Gibson Traffic Comment Response Memo 20190715_Resub (2).pdfCOMMENT RESPONSE
To: Bertrand Hauss, Transportation Engineer — City of Edmonds
From: Matthew Palmer, PE %tv
Subject: Comment Response
Project: 22810 Edmonds Way, City of Edmonds No. PLN20190003, GTC #19-071
Date: July 12, 2019
This response memorandum is to provide additional information to address the comments in the Letter
of Completeness and Request of Additional Information dated May 30, 2019.
The City comment was provided in bold with the responses to follow.
• Provide confirmation that Gibson Traffic Consultants prepared the TIA based on
the current proposal. The Site plan included in the packet does not include reconfiguration
of the ingress/egress lanes at SR-104.
The latest layout is included in the attachments. The plan doesn't change the analysis as there is
still a single outbound lane and Synchro doesn't account for two receiving lanes. The advantage of
the second receiving lane is in case an inbound vehicle is blocked by an outgoing vehicle.
• Under the Project Description it is noted that the existing c-curbing will be
removed; however, a c-curb will still be required although the configuration will be
modified over the existing condition. Please revise.
The c-curbing is included in the updated layout and extends for approximately 20 feet.
Revise the report to include signal detection requirements — verification of existing
placement/requirement to relocate.
Verification of existing signal detection is addressed by others. From the level of service analysis,
the northbound 95th percentile queue with the development is less than 20 feet. With a future
volume of 15 vehicles from the signal entering the apartment complex/development the demand of
1 vehicle every 4 minutes would note queue back to SR-104 with the outbound queue being less
than 20 feet not blocking the ingress.
• Revise the report to address turning movements. Upon entering the access easement
area off SR-104, the east ingress lane should be striped to indicate left turns only
into the proposed development. In addition, when exiting the proposed
development turning movements should be limited to a right -turn only into the
access easement area.
The updated layout shows the striping from the c-curbing into the proposed development.
2813 Rockefeller Avenue - Suite B - Everett, WA 98201
Tel: 425-339-8266 - Fax: 425-258-2922 - E-mail: info@gibsontraffic.com
22810 Edmonds Way
Comment Response
• Address sight distance coming out of the proposed development driveway assuming
there are vehicles in the parking lot.
The development access to the private parking lot/private roadway was looked at for possible sight
distance obstructions. Per the latest layout the parking along the east property line that would
obstruct the sight distance for an exiting vehicle has been removed. Per a previous comment, the
vehicles exiting the development would be limited to right -turn only; therefore, only sight distance
to the south would need to be met. Assuming a 15-mph speed within the parking lot the stopping
sight distance required is 80 feet from the plans there is more than 100 feet of unobstructed stopping
sight distance which would allow for a vehicle to safely stop before interacting with a vehicle going
into or out of the proposed development.
In section 5.2 Collision Summary, add note that protected LT phasing for EB & WB
traffic was added in 2017.
This has been noted; it doesn't change the overall summary of the collisions. It would be
anticipated that the 5 at angle and 1 opposite direction collisions would be reduced with this signal
modification.
• Please review Section 7 - Mitigation Recommendations. The current development
proposal is apartments, in which case the fee associated with the ITE Land Use 220
for apartments should be applied.
This development is not building apartments, we are building town homes. Using the trip
generation of 10.08 PM peak -hour trips and the fee of $5,530.21 per PM peak -hour trip is the most
appropriate way of calculating the mitigation fees before credit for the single-family unit. Under
the code the use of LUC 230, condominium, would be the next closest with a fee of $3,318.13 per
unit.
Attachments
Site Layout A-1
Gibson Traffic Consultants, Inc. July 2017
infoggibsontraffic.com 2 GTC #17-112
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