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3. Hydrology <br /> The London Borrow Pit is outside of any floodplains along the riparian corridor of Mosquito <br /> Creek. No groundwater will be interacted with during mining. All surface water runoff will be <br /> collected in the pit and processing area floors for infiltration and evaporation during mining <br /> operations. The operator is committed to protecting the hydrological balance and water quality <br /> at the site. <br /> 3.1 . Water Quality Protection <br /> The primary concerns surrounding water quality protection at the London Borrow Pit site are the <br /> potential impacts to the surface and groundwater from sediment, hydraulic fluids, and diesel <br /> fuel. Sediment will be controlled through the use of stormwater retention within the disturbance <br /> area through the life of the mine. The site will be graded in a manner that maintains all surficial <br /> flows within the disturbed area, in turn containing all sediment and unwanted discharges from <br /> leaving the site. Hydraulic fluids and diesel fuels will be contained within vehicles or with <br /> adequate storage methods that follow best practices of maintenance; these practices including <br /> regular inspections of vehicles, hydraulic lines, and any other potential spill sources. Diesel fuel <br /> will not be stored onsite. An SPCC plan will be in place to prevent oil discharges and establish a <br /> response procedure in the event of spills. <br /> Any surface water discharges from the site will be sampled in accordance with the NPDES <br /> discharge permit. Typical surface water discharge sampling analytes are listed in Table B-1. All <br /> discharge will be via the approved Outfall, the proposed location of which is shown on Map E-2. <br /> London Borrow Pit <br /> April 2024 B-3 Lewicki&Associates <br />