HomeMy WebLinkAboutL_ExhibitBDrainageMaint_180326_V2
EXHIBIT B
Perforated pipe connection as required
PR13000037
B17005932
V2
REVISION Received: 04/06/2018 / aalexander
BUILDING DIVISION
APPROVEDBUILDING DIVISION
THIS SET OF APPROVED PLANS MUST BE ON THE JOB AT ALLTIMES DURING CONSTRUCTION. THIS BUILDING IS NOT TO BEOCCUPIED UNTIL AFTER FINAL INSPECTION BY THE RENTONBUILDING DIVISION AND RECEIPT OF CERTIFICATE OFOCCUPANCY.
APPROVAL SHALL NOT BE CONSTRUED AS THE AUTHORITY TOVIOLATE OR CANCEL ANY PROVISIONS OF CODES, ORDINANCES,OR OTHER REGULATIONS ENFORCED BY THIS CITY.
DATE: 04/19/2018
FLOW CONTROL MAINTENANCE INSTRUCTIONS
Site Address
16006 SE 140th Street Renton WA 98059
Mindy’s Place (Estates) lot 2
Parcel # 554754-0020
The Development Conditions of Mindy’s Place plat requires a Reduced Impervious Surface credit
BMP of a maximum of 3,564 square feet for this lot. This lot 6 House, porch, patio and driveway
cover approximately 3,480 ft. at no time can the impervious surfaces be increased to more than the
maximum of 3,564 sq. ft. The square footage of any sheds, additional patios or building additions
cannot cover more than the remaining 84 square feet.
This property contains a storm water management flow control BMP (Best Management Practice)
called a "perforated pipe connection," which was installed to reduce the storm water runoff
impacts of some or all of the impervious surface on your property.
A perforated pipe connection is a length of drainage conveyance pipe with holes in the bottom,
designed to "leak" runoff, conveyed by the pipe, into a gravel filled trench where it can be soaked
into the surrounding soil. The connection is intended to provide opportunity for infiltration of any
runoff that is being conveyed from an impervious surface (usually a roof) to the local drainage
system designed for the plat Per King County 2009 SWDM Appendix C.2.11 see attached drawing.
Infiltration devices must be inspected annually and after major storm events to identify and repair
any physical defects. Maintenance and operation of the system should focus on ensuring the
system's viability by preventing sediment-laden flows from entering the device. Excessive
sedimentation will result in a plugged or non-functioning facility. If the infiltration device has a
catch basin, sediment accumulation must be removed on a yearly basis or more frequently if
necessary. Prolonged ponding around or atop a device may indicate a plugged facility. If the device
becomes plugged, it must be replaced. Keeping the areas that drain to infiltration devices well
swept and clean will enhance the longevity of these devices. For roofs, frequent cleaning of gutters
will reduce sediment loads to these devices. Minimum