Truckee Municipal Code Ch. 11.04 Requirements for Construction, Development, and Redevelopment Activities

A. Demonstration of Outside Agency Permitting and Town Development Code Compliance

1. Prior to, and as a condition of, receiving a grading or building permit, the person who possesses the title of the land or the leasehold interest on which a construction activity will occur within the Town shall demonstrate that the project is covered under applicable permits, including, but not limited to: the State Water Board's Construction General Permit; Industrial General Permit; State Water Board 401 Water Quality Certification; United States Army Corps 404 Permit; and California Department of Fish and Game 1600 Agreement. The Town may require documentation demonstrating coverage by and compliance with any applicable permit, including copies of any notice of intent, Stormwater Pollution Prevention Plans, inspection reports, monitoring results, and other information deemed necessary to assess compliance with this chapter or any permit.

2. Any person performing construction work within the Town disturbing soil or rock shall demonstrate compliance with the Town of Truckee Development Code and implement appropriate BMPs to prevent the discharge from the site of soil, construction wastes, or debris, including contaminants from construction materials, tools, and equipment to the stormwater drainage system or Waters of the State. Such terms, conditions, and requirements may include, but are not limited to, requirements consistent with CASQA's Construction, New and Redevelopment, and Industrial/Commercial Best Management Practice Manuals, and requirements for erosion and sediment controls, soil stabilization, dewatering, source controls, pollution prevention measures and illicit discharges.

B. Wet Season and Emergency Site Stabilization

1. All sites shall be stabilized, year round, with specific BMPs to control erosion and protect water quality 48 hours prior to a wet weather event or as requested by the Director/Engineer. The applicability of any other exemption to a ground disturbance shall not be deemed permission to violate any provision of this title.

2. All soil-disturbing activities shall cease when wet weather conditions exist, unless it is deemed an emergency or otherwise exempt. Adequate temporary erosion control measures shall be installed prior to a wet weather event.

3. The responsible party shall field check temporary BMPs prior to storm events, immediately after storm events, during storm events longer than 48 hours, and weekly. All maintenance, repairs, and needed BMP changes shall be completed in a timely manner. BMPs shall be inspected every 24 hours during extended storm events.

4. Winterization of sites shall be made prior to the wet season. Permanent or temporary stabilization of all disturbed or eroding areas shall be installed consistent with the requirements of this Chapter. Installation and maintenance of BMPs is required on a year-round basis. All BMPs shall be inspected for winterization and proper function prior to October 15.

5. Ground disturbance that falls subject to the Town's grading requirements, including vegetation removal that disturbs soil, shall be prohibited during the wet season (Town of Truckee Municipal Code 15.03.160), unless a variance is approved as outlined below.

a. Where it can be shown that granting a variance would not cause or contribute to the degradation of water quality, an exception to the wet season grading prohibition may be granted in writing by the Town's Community Development Director, or designee, for areas outside of the Town's right-of-way or the Town Engineer, or designee, for areas within the Town's right-of-way.

b. A project that may be granted a "wet season variance" shall have a low erosivity factor and possess a minimal opportunity for sediment transport off the project site. Wet season variance is evaluated by, but not limited to, the following general criteria: slope (relatively flat sites less than 10%), proximity to a waterbody or watercourse (greater than 250 ft.), area of disturbance (less than 10,000 sq. ft.), minimal opportunity for sediment to leave the project site, and 10-day weather forecast.

c. Variances requested by commercial projects shall be for a set 10-day period or less with a renewal possible given the scope of the work and weather forecast.

C. Temporary Construction Site Measures

1. Adequate temporary erosion control measures shall remain in place until all disturbed areas are permanently stabilized and/or vegetated and after all permanent erosion control is properly placed. Temporary measures must be removed and properly disposed of after all construction has been completed and the site has been stabilized.

2. All projects shall prevent fugitive dust during and after construction with the use of water or by covering disturbed areas with mulch, tackifier, vegetation, or an approved equivalent.

3. All loose piles of soil shall be protected during periods of precipitation or runoff by a combination of the following:

a. Stockpiles situated in appropriate locations to reduce wind and water impacts.

b. Installation of erosion control measures such as silt fences and waddles.

c. Application of tackifier products.

d. The use of tarps temporarily during the building season (May 1 — October 15) or in an emergency capacity.

4. Spills and leaks of materials shall be prevented. Trash enclosures/storage containers and portable toilets shall be properly stored and maintained. These items are not permitted within the Town Right-of-Way unless specifically approved by the Town.

5. All surplus materials shall be removed from the site and deposited in an approved location within 10 days from completion of construction.

