HomeMy WebLinkAboutEX10_RFA_Memo1
Brittany Gillia
From:Corey Thomas <cthomas@rentonrfa.org>
Sent:Wednesday, August 26, 2020 10:27 AM
To:Tom Barghausen; Alex Morganroth; Jonathan Chavez
Cc:Vanessa Normandin; Lisa Cavell; Barry Talkington; George Newman; Margi Fosdick; Ivana Halvorsen;
Jerry Pelland; David Knight
Subject:RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Tom,
This concept would be acceptable to the Renton Fire Authority, thanks.
Corey Thomas
Lead Plans Review Inspector
Renton Regional Fire Authority
425-276-9582
From: Tom Barghausen
Sent: Wednesday, August 26, 2020 10:18 AM
To: Alex Morganroth ; Jonathan Chavez ; Corey Thomas
Cc: Vanessa Normandin ; Lisa Cavell ; Barry Talkington ; George Newman ; Margi Fosdick ; Ivana Halvorsen ; Jerry Pelland
; David Knight
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Importance: High
Hi Alex,
We heard about the Cyber breach from Corey at the RFA who responded to the site plan confirming they had no issues
with it in regard to fire access so long as the porous pavement would support fire apparatus (which we assured him it
would).
We have another concept that we would like input on. See attached exhibit titled “Site Plan with 2-20’ wide Shared
Driveway JUD Tracts”. This site plan is similar to the markup you sent back to us on June 11, 2020 (also attached) where
you provided a sketch that contemplated two separate 20’ wide alleys on both the north and south property lines with
alley-load product and a central open space area. Each would serve 4 lots. Our plan provides a similar concept but relies
on permitted “shared driveways” per the RMC code section below in lieu of alleys.
In looking at the City of Renton road standards a private JUD/ tract road to serve up to 4 lots with a max length of 300’.
These tract roads are just over 200’ long. In lieu of a hammerhead we propose to install automatic fire sprinkler
systems in each home in order to satisfy the RFA.
The lots in this site plan are all over 7,000 SF. The lots abutting Aberdeen are 70’ wide and all other lots are at least 60’
wide. This site plan has no panhandles and each tract includes one lot that fronts on Aberdeen with the width equal to
or greater than the minimum required.
The only thing I haven’t accounted for is the 8’ wide landscape strip between the north shared driveway and the
property line. We can add this by making Lots 1 and 2 a depth of 117’. Both would still comply with the minimum 7,000
SF. However, we could also want to “flip” the north half of the site so that we have abutting shared driveways off of
Aberdeen similar to shared driveways on a new plat if the City would prefer that concept.
Please keep in mind that this site plan is a blue-beam sketch and we need to refine it in CAD but I think this can work
subject to the above. This concept would use porous pavement for the shared driveways to satisfy storm water
requirements.
What about this option?
Tom
J. SHARED DRIVEWAY STANDARDS:
EXHIBIT 10
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
2
1. Where Permitted: Shared driveways may
be allowed for access to four (4) or fewer
residential lots, provided:
a. At least one of the four (4) lots abuts
a public right-of-way and the street
frontage of the lot is equal to or greater
than the lot width requirement of the
zone;
b. The subject lots are not created by a
subdivision of ten (10) or more lots;
c. A public street is not anticipated by
the City of Renton to be necessary for
existing or future traffic and/or
pedestrian circulation through the short
subdivision or to serve adjacent
property;
d. The shared driveway would not
adversely affect future circulation to
neighboring properties;
e. The shared driveway is no more than
three hundred feet (300') in length; and
f. The shared driveway poses no safety
risk and provides sufficient access for
emergency vehicles and personnel.
