2019-05-06_PERMIT FILE - M2019022

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PART I Permit No.: COR400000 that has buffering capacity prior to reaching groundwater, as necessary to meet the effluent limits in this permit, including Part 1.B.3.a. The concrete washout location shall be not be located in an area where shallow groundwater may be present and would result in buffering capacity not being adequate, such as near natural drainages, springs, or wetlands. This permit authorizes discharges to the ground of concrete washout waste. iii. Stabilization Requirements The following requirements must be implemented for each site. (a) Temporary stabilization must be implemented for earth disturbing activities on any portion of the site where ground disturbing construction activity has permanently ceased, or temporarily ceased for more than 14 calendar days. Temporary stabilization methods may include, but are not limited to, tarps, soil tackifier, and hydroseed. The permittee may exceed the 14-day schedule when either the function of the specific area of the site requires it to remain disturbed, or, physical characteristics of the terrain and climate prevent stabilization. The SWMP must document the constraints necessitating the alternative schedule, provide the alternate stabilization schedule, and identify all locations where the alternative schedule is applicable on the site map. (b) Final stabilization must be implemented for all construction sites. Final stabilization is reached when all ground surface disturbing activities at the construction site are complete; and, for all areas of ground surface disturbing activities, either a uniform vegetative cover with an individual plant density of at least 70 percent of pre-disturbance levels is established, or equivalent permanent alternative stabilization methods are implemented. The division may approve alternative final stabilization criteria for specific operations. (c) Final stabilization must be designed and installed as a permanent feature. Final stabilization measures for obtaining a vegetative cover or alternative stabilization methods include, but are not limited to, the following as appropriate: (1) Seed mix selection and application methods; (2) Soil preparation and amendments; (3) Soil stabilization methods (e.g., crimped straw, hydro mulch or rolled erosion control products); (4) Appropriate sediment control measures as needed until final stabilization is achieved; (5) Permanent pavement, hardscape, xeriscape, stabilized driving surfaces; (6) Other alternative stabilization practices as applicable; Page 8 of 33