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City of Pleasanton 475 and 493 St. John Street Mixed-Use Project 26 LD-P.66. Conservation of the Arroyo del Valle. Require developers of future projects involving land within and adjacent to the Arroyo del Valle to implement the following measures to minimize potentially negative impacts to the Arroyo:  Coordinate with the appropriate environmental regulatory agencies and secure all required construction and grading permits.  Conduct an assessment of existing conditions, including topography, waterline location, trees, and other major natural site features.  Identify the existing plant and wildlife communities and species.  Prepare detailed channel/habitat restoration and enhancement plans for project impact areas that retain or enhance existing channel hydraulic capacity.  Prepare wildlife and habitat monitoring programs to ensure the long-term success of channel/habitat restoration and enhancement plans. The proposed project would be required to comply with the provisions of construction and grading permits, as outlined in the policy above. Although it is not anticipated that the project would require ground disturbance within the riparian corridor of Arroyo del Valle, the project applicant would be required to prepare a channel/habitat restoration and enhancement plan if Arroyo del Valle or its riparian habitat are impacted by construction ground disturbance or stormwater discharge. Additionally, state and federal wetland and waters protections such as Clean Water Act, Porter- Cologne Water Quality Control Act, and California Fish and Game Code would also apply, and the appropriate authorizations would be required to be secured prior to construction in coordination with the environmental regulatory agencies. Further, as described further in Section 4.9, Hydrology and Water Quality, the project would disturb more than one acre of land and the project applicant would be required to prepare a Stormwater Pollution Prevention Plan (SWPPP) pursuant to the National Pollutant Discharge Elimination System (NPDES) General Permit (Permit No. CAS612008). As described therein, compliance with state regulations would avoid and minimize erosion and contamination to the extent feasible by requiring erosion and sediment controls and runoff water quality monitoring. In operation, the proposed project would result in a net decrease in impervious surfaces compared to existing conditions, which would not generate additional stormwater runoff. Additionally, the project would involve irrigation of landscaped areas. Stormwater and irrigation water runoff into Arroyo del Valle could have an adverse effect on special status species, sensitive natural communities, and state and federally protected wetlands/waters. However, stormwater and irrigation water from the project site would be collected and directed to onsite bioretention areas and silva cells, and no water would be directly released into Arroyo del Valle. This project feature is consistent with Chapter 9.14, Stormwater Management and Discharge Control of the PMC; additionally, the project would be subject to the following DSP policy: LD-P.67. Best Management Practices. Require developers and business owners to operate projects to minimize impacts to the Arroyo.  Require the owners of new businesses that locate adjacent to the Arroyo to implement strategies to avoid trash and other waste from entering the Arroyo, including, covering trash cans so that wildlife cannot access them; properly disposing of food waste; and prohibiting dumping.