2. Minimum Standards: Shared driveways
shall be within a tract; the width of the tract
and paved surface shall be a minimum of
sixteen feet (16'); the Fire Department may
require the tract and paved surface to be up
to twenty feet (20') wide. If a shared driveway
abuts properties that are not part of the
subdivision, an eight foot (8') wide landscaped
strip shall be provided between the shared
driveway and neighboring properties. The
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
3
landscape strip shall be within a tract and
planted with a mixture of trees, shrubs, and
groundcover, as required in RMC 4-4-070. The
shared driveway may be required to include a
turnaround per subsection H of this Section.
No sidewalks are required for shared
driveways; however, drainage improvements
pursuant to City Code are required (i.e.,
collection and treatment of stormwater), as
well as an approved pavement thickness. The
maximum grade for the shared driveway shall
not exceed fifteen percent (15%), except for
within approved hillside subdivisions. (Ord.
5841, 6-12-2017)
Thomas Barghausen, P.E. | President
Office: 425-251-6222 | Mobile: 206-954-7947
Barghausen Consulting Engineers, Inc.
18215 72nd Avenue South, Kent, WA 98032
www.barghausen.com
From: Alex Morganroth <AMorganroth@Rentonwa.gov>
Sent: Wednesday, August 26, 2020 9:27 AM
To: Tom Barghausen <tbarghausen@barghausen.com>; Jonathan Chavez <JChavez@Rentonwa.gov>;
cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jerry Pelland
<jerry@bluemtnfloors.com>; David Knight <davidrknight@landmaninc.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Hi Tom,
I apologize for the radio silence for the past week. The city had a major cyber security issue starting last week Tuesday
that continued until yesterday evening. The incident impacted every system we use and unfortunately we did not have a
way to communicate with folks.
I haven’t had time yet for a full evaluation of the plan, but after a quick glance, it looks you are proposing flag lots. The
only situation where we allow flag (or pipestem) lots is if there is no alternative available that would allow you to meet
the minimum density (see RMC 4-7-170.G). Since there are certainly designs available that would allow you to meet the
minimum density of the zone (4 du/ac), we would not support the use of flag lots.
The other issue I see is related to access. You may only use a private tract to access 4 lots or less. The road shown would
need to public and therefore the use of porous pavement would not be allowed.
Thank you,
Alex Morganroth, AICP - Senior Planner
City of Renton | CED | Planning Division
1055 S Grady Way | 6th Floor | Renton, WA 98057
(425) 430-7219 | amorganroth@rentonwa.gov
COVID-19 UPDATE
City Hall is currently closed to the public but we are still available to assist you.
· Pay Invoice and Apply for Over-the-Counter Permit: Permitting Portal
· Schedule an Inspection: Permitting Portal -OR- Building: 425-430-7202; Civil/Site: 425-430-7203
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
4
· Contact Staff:
o Staff Hours: Monday through Thursday 8 a.m. to 5 p.m. (Closed Fridays) between May 22, 2020 and July 24,
2020 to help respond to the economic challenges the City is facing from COVID-19
o Building or General Permitting: permittech@rentonwa.gov or 425-430-7200
o Planning: planningcustomerservice@rentonwa.gov or 425-430-7294
o Public Works Permitting: pwpermitting@rentonwa.gov or 206-402-8626
o Code Compliance: Renton Responds or 425-430-7373.
Please consider the environment before printing this email
From: Tom Barghausen <tbarghausen@barghausen.com>
Sent: Friday, August 21, 2020 3:10 PM
To: Alex Morganroth <AMorganroth@Rentonwa.gov>; Jonathan Chavez <JChavez@Rentonwa.gov>;
cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jerry Pelland
<jerry@bluemtnfloors.com>; David Knight <davidrknight@landmaninc.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Importance: High
Hello Alex and City of Renton team,
Pursuant to the pre-application follow up Zoom meeting on August 4th, I think we’ve found a way to design the
Vaughn/Williams Acre Short Plat to meet the standards necessary for the City to allow standard SFR homes (vs. Alley-
Load product) in the R-8 zone. Please see attached site plan dated 8-18-2020.
