AW Residence Grading Extension-Wet SeasonAw Residence Revised September 6, 2019
9527 190th Place SW Project #18102
Edmonds, Washington
Strobl Design LLC
iacob@strobidesign.com �p P IN
Attention: Jacob Strobl "J
Subject: Grading Season Extension —Aw Residence q lotzbIg
City of Edmonds Permit #: BLD20190116
Mr. Strobl:
The purpose of this letter is to provide our opinion with respect to a grading season extension.
Based on our recent correspondence, it is our understanding that the normal grading season
restriction for geologically hazardous areas is from October 111 through May 1st. To facilitate
efficient construction, a reduction of the grading restriction is desired. For the sake of brevity,
we presume that people reading this letter are highly familiar with the subject property and the
proposed development. The remainder of this letter will set forth our opinions on extending
the grading season for the proposed development of the subject property.
Summary of Soil Conditions and Statement of Minimal Risk
The native Vashon advance outwash soils are dense in -place, relatively permeable, and
moderately resistant to erosion, except when subjected to concentrated flows. Based on our
review of the site topography, the native soils present, and the proposed grading and
temporary erosion and sediment control plan prepared by CG Engineering, it is our opinion that
the site work may be performed through the wet season and this construction, the areas
disturbed by construction will remain stable, there will not be an increase in the potential for
soil movement, and the risk of damage to the subject property and adjacent properties will be
minimal.
Review of Wet Season Work Schedule
Though some weather work is required to facilitate timely construction, it is our understanding
that there is an intent to limit earthwork during the wet season. The intent is to start
construction in mid -September and to have the foundation excavation, foundation concrete
placed, and foundation backfill, and temporary soil stabilization completed by mid -November.
Then final grading and landscaping will be completed next year. The following contractor
schedule was provided via e-mail for our review by Strobl Design:
Start: Mid -September
• Grub site, install filter and high visibility fencing, construction entrance
,remove certain trees, remove stumps, haul logs.
• 2-weeks
• Excavate for foundation including removal of unsuitable soil, import and
compaction of compactable soil if necessary.
• 1-week
• install foundation. Waterproofing, footing and roof drainage.
• 3-weeks.
SOUTH FORK GEOSCIENCES, PLLC Page 1
PO Box 1 275
NORTH BEND, WA 98045
425-890-4858 1 INFO@SFG EO. CO M
Aw Residence Revised September 6, 2019
9527 1901h Place SW Project #18102
Edmonds, Washington
• Backfill
• 1-week
TESC. as required.
• 1-week
Total - 8 weeks
This construction scheduling and phasing is consistent for the standard of practice for the Puget
Sound region. As previously stated, it is our opinion that the site work may be performed
through the wet season and this construction, the areas disturbed by construction will remain
stable throughout construction.
Closure
We have enjoyed working with you and we are confident that this letter will aid in the
permitting roject. If there are any questions, please feel free to contact us.
Sincer 8S
Andrew L. Glandon
An ,
Engineering Geologist / Owner
South Fork Geosciences, PLLC
Cc: City of Edmonds
Attention: Building Department
SOUTH FORK GEOSCIENCES, PLLC Page 2
PO Box 1 275
NORTH BEND, WA 98045
42 5-890-4858 1 I N FOCaSFG EO. CO M
Szafran, Michele
From: Jacob Strobl <jacob@strobldesign.com>
Sent: Friday, September 6, 2019 10:23 AM
To: Szafran, Michele
Subject: RE: BLD2019-0116 AW - Ground Disturbance Timeline Extension
Hi Michele,
Per our phone call, final grading would not occur until the summer of 2020.
Thanks,
Jacob
STROBL DESIGN LLC
206.661.3622
strobldesign.com
From: Jacob Strobl [mailto:jacob@strobldesign.com]
Sent: Friday, September 06, 2019 9:40 AM
To:'Szafran, Michele' <Michele.Szafran@edmondswa.gov>
Cc:'ChakAw' <chakaw63@gmail.com>;'EVA PETERSON' <pch builder@ msn.com>; 'Andrew Glandon'
<Andrew@sfgeo.com>
Subject: RE: BLD2019-0116 AW - Ground Disturbance Timeline Extension
Hi Michele,
Please see the updated letter addressing your comments in your email below regarding timeline. Let me know
if you need any additional information.
Thanks,
Jacob
STROBL DESIGN LLC
206.661.3622
strobldesign.com
From: Szafran, Michele[maiIto: Michele.Szafran @edmondswa.gov]
Sent: Thursday, September 05, 2019 9:46 AM
To: 'Jacob Strobl' <iacob@strobldesign.com>
Cc:'ChakAw' <chakaw63@gmail.corn>;'EVA PETERSON' <pchbuilder@msn.com>
Subject: RE: BLD2019-0116 AW - Ground Disturbance Timeline Extension
Jacob,
The seasonal restrictions are from October thru April so any ground disturbing activity during this time should be clearly
addressed by the Geotech. The remaining question regarding the Grading Season Extension letter is what ground
disturbing activity will take place after mid -November? The letter states that final grading and landscaping can be
completed next year, if that's January next year that would need to be in the letter, or if that's April then state that.