Mitigated Determination Of Non-Significance

Project Name: Sedron Services

Permit Application No: PLN-2019-0108

Location: 2518 East Valley Hwy, Sumner, WA (Parcel(s) # 0520073012 and 0520073014)

Description of Proposal:  Sedron Technologies, LLC is proposing to renovate and occupy a previously developed 3.07-acre site currently used by A Advanced Septic.  The site contains and is adjacent to wetlands and a type 3 stream.  The applicant proposes to demolish the existing structures and reconstruct an approximately 9,600 square foot building to intake septic waste for processing into a class A EQ bio-solid for reuse and aqueous ammonia for agricultural use.  The project will include 8 – 37,500-gallon storage tanks located outside critical area buffers for in feeding septic waste, one approximately 8,000 gallon tank for ammonia and spill containment systems for all tank areas.  The project does not propose any expansion beyond the existing developed foot print and will include the following: a 11,790 square foot reduction of impervious surface within buffers, 4,620 square feet of wetland and stream enhancement, 3,210 square feet of stream and wetland buffer enhancement, a 2,500 square foot bioswale with native vegetation, curbing of the existing pavement to improve stormwater treatment and increase spill containment, buffer fencing with wetland signage, removal of invasive species, ornamental landscaping, restriping of existing parking stalls, utility work and storm water management.


Dan Balmelli

Barghausen Consulting Engineers

18215-72nd Ave South

Kent, WA 98032

Lead Agency: City of Sumner

The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment.  An environmental impact statement (EIS) is not required under RCW 43.21C.030 (2)(c).  This decision was made after review of a completed environmental checklist and other information on file with the lead agency.  This information is available to the public on request.

Associated Documents:

This DNS is issued under 197-11-340 (2); the lead agency will not act on this proposal for 14 days from the publish date below.

Responsible Official:    Ryan Windish  

Position/Title:  Community Development Director

Address: 1104 Maple Street Suite 250, Sumner, WA 98390         

Phone: (253) 299- 5524

Questions or comments: Scott Waller, Associate Planner:


  1. Any open-air sewage treatment facilities such as the bioswale shown must be lined with an impervious membrane or other suitable barrier to prevent any possible contamination of the groundwater.  
  1. This project must extend the public sewer within East Valley Highway to the southern limits of this parcel’s frontage. The extension must be 12” diameter and at minimum slope for maximum utility, and comply with all other City infrastructure requirements.
  1. This project triggers full frontage improvements but East Valley Highway in this location does not need to be upgraded with curb, gutter, or sidewalk as part of this project. The roadway is mostly compliant with the current standards. Street illumination must be upgraded along this project’s frontage to meet minimum standards as described in the City of Sumner Development Specifications and Standard Details.
  1. This project will be subject to an Industrial Sewage Discharge Agreement with the City and shall install a sampling manhole as required by Sumner Municipal Code.
  • Odor – In order to ensure this project will comply with SMC 18.18.060 (I), an odor control and response protocol shall be submitted to the City prior to the approval of any Building permit.  The odor control and response protocol shall address to the satisfaction of the City: frequency and methods of odor testing, response in the event an odor complaint is received, comprehensive odor study to assess the operation and options for implementing corrective measures if needed.  Prior to final approval by the City, the odor control and response protocol shall be sent to parties of record with a 10-day comment period.  Nothing contained herein is intended to limit the City’s enforcement options or remedies available to address odor issues or violations.
  • A copy of Sedron’s approved PSCAA Air Quality permit shall be submitted to the City prior to issuance of building permits.
  • Noise – noise levels shall comply with those listed in SMC 8.14 and sound attenuating materials shall be installed as needed around all sound generating equipment such that they do not exceed allowable levels.
  • Lighting – all lighting shall be directed away from wetlands and stream and down shielded to prevent light pollution onto neighboring properties and or the ROW.
  • Spill containment – a spill protection plan shall be reviewed and approved by the City prior to approval of any Building permit.
  • Truck queuing – trucks shall not queue or park in such a way that they extend into ROW.
  • Stored biosolid materials shall be in an enclosed container, no outdoor open-air stockpiling is allowed.
  • Submit a hydrogeologic assessment for review by the City and Tacoma Pierce County Health Department per SMC 16.48.090.  No building permit shall be issued until the assessment can demonstrate to the satisfaction of the City and TPCHD that this project will not create adverse impacts or that adverse impacts can be appropriately mitigated.
  • Wetlands and the property’s mitigated portion of the wetland and stream buffers need to be permanently protected in an easement or dedicated tract per HMP section 7.12, SMC 16.56.100(C) and SMC 16.46.190 (A), and an easement for ingress/egress provided by the property owner that grants the City access to these buffer areas for future maintenance, conservation and restoration measures.
  • Mitigation and monitoring shall be implemented per approved HMP prior to or concurrent with site development and consistent with SMC 16.46.
  • Prior to building permit issuance, the property shall be required to have recorded title notifications of the following hazard areas, on forms provided by the City:
    1. Wetland protection area
    2. Aquifer recharge area
    3. Seismic hazard area
    4. Volcanic hazard area
  • A Boundary line adjustment or lot consolidation shall be completed to ensure new construction meets development standards.