During our Zoom meeting we were told that so long as we designed the Lots to comply with the R-6 zoning standards we
could build standard front-load garage SFR homes. The R-6 zone requires larger minimum lot sizes (7,000 SF) and wider
widths (60’ on interior and 70’ on corners) along with other miscellaneous design requirements.
We believe the attached site plan complies with the R-6 design standards but will need you and the City staff to confirm
this looks reasonable and we haven’t missed anything significant. With these larger lot standards we were unable to
achieve the same 9-Lot yield but we think this can still work for our client and the Seller with only 8 Lots.
This site plan essentially maintains the same interior short dead-end street as we showed in the original concept with
two short “panhandle” lots 3 and 6.
Each lot is at least 7,000 SF and each lot is at least 60’ wide (interior) and 70’ wide on the 2 corner lots. Each of the
panhandles has the required 20’ width. Every other Lot meets the required minimum frontage on the road tract.
The success of this site plan is predicated on being able to use porous pavement for the tract road with full infiltration,
individual drywells for each Lot and bio-retention swales for the frontage improvements along Aberdeen Way. Our
geotechnical engineer confirmed that the site is underlain with highly permeable soils that have excellent infiltration
rates. With such soils we believe a low-impact design that incorporates the above means/methods of providing water
quality control and 100% infiltration is definitely feasible and would be the preferred option in Renton.
We are fairly certain that Renton may not allow porous pavement in public roads so we propose to make this road a
“private road tract” which is an allowed option. You will note that the design of the tract includes a bit of a “tee” shape
at the end in order to ensure Lots 4 and 5 each have at least 48’ of frontage (80% of the minimum lot width). We can
eliminate the “tee’s” by making the panhandles for 3 and 6 a bit longer if the city would support that. Either way we
think (hope) this works.
Can you please take a detailed look at this site plan and let us know if this is something the City can support? This is
going to be a desirable project that will complement the existing established homes in this neighborhood. We look
forward to hearing from you.
Thank you.
Tom
Thomas Barghausen, P.E. | President
Office: 425-251-6222 | Mobile: 206-954-7947
Barghausen Consulting Engineers, Inc.
18215 72nd Avenue South, Kent, WA 98032
www.barghausen.com
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
5
From: Alex Morganroth <AMorganroth@Rentonwa.gov>
Sent: Monday, June 15, 2020 4:55 PM
To: Tom Barghausen <tbarghausen@barghausen.com>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jonathan
Chavez <JChavez@Rentonwa.gov>; cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Hi Tom,
Not a problem. Feel free to reach out with any other questions.
Thanks,
Alex Morganroth, AICP - Senior Planner
City of Renton | CED | Planning Division
1055 S Grady Way | 6th Floor | Renton, WA 98057
(425) 430-7219 | amorganroth@rentonwa.gov
COVID-19 UPDATE
City Hall is currently closed to the public but we are still available to assist you.
· Pay Invoice and Apply for Over-the-Counter Permit: Permitting Portal
· Schedule an Inspection: Permitting Portal -OR- Building: 425-430-7202; Civil/Site: 425-430-7203
· Contact Staff:
o Staff Hours: Monday through Thursday 8 a.m. to 5 p.m. (Closed Fridays) between May 22, 2020 and July 24,
2020 to help respond to the economic challenges the City is facing from COVID-19
o Building or General Permitting: permittech@rentonwa.gov or 425-430-7200
o Planning: planningcustomerservice@rentonwa.gov or 425-430-7294
o Public Works Permitting: pwpermitting@rentonwa.gov or 206-402-8626
o Code Compliance: Renton Responds or 425-430-7373.
Please consider the environment before printing this email
From: Tom Barghausen <tbarghausen@barghausen.com>
Sent: Thursday, June 11, 2020 4:03 PM
To: Alex Morganroth <AMorganroth@Rentonwa.gov>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jonathan
Chavez <JChavez@Rentonwa.gov>; cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Thanks Alex. I misinterpreted the comment about alleys, thinking it was a preference vs. an absolute requirement,
especially since there aren’t any alleys in this neighborhood. Obviously it’s going to be very difficult to prove an alley
can’t work if financial considerations aren’t taken into account, or the specific types of homes that a builder feels are
appropriate for this particular area.
