Report Dec. 4. 2008 9:49AM No. 7420 P. 5
Field Soil Observation Summary
Project: Montage Town.homes- Franklin Commons
Job number: OR 06 -9866
Project address: 9325 SW Hall Blvd. Wash.County
Daily Reports
10/24/08: GeoPacific technician, Mike Baker, was on site for inspection of subgrade for
retaining wall at southeast end of property. Subgrade is native silt. Several tree stumps have
been removed from wall backfill zone and removal areas are approximately 2 to 2.5 feet
below subgrade. Subgrade at southern 10 to 15 feet of wall has been saturated by water.
Recommended contractor overexcavate 24 inches and backfill with crushed rock, this area
was already approximately 12 inches below subgrade level. All excavated areas resisted hand
probe at approximately 2.5 to 1 inch. Contractor intends to backfill tree stump removal areas
and low areas below grade out of the water saturation zone using native soil.
10/28/08: GeoPacific technician, Jason Burgess, was on site to observe a proofroll on finish
rock. Sections to be paved are the east improvement on SW 92nd Ave. and the north
improvement on SW Borders Street. A fully loaded dup truck was used. No movement and
minimal to no deflection was seen, ok to pave.
Also observed some overexcavated sections on the keystone retaining wall for the Franklin
Commons on the west side of the property. Both areas are on the south end of the wall. Due
to elevation, areas stripped were already way below footing grade. Areas are 8' X 16' with 3
feet overexcavation and 15' X 15' with 2 feet overexcavation. Sections have been brought
back up with compacted crushed rock.
10/31/08: GeoPacific technician, Jason Burgess, was on site yesterday and today to observe
construction of the keystone retaining wall, west edge of property. The main section of the
wall is being done first, with the south end stairway walls to be constructed after. Two
perforated drain pipes have been placed, per planned detail. One behind the first block and
the other up a block or two, on the back soil cut. Geogrid has been placed about the 2nd and
5th blocks, the correct direction in 7 -foot lengths, Syntene 35.
Behind the section that requires geogrid there is a section that has to have engineered fill
placed, a gap. 3/4 " -0 crushed rock is placed in lifts and compacted.
Drain rock has been placed over the drains and behind the blocks in a on foot section all the
way up the wall.
11/4/08: GeoPacific technician, Jason Burgess, was on site 11/3/08 and today to observe
construction of the south end of the west keystone retaining wall. The south end wall runs
west to east and caps of the parking area, into the stairwell. Two drains have been used in
these areas, drain rock has been placed over the perforated drains and up the face of the walls.
7 -foot geogrid lengths have been used above the 2nd and 5th blocks on the end wall. In the
stair section grid has also been placed on the 2nd and 5th blocks, lengths have been stretched
across the whole area.
Dec. 4, 2008 9:49AM No. 7420 P. 2
Summary of Field Soil Density Tests
Project: Montage Townhomes-Franklin Common
Job number: OR 06-9866
Client: Palmer and Associates
•, . . ' ' • , .
!
Parking stalls west side of project- :
11/20/08 BC23 FG 132 7 '128.4 . 95' 97
south stalls-south
1 .
1 Parking stalls west side of project-
111/20/08 BC24 FG ;132.7 7.8 131.9. 95. 99 Passed
south stalls-north ,
•1 .
Parking stalls west side of project- • i 1
FG 1132.7 6.9 127.6 95:196 Passed
111/20/08 BC 25 north stalls-north
. ..
Parking stalls west side of project-
11/20/081BC26 . F&I 1132.7: 126.9 95.'96 Passed
!north stalls-south . , ..
'1 • ' ' I.' 1 1
Soil backfill base course 30'
110/24/081 RW1 FG 122.9 11.01120.6 95198.1 Passed ,
1 1 north of south corner i •
1 .
