EXH2061031718

RE: Response to your e-mails of February 1 and February. 5.2001 Page 1 of 3 Kenny, Ann From: LaVassar, Jerald Sent: Monday, February 26, 2001 9:29 AM To: Kenny, Ann Subject: RE: Response to your e-mails of February 1 and February 5, 2001 Dear Ms. Kenny: As I stated in my voice mail, I am confused as to how the MSE wall can be construed to be a dam I remember no pool situated immediately behind the MSE wall. At most there is a drainage ditch paralleling the wall that is designed to conduct any runoff from the runway areas to the distant storm water management facilities. As I mentioned in our phone call last week, if one allowed water to build up behind the wall, the lateral loads on the wall system would roughly double. In fact. one of the design criteria for selecting the wall backfill immediately behind the facing panels is to assure these select soils are free draining to preclude the backfill from ever becoming saturated! The following language is included in WAC 173-175-020 as to the what constitutes a dam under our purview. Specifically, "These regulations are applicable to dams which can impound 10 acre-feet or more of waster as measured at the dam crest elevation. The 10 acre-feet threshold applies to dam which can impound water on either an intermittent or permanent basis: Only water that can be stored above natural ground level and which could be released by a failure of the dam…

Open full document

Upcoming Events

PSCAA Advisory Council Meeting Agenda
Add to CalendarMWednesday Mar 11, 9:00am - 11:35am
1904 3rd Avenue, Suite 105, Seattle, WA 98101
Call to order – Roll Call – Quorum Established – Land Acknowledgement We would like to acknowledge that our Agency operates in four present-day counties, which are the traditional lands of the Coast Salish people, past and present. This acknowledgement does not take the place of authentic relationships with indigenous communities in our jurisdiction and [...]