We will discuss this internally and let you know if we want to proceed further.
Thank you.
Tom
Thomas Barghausen, P.E. | President
Office: 425-251-6222 | Mobile: 206-954-7947
Barghausen Consulting Engineers, Inc.
18215 72nd Avenue South, Kent, WA 98032
www.barghausen.com
From: Alex Morganroth <AMorganroth@Rentonwa.gov>
Sent: Thursday, June 11, 2020 2:58 PM
To: Tom Barghausen <tbarghausen@barghausen.com>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jonathan
Chavez <JChavez@Rentonwa.gov>; cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
6
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Hi Tom – thanks for reaching out.
In order to make sure we’re all on the same page, I want to clarify that the alley-access requirement was explicitly
addressed in the preapp comments as well as verbally at the meeting.
From pg 10, paragraph 3 -
Access/Driveways/Parking: Access to the lots was proposed via a 45-foot wide limited access residential street off of Aberdeen Ave
NE.
Alley access is the preferred street pattern for all new residential development except in the Residential Low Density land use
designation (RC, R-1, and R-4 zones) and the R-6 zone. All new residential development in an area that has existing alleys shall utilize
alley access. New residential development in areas without existing alleys shall utilize alley access for interior lots. If the developer or
property owner demonstrates that alley access is not practical, the use of alleys may not be required.
The intent of the alley access requirement is to allow for rear-load designs, which reduce pedestrian/vehicular conflicts
and encourage a much higher quality home product. As noted in our code, we do have the ability to grant relief from the
alley access requirement if the applicant can provide justification related to site challenges (i.e. topography, fire access
issues, utility issues, size of the short plat, etc). A lack of interest in designing homes that can be rear-loaded is not an
acceptable justification and therefore relief from the alley requirement would not be supported by the City based on
only that information. If there are constraints other than home design that you believe preclude the ability to utilize
alleys on the site, I’d be happy to take a look.
Thank you,
Alex Morganroth, AICP - Senior Planner
City of Renton | CED | Planning Division
1055 S Grady Way | 6th Floor | Renton, WA 98057
(425) 430-7219 | amorganroth@rentonwa.gov
COVID-19 UPDATE
City Hall is currently closed to the public but we are still available to assist you.
· Pay Invoice and Apply for Over-the-Counter Permit: Permitting Portal
· Schedule an Inspection: Permitting Portal -OR- Building: 425-430-7202; Civil/Site: 425-430-7203
· Contact Staff:
o Staff Hours: Monday through Thursday 8 a.m. to 5 p.m. (Closed Fridays) between May 22, 2020 and July 24,
2020 to help respond to the economic challenges the City is facing from COVID-19
o Building or General Permitting: permittech@rentonwa.gov or 425-430-7200
o Planning: planningcustomerservice@rentonwa.gov or 425-430-7294
o Public Works Permitting: pwpermitting@rentonwa.gov or 206-402-8626
o Code Compliance: Renton Responds or 425-430-7373.
Please consider the environment before printing this email
From: Tom Barghausen <tbarghausen@barghausen.com>
Sent: Thursday, June 11, 2020 9:24 AM
To: Alex Morganroth <AMorganroth@Rentonwa.gov>; Ivana Halvorsen <ihalvorsen@barghausen.com>; Jonathan
Chavez <JChavez@Rentonwa.gov>; cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Barry Talkington <btalkington@barghausen.com>; George Newman <gnewman@barghausen.com>; Margi Fosdick
<mfosdick@barghausen.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Importance: High
Good morning Alex,
Thank you for your comments below but our client is not going to be building alley-load product on this site. It doesn’t
work for them and we need to maintain the 9 lot density based on the purchase price of the land as well as the cost of
development.
