Magic Toyota Curb Ramp-email and attach.pdfFrom: McConnell, Jeanie
To: "John Hanson"
Subject: RE: Magic Toyota; 212th & Hwy 99 Curb Ramp
Date: Friday, February 2, 2018 10:47:28 AM
Attachments: Magic Toyota Curb Ramp.pdf
Hi John,
I reviewed the curb ramp plan you provided with my manager, Rob English, and the City's
transportation engineer, Bertrand Hauss. I have marked -up the attached plan to show the
requirements that will need to be met. The revisions include the following:
1) Replacement of the ramp landing to install truncated domes. Matching running slope of the
street is acceptable.
2) 212th Street curb ramp wing will need to be removed and replaced to meet 8.3% max slope
and/or 15-feet.
The signal/electrical boxes are not affected by the revisions required. Please let me know if you have
any questions.
Thank you!
Jeanie
From: John Hanson [mailto:jhanson@navixeng.com]
Sent: Tuesday, January 23, 2018 10:56 AM
To: McConnell, Jeanie<Jeanie.McConnell @edmondswa.gov>
Subject: Magic Toyota; 212th & Hwy 99 Curb Ramp
Hi Jeanie,
We finally got out to take some measurements on the curb ramp at 212th and Hwy 99 (see the
attached PDF for field notes).
My thoughts on the condition are as follows:
• The cross slope toward the street is under 2% in all cases, so that is not an issue.
• The slope along the sidewalk through the curb ramp landing is 4%-5%, this slope is driven by
the slope of the gutter line through the curb return. Unless the entire quadrant of the
intersection is demolished and regraded, this slope will be hard to change without creating
some irregular transitions between the gutter and the crosswalks.
• The slope in the 212th side curb ramp is 9.8% - 9.9%. While this is steeper than the typical
12:1 for new construction, the exception in ADA Standards Section 405.2 allows limited ramps
between 12:1 and 10:1 for Existing Sites, Buildings and Facilities. This is a short existing ramp
in that range.
• The slope at the top of the curb ramp is 3.7% - 4.1%. Again, this slope is driven by the slope of
the gutter, so it would be a major undertaking to adjust this grade.
The only feasible improvement (without a major intersection improvement project) would be to
extend the ramp back one additional concrete panel for a 13' curb ramp. Considering the notes
above, the work that would be required around the existing utility boxes and the construction
impacts to pedestrian circulation for the work, it doesn't seem necessary.
Please let me know when you have a couple minutes to discuss.
Thanks,
John Hanson, P.E.
Navix Engineering
11400 SE 8th Street, Suite 345, Bellevue WA 98004
o: 425.453.9501 1 d: 425.458.7903 1 f: 425.453.8208
Ohanson _ navixeng.com I www.linkedin.com/in/John-hanson-a423abl28
www.navixena.com
Professional Engineer— WA, WY, NC, VA
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