A. For all projects, volumetric and flow-based criteria for permanent BMPs are found in the most recent MS4 permit and in the Town of Truckee's LID Calculator.

B. For projects that create and/or replace (1) one acre or more of impervious surface and that increase impervious surface area over the pre-project condition, the post-project runoff shall not exceed the estimated pre-project flow rate for the 2-year, 24-hour design storm.

A. A preliminary SWQP that includes permanent BMP locations and sizing shall be submitted as part of an application for a land use permit, for new development, and redevelopment (as that term is used in Section E.12.c (ii) of the 2013 MS4 Permit or the corresponding section of the most recent MS4 permit).

B. A final SWQP shall be submitted as part of the application for a Building Permit.

1. Projects that require grading over 500 square feet or 20 cubic yards up to one (1) acre of new impervious surface shall be designed to retain, infiltrate, and/or detain stormwater runoff from the design storm, at a minimum, using the numeric sizing criteria described in Section 11.04.020. The Town may require a design to accommodate a larger storm event when topographic and/or drainage conditions of the surrounding area or watershed warrant more stringent drainage improvements.

2. Redevelopment projects (as the term is used in Section E.12.c (ii) of the 2013 MS4 Permit or the corresponding section of the most recent MS4 permit) that increase the impervious area by more than 50 percent of the previously existing development must retain and infiltrate the appropriate design storm as described in section 11.04.020 from the entire project, consisting of all existing, new, and/or replaced impervious surfaces.

3. Redevelopment projects (as the term is used in Section E.12.c (ii) of the 2013 MS4 Permit or the corresponding section of the most recent MS4 permit) that do not result in an increase of impervious surface by more than 50 percent of existing development need only to retain and infiltrate the design storm, using the numeric sizing criteria described in section 11.04.020 for the new and/or replaced impervious surface.

4. Roadway and Linear Utility Projects (LUPs) that create 5,000 square feet of contiguous impervious surface shall be designed to retain, infiltrate, and/or detain stormwater runoff, at a minimum, from the design storm event, using the numeric sizing criteria described in section 11.04.020. The following projects shall comply with the requirements found in (b) of this section: new streets or roads, sidewalks and bicycle lanes, widening of existing streets or roads with additional traffic lanes, construction of linear underground/overhead projects (with a discrete location over 5,000 square feet), and impervious trails. Exceptions may be made for some projects in accordance with the MS4 permit.

5. Projects with soil disturbance of (1) one acre or more require a Construction General Permit and shall submit a copy of the SWPPP plan that was included in the submission to the State Water Resources Control Board as the final SWQP.

C. The Town may approve the submittal in compliance with this Chapter, or may deny or require changes to a submittal that is not in compliance.

SWQP requirements shall include the following components and shall be consistent with the current MS4 permit, the "California Stormwater Best Management Practices Handbooks" prepared by the California Stormwater Quality Association, and the guidance given in the Town of Truckee's Public Improvement and Engineering Standards, the Town of Truckee's Development Code, and the Town of Truckee's LID Calculator. The SWQP shall include:

A. Site Assessment narrative, as defined in the Town's LID Calculator and current MS4 permit.

B. Locations and aerial extent of permanent post-construction BMPs, sized according to section 11.04.020, and labeled with corresponding drainage management areas.

C. Permanent post-construction BMP maintenance plan for all permanent BMPs (O & M Plan) as directed by the Town.

D. Location of drainage infrastructure and delineation of flow paths utilized to direct stormwater runoff to post-construction measures (features may be included in the required drainage report).

1. The structural and hydraulic adequacy of all stormwater conveyance facilities shown on the SWQP shall be verified by a licensed professional and all calculations and supporting material to demonstrate such adequacy shall accompany the plans as required by the Town's Engineer as set forth in the Town's Public Improvement and Engineering Standards, section 5 Drainage.

E. Erosion and Sediment Control Plan (ESCP)

1. Location (plan view) of BMPs and type of temporary erosion and sediment control measures including the location of a non-pervious concrete washout area or expressed prohibition of concrete washout on site; and

2. A clear delineation of effective temporary erosion control barriers and a section view showing their correct installation for all areas of disturbance. Shall be consistent with the erosion control plans requirements found in the Town of Truckee's Development Code.

F. Schedule of project operations including general dates and scope of work involved in the construction activity.

G. Commercial, Industrial, Mixed Use and High Density Residential (greater than 10 units per acre) development or significant redevelopment must comply with the Town of Truckee's trash capture policy and the Trash Amendments.