The previous site plan that the City did the pre-application review on had 10 lots which we knew was not going to work
based on Renton codes which is why we reduced it to 9 lots. The notes from that pre-application made no mention of
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
7
alley-load product being a requirement either. We also thought our site plan reflected the notes and comments from
the first pre-application meeting.
I understand the City may like to see more alley-load projects but If alley-load product is going to be a requirement for
this project then we won’t be moving forward with the application. If alley-load product is not a requirement then we
are hoping to get specific comments on the site plan we submitted along with the questions below from Ivana since we
are approaching the end of our feasibility period with the Seller so we are under a bit of a time constraint.
Thanks very much for your help here. I’ll let Ivana weigh in as well.
Tom
Thomas Barghausen, P.E. | President
Office: 425-251-6222 | Mobile: 206-954-7947
Barghausen Consulting Engineers, Inc.
18215 72nd Avenue South, Kent, WA 98032
www.barghausen.com
From: Alex Morganroth <AMorganroth@Rentonwa.gov>
Sent: Wednesday, June 10, 2020 5:02 PM
To: Ivana Halvorsen <ihalvorsen@barghausen.com>; Jonathan Chavez <JChavez@Rentonwa.gov>;
cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Tom Barghausen <tbarghausen@barghausen.com>; Barry Talkington <btalkington@barghausen.com>; George Newman
<gnewman@barghausen.com>; Margi Fosdick <mfosdick@barghausen.com>
Subject: RE: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Hi Ivana – thanks again for your patience on this one. After further discussion with Vanessa and some of our other
planners, I think this may be good site to provide alleys by getting a little creative with the design. I’ve attached one idea
that we had that incorporates alleys in order to rear load the homes, as well as a “open space” grass-crete area that may
be able to be used for the vault and fire turnaround. I would need to discuss this more with Corey, but I’ve seen similar
designs used on commercial projects and think it may be an option. I realize that this design may only allow for eight
lots, which is less than you had proposed. We may consider supporting a variance depending on the net density calcs.
We’re certainly open to considering other site designs, but I’d really like see incorporation of alleys explored more. Feel
free to reach out if you have any questions or would like to discuss over the phone. I should be much more available
now as I’ve finally gotten caught up on other projects, however we are currently furloughed on Fridays so it may take a
day or two longer than normal to respond.
As always, thanks for your patience on this.
Alex
Alex Morganroth, AICP - Senior Planner
City of Renton | CED | Planning Division
1055 S Grady Way | 6th Floor | Renton, WA 98057
(425) 430-7219 | amorganroth@rentonwa.gov
COVID-19 UPDATE
City Hall is currently closed to the public but we are still available to assist you.
· Pay Invoice and Apply for Over-the-Counter Permit: Permitting Portal
· Schedule an Inspection: Permitting Portal -OR- Building: 425-430-7202; Civil/Site: 425-430-7203
· Contact Staff:
o Staff Hours: Monday through Thursday 8 a.m. to 5 p.m. (Closed Fridays) between May 22, 2020 and July 24,
2020 to help respond to the economic challenges the City is facing from COVID-19
o Building or General Permitting: permittech@rentonwa.gov or 425-430-7200
o Planning: planningcustomerservice@rentonwa.gov or 425-430-7294
o Public Works Permitting: pwpermitting@rentonwa.gov or 206-402-8626
o Code Compliance: Renton Responds or 425-430-7373.
Please consider the environment before printing this email
From: Ivana Halvorsen <ihalvorsen@barghausen.com>
Sent: Thursday, May 21, 2020 10:14 AM
To: Alex Morganroth <AMorganroth@Rentonwa.gov>; Jonathan Chavez <JChavez@Rentonwa.gov>;
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
8
cthomas@rentonrfa.org
Cc: Vanessa Normandin <Vanessa.Normandin@mainvuehomes.com>; Lisa Cavell <Lisa.Cavell@mainvuehomes.com>;
Tom Barghausen <tbarghausen@barghausen.com>; Barry Talkington <btalkington@barghausen.com>; George Newman
<gnewman@barghausen.com>; Margi Fosdick <mfosdick@barghausen.com>
Subject: PRE20-00075 Vaughn Plat - questions for staff [BCE #21348]
Hi Alex et.al.,
We are looking into this property for which there has already been a preapplication meeting. We have redesigned the
project a bit to accommodate the needs of our client and per the comments from the preapp (see attached site plan).
