Contents of a construction stormwater pollution prevention plan shall be consistent with the requirements and examples cited in this chapter, the manual, NPDES Phase II permit Appendix 1, and Chapters 2 and 5 of the Sumner Development Specifications and Standard Details including required written descriptions and calculations. Erosion and sediment control BMPs shall be designed/prepared and stamped by a civil engineer licensed to practice in the state of Washington. The required contents of geotechnical engineering reports shall be established on a project-by-project basis.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011)
A. 
TESC approval will remain in effect through the duration of the permit it is associated with or until, per the discretion of the city engineer or his or her designee, modification is necessary. Permit extension shall be required if the project is not completed within the time limit specified on the permit. Applicant shall be required to pay permit fees associated with TESC approval as specified in chapter 15.74 SMC prior to the city issuing a permit extension.
B. 
If a permit extension is granted by the city, the permittee shall implement any additional TESC measures as required by the city as part of the conditions for granting the time extension.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011)
Modifications to the provisions of an approved permit requiring TESC approval must be submitted to the city and reviewed by the city engineer or his or her designee for compliance with this chapter. Substantial modifications, as determined by the city engineer or his or her designee, shall require additional permit fees and modification of the approved permit. Minor modifications can be approved by a letter of modification from the city engineer or his or her designee.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011)
Approved permits shall be prominently displayed on the subject property at all times during the construction or other activity until completion of the construction or other activity, and the final inspection by the city engineer or his or her designee has taken place.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011)
Prior to approval of all city permits requiring TESC approval, and as a condition of the permit approval, the applicant shall post and maintain an erosion and sediment control bond or an assignment of funds in lieu of bond. The erosion and sediment control bond shall be effective throughout the duration of the project and final project site stabilization, as determined by the city engineer or his or her designee, and shall be released after the completion of the final inspection and project approval by the city engineer or his or her designee. The erosion and sediment control bond shall provide sufficient funds to pay for damages due to design defects and/or failures in workmanship of sedimentation ponds or construction drainage BMPs and to guarantee repair of damages resulting from failure to provide adequate erosion and sediment controls. The bond shall be at least equal to 100 percent of the total estimated construction cost of implementing the construction stormwater pollution prevention plan or $15,000, whichever is greater.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011)
A. 
At a minimum, land-disturbing activities regulated by and defined in this chapter shall comply with the standards and criteria contained in Volumes I, II, and III of the manual, the provisions contained in this chapter, the NPDES Phase II permit, and Sumner Development Specifications and Standard Details. When standards are in conflict, the most stringent provisions shall apply.
B. 
TESC stormwater management facilities shall be selected, designed, constructed, operated, and maintained in accordance with the standards adopted in SMC § 13.48.030.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.451)
In addition to the manual standards and NPDES Phase II permit requirements, all clearing activities regulated by and defined in this chapter shall conform to the following standards:
A. 
The project shall be designed to minimize clearing.
B. 
All clearing limits shall be delineated and clearly flagged in the field prior to the commencement of any clearing or other construction.
C. 
From October 1st through April 30th, additional erosion and sediment control measures shall be implemented in accordance with the manual or as directed by the city engineer or his or her designee. Wet season erosion and sediment control measures shall be shown on the plans for projects regulated under this chapter that include construction activities between October 1st and April 30th.
D. 
Erosion and sediment controls consistent with the manual shall be used on the subject property and shall be installed prior to the commencement of any clearing, grading, or other construction.
E. 
The subject property shall be limited to one construction entrance for clearing and grading operations, if possible, which shall be protected to prevent severe disturbance of soils around the entrance and to prevent sediment transport onto paved surfaces.
F. 
Temporary erosion and sediment controls shall be maintained by the applicant so that design performance is ensured throughout the duration of construction.
G. 
Permanent erosion and sediment controls must be established and be in operation as designed within 30 days of the completion of construction.
H. 
Temporary erosion and sediment controls shall be removed from the subject property within 30 days after permanent stabilization is achieved.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.452)
In addition to the clearing requirements of SMC § 13.48.460 and the minimum requirements of SMC § 13.48.450, grading activities regulated by this chapter shall conform to the following standards:
A. 
The project shall be designed to minimize changes in grade, cleared areas, and volumes of excavation or fill.
B. 
The maximum gradient on any artificial slope shall be two feet of horizontal run to one foot of vertical fall and shall be constructed so that erosion is minimized.
C. 
The applicant shall at all times protect adjacent private properties and public rights-of-way or easements from damage during grading operations. The applicant shall restore public and private property damaged by the project operations to conditions existing at the time of the issuance of the permit.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.453)
All clearing and grading activities in addition to the requirements of SMC § 13.48.460 and § 13.48.470 shall make provisions for drainage during construction pursuant to the following requirements and those set forth in the manual and the NPDES Phase II permit:
A. 
Drainage facilities for the conveyance of runoff during construction shall be designed to discharge runoff in a natural and safe location.
B. 
Downstream properties shall be protected from erosion and flooding due to increases in volumes or rates of runoff due to the activities on the subject property. Conveyance structures, sedimentation basins, traps, and temporary flow control BMPs shall be designed and constructed in accordance with the manual and the NPDES Phase II permit requirements.
C. 
All runoff from the subject property shall pass through sediment control BMPs as detailed in the manual before leaving the subject property. The applicant shall be responsible for preventing erosion and discharge of sediment and other pollutants into receiving waters.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.454)
If greater than 50 cubic yards of any material defined in subsection A of this section is used in any of the activities defined in subsection B of this section, then erosion and sediment controls shall be required. This standard is applicable to both existing and proposed activities with the usages defined in subsection B of this section, regardless of having to obtain permits or approvals under this chapter. The applicable materials and activities are:
A. 
Material: topsoil, crushed rock, gravel, saw dust, mulch, bark, wood chips, or similar materials.
B. 
Activity: stockpiling, open storage, broadcasting, or spreading of the materials defined in subsection A of this section.
The amount and type of erosion and sediment controls for these usages shall be approved by the city engineer or his or her designee on an individual basis. At a minimum, these usages shall have properly installed and maintained silt fences or similar protection BMPs around the perimeter of the activity, materials to cover or otherwise stabilize exposed stockpiles, and extra materials/BMPs for wet season application.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.455)
The city engineer or his or her designee may require erosion and sediment controls in addition to those specifically stated in this chapter or in the manual if, in the judgment of the city engineer or his or her designee, the existing temporary or permanent controls are not sufficiently minimizing erosion and sedimentation of waterways.
(Ord. 2316 § 1 (part), 2010; Ord. 2356 § 11 (part), 2011; Formerly 13.48.456)