2013 Water System Plan, Volume II - Seattle City Clerk's Office - City ...

Table 18-2 Information Included in the Preliminary Assessment Tool (PAT)
Utility
Information to be provided in the Preliminary Assessment Tool
Water
Drainage and
Wastewater
(D/WW)
The WAC is automatically triggered in PAT.
Verify the following information input by DPD Site Team
- Locations of existing public infrastructure (sanitary sewer, storm sewer or
combined) and pipe sizes
- Preliminary drainage control requirements including flow control, WQ
treatment and/or green stormwater infrastructure (GSI) if required
- Preliminary drainage water quality treatment requirements if required
Waive or Concur with the following DPD-identified requirements:
- If drainage or sewer main extension is required
- If a build-over process is required
Other additional areas of investigation:
- If more than one possible connection point, the reviewer may suggest
preferred pipe and location of connection
- Potential capacity issues
18.4.4.2 Preliminary Assessment Performance Measures
The SPU service level agreement is to complete the Preliminary Assessment review within 48
hours of receipt from SDOT. If route backs are required, then an additional 48 hour window is
allowed once the project enters SPU’s queue a second time.
18.4.5 Water Plan Review
SPU reviews Water Utility plans as part of four related processes:
Water Availability Certificate (WAC)--The Water Availability Certificate (WAC) is
the most common process by which SPU confirms there is adequate domestic
water flow and pressure for a new development. The developer may be
required to pay SPU to perform hydrant flow tests and/or system model
calibration in order to assure the water system can serve the project and
surrounding area.
Water Availability Inquiry (WAI)—Similar to a WAC, but is not related to a
specific project.
Water Availability Approval (WAA)--The Water Availability Approval (WAA)
allows a developer to obtain a Building Permit for new development without
obtaining a WAC from SPU. SPU has a MOA with DPD that allows DPD to issue
the WAA in lieu of a WAC for certain smaller projects that will not require
increased water services.
Detailed Water Infrastructure and Water Service Plan Review.
18.4.5.1 Water Availability Certificate (WAC)
The Water Availability Certificate (WAC) is the most common process by which SPU confirms
there is adequate domestic water flow and pressure for a new development. The WAC reviewer
performs analysis and applies SPU water policy in determining the need for any water system
improvements. The WAC reviewer estimates fire flow in determining requirements, but this is
18-10
SPU Design Standards and Guidelines