project Construction Construction is expected to commence in 2021 and would last through 2022. It is anticipated that soil quantities would be balanced on site during grading activities. Based on information provided by the Project applicant, it is assumed that construction of the Project would commence in or around July 2021 and would last approximately 10 months, ending in or around April 2022. The analysis contained herein is based on the following assumptions (duration of phases is approximate): • Site Preparation: 2 weeks (July 1, 2021 – July 15, 2021) • Grading: 1 month (July 16, 2021 – August 31, 2021) • Building Construction: 7 months (September 1, 2021 – March 30, 2022) • Paving: 1 month (April 1, 2022 – April 30, 2022) • Architectural Coating: 3 months (February 1, 2022 – April 30, 2022) Grading would include 37.47 acres and balanced cut and fill. The construction equipment mix and vehicle trips used for estimating the Project-generated construction emissions are shown in Table 4.1-6 in Section 4.1, Air Quality.