12-inch minimum diameter, larger if drainage requires, as directed by the County Engineer - County Road Standards, Drawing 508.D-1.
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The Engineering Division administers the Whatcom County Development Standards. Please refer to Chapter 5 - Road Standards.
Private residential driveways (1 and 2 residential units) outside of county rights-of-way are typically reviewed by the Fire Marshal in Planning and Development Services at 360-778-5900.
It’s a paved approach to an intersecting county road extending from the property line or a driveway approach abutting a paved public road. For details see Drawing 508.D-4, 505.E-3, 505.E-4 of the Road Standards - Chapter 5.
That will be determined by the Right-of-way Inspector after you have applied for a Revocable Encroachment Permit.
Other federal, state and local permits may be needed. Check with the local jurisdictions/districts for water and sanitary sewer hookup information. A good resource for checking what federal or state permits you may need for your development is a handbook titled “Commonly Required Environmental Permits for Washington State.”
Development Standards - Chapter 2 - Stormwater Management requires as a minimum that a Preliminary Stormwater Proposal be submitted. The Proposal is intended to provide the county with a general overview as related to a proposed project. The information will be used to determine which regulations apply and whether to require a more detailed Stormwater Design Report.