Can you help get answers to a few questions that we have regarding this site? If we need a new preapplication meeting
we are happy to do that as well.
Zoning
· This area is not currently served by alleys and an alley will not be feasible for this site. Can you confirm that
alleys would not be required or clarify what is needed to demonstrate that alleys are not feasible when no alleys
exist?
· Density calculations are provided on the Site Plan.
Access
· There is not room on the site to accommodate an onsite cul-de-sac bulb and maintain the project density of 10
lots. The fire access comment allows for a hammerhead – can Transportation support use of a hammerhead for
this short road and the limited number of lots?
· We have redesigned to provide a 53’ wide public road segment with two 20’ wide private shared drives that
would provide a hammerhead turnaround and access for two lots each (Tract A serves Lots 3/4 and Tract B
serves 6/7 and the drainage facility).
o Can you confirm if this access scenario is acceptable to the city?
o Would the city prefer that the hammerhead legs be included in the public right-of-way instead of tracts?
· Aberdeen Ave NE will be improved per collector arterial standards with traffic calming per the neighborhood
greenway standard, as directed by the city.
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56
9
Stormwater
· We are investigating infiltration capacity for the site and anticipate an infiltration vault/chamber in Tract C, at
the southeast corner of the site.
· Based on the soils maps, the onsite soils may be suitable for infiltration. If infiltration is possible we would still
need an emergency overflow route. Can the emergency overflow route be directed west towards Aberdeen
Ave? See discussion below.
o If not, and an easement to the east is not available, can the infiltration facility be doubled in size in order
to eliminate the need for an overflow?
· Stormwater from the eastern half of Aberdeen Ave NE is collected by the storm system within the road and
routed in a southerly direction towards Sunset Blvd. Runoff from the project site flows in a southeasterly
direction, ultimately making the storm system in Blaine Ave NE our point of compliance for our onsite flows.
Stormwater within this system continues to flow in a southerly and easterly direction towards Sunset Blvd
before heading west and converging with the runoff from Aberdeen Ave NE approximately ¼ mile due south of
the project site.
· Are the two areas considered separate Threshold Discharge Basins because runoff from the two basins converge
at a point that is more than ¼ mile downstream if you follow the path through Blaine Ave. Or are they
considered the same Threshold Discharge Basin because they converge at a point less than ¼ mile as measured
directly south of the project site? See attached stormwater exhibit.
· Presumably the stormwater collected from the widening of Aberdeen Ave NE will be collected and routed to a
new drainage facility located within the development. This would include runoff from the existing portions of
the roadway. If the two basins are considered the same Threshold Discharge Basin, can we choose to discharge
all of our stormwater to the storm system in Aberdeen Ave or Blaine Ave? If the frontage and onsite areas are
considered separate Threshold Discharge Basins do we need to maintain existing basin areas that flow south
along Aberdeen Ave or can all of the stormwater be directed to the onsite drainage facility? If we combine the
runoff into a single drainage facility would we be required to over detain for the portion from the existing road?
Hopefully you can get answers to these questions and get back to me. If you would like to schedule a phone call or
virtual meeting I am happy to do that as well.
Thank you.
Ivana Halvorsen | Senior Planner
Office: 425-251-6222 | Mobile: 206-255-4793
Barghausen Consulting Engineers, Inc.
18215 72nd Avenue South, Kent, WA 98032
www.barghausen.com
DocuSign Envelope ID: 112E161D-80DF-4685-9512-FD7A57D17E56