2014, 10-31 Permit: BLd-2014-2542 Letter of Compliance (TS;
Northern, Inc.
Consulting Engineers Environmental Scientists Construction Materials Testing
October 31, 2014 GN Northern Job#: 214-531
Rock Placing Company
RPC, LLC
14115 E. Trent
Spokane Valley, WA, 99216
Attention: Mr. Ryan Yeoman, Project Manager
Subject: Observation of Rockery Wall Construction- Final Letter of Compliance
1815 S. Ridgemont Drive
Spokane Valley, Washington
GN Northern, Inc [GNN] is pleased to submit this brief letter, documenting our field observations performed
during construction of a new tiered rockery retaining wall at 1815 S. Ridgemont Drive in Spokane Valley,
Washington. GNN's observation services were provided from October 27th through October 31st, 2014 for
the rockery wall constructed at the above referenced project site. Our services were performed to ensure
construction of the new rockery retaining wall was completed in general compliance with our design, project
specifications,and applicable building codes.
Our services during construction of the new rockery wall included observation of the preparation of the
keyway(s), placement of the base rock(s), installation of the drain, verification that appropriate materials
were used, and appropriate construction guidelines were followed. Earthwork monitoring included
observation of foundation bearing subgrade and placement of the backfill. The subgrades were excavated to
the required depths and widths and backfilled with approved structural fill material in uniform compacted
lifts.
The rockery retaining wall observation services were performed under the supervision of a Washington State
licensed professional engineer. Within the scope of GN Northern's quality control observation services, I
have reviewed the construction of this project's improvements and to my knowledge find it to be in
substantial conformance with the project plans and specifications.
We appreciate the opportunity to provide our professional services. Please contact our office if there are any
questions or comments concerning this report. v p...H•�q,,M
�Sinc ' ..w�•
erely, c) tii,Z
2
GN Northern, Inc. Digitally signed by Ka Harti; . GJ L
DN:cn=Karl A.Harm. o=G e
--X/.47/ —_ Northern,Inc.,n@ i r 2.1
r�_�pJ\c 1l 4` email=kharmon@gnn ,n�om, r
�� c=US •
Karl A. armon, L G, PE
Date:2014.10.31 14:17:- -.�•r'.:r•(..41534/ (vQ•;����///
t v
Senior Geologist/Engineer SioNALt;*4
I Expires 08/02/2015 I
722 N 16th Avenue,Suite 31 2618 W Kennewick Ave 11115 E.Montgomery Ste C 10623 N Government Way 4140 Westcliff Drive 81006 HWY 395
Yakima WA 98902 Kennewick WA 99336 Spokane Valley WA 99206 Hayden ID 83835 Hood River OR 97031 Hermiston OR 97838
509/248-9798 509/734-9320 509-893-9400 208-772-2422 541/387-3387 541/564-0991
509/248-4220 Fax 509/734-9321 Fax 877-258-9211 Fax 877-258-9211 Fax 541/388-3388 Fax
Visit our website at www.snnorthern.com
Email:ennorthern a gnnorthem.com