Soil backfill base course 60'
110/24/081 RW2 FG 122.9 10.1 120.8 95 98 Passed
: north of south corner
10/24/08 RW3 (South corner base course +2 125.4 3,5 124.5 95 99 Passed
,
10/30/08 RW4 lwall west edge straight section +., ,i;
i o 132.4 5.6 121.0 901 91 Passed
!south . 1
1 1
1 ..
1 Wall west edge straight section 8. 1
10/30/08 . RW5 +16" 132.4: 4. 123.9 901 94 Passed
, center
1 1
.
. 1 1
Wall west edge straight section .
10/30/08. RW6 +16" • 132.4 5.2 121.7 901 92 Passed
1 • .
Wall west edge straight section
'10/31/08. RW7 +40"1 132.4 4.5 122.2 90 t 92 Passed
north 1. .
Wall west edge straight section
10/31/08 RW8 +40" 132453 122.7 90 93 Passed
center ; SI
. •
0/31/08 1 RW9
Wall west edge straight section 4_,, 40 1
.11 :
1 south 132.4 4.3 121.2 901 92 Passed
!
Wall west edge straight section
10/31/08 JRW10 FG . 1132.4 4.6 129.5 90 98 Passed
1 south
1 Wall west edge straight section F , .,... •
110/31/08 RW11 • center - - FG . 6.1 124.9 90 94 Passed
.
e • • ." . . " . ' • -
10/31/08 .
1Wall wes g
t ede straight section S.
1RW12 FG • 132.4.1 5.4 122.4 901 93 Passed
‘inorth
Dec. 4. 2008 9:49AM No. 7420 P. 3
West retaining wall south end
11/3/08 RW13 east 132.4. 5.8 121.5 ! 90 92 Passed
( West retaining wall south end
} 11 /3/08 RW 14 ' west +2 ! 1132.4 i 5.3 ;122.2 92 Passed
f
11/3/08 RW 15 West retaining wall south end +16" 132.4 6.4 120.6 91 Passed
stair section I f
11/4/08 RW 16 l east t retainin wall south end ; ,132.4: 5.6 121.4190 92 1 Passed
1
West retaining wall south end t
11/4/08 RW 17 west +4 i132.4 5.6 , 123.7 90 i 93 'Passed
1
11/4/08 .RW18 West retaining wall south end +32" 132.4 4.9 ;121.0 190 91 Passed
stair section
10/31/08' SF1 West edge behind backfill zone +2 :1132.4: 3.7 125.0 .90 94 Passed
north I 1
10/31/08 SF2 I south edge behind backfill zone I ±2 132.4 4.8 126.0 90 j 95 'Passed
West edge behind backfill zone . I 1
10/31/08; SF3 north i FG s 132.4 6.0 126.7 90 96 Passed •
West edge behind backfill zone E
10/31/08 SF4 south FG • 132.4 5.0 125.41901 95 !Passed
1 E I I 'I
Dec. 4. 2008 9 : 49AM No. 7420 P. 4
Summary of Field Asphaltic Concrete p e Density Tests
Project: Montage Townhomes- Franklin Commons
Job number: OR 06 -9866
Project address: 9325 SW Hall Blvd. Wash.County
Rice density: 151.9 Marshall value: Method of test: Indirect Serial #: 36169
Description: "C" Mix Modified from Knife River Coffee Lake
1 Date of Test ! Com p In
Test location t 1 Iace ac- i
test number number density lion
11/21/08 ; 1 ;West edge parking stalls -south stalls -south I TOP I 139.8 I 92.0
111/21/08 ? 2 'West edge parking stalls - south stalls -north i TOP 139.91 92.1
111/21/081 3 j West edge parking stalls -north stalls-south TOP 140.4 92.4
111 /21 /08 4 f West edge p arkin stalls -north stalls-north I .. 1 - - -- - 9 ...__.....
_ � � g parking lls -north TOP: 13
f 9.9 � 92.1
/ ) zae g'
:.n►
RECEIVED
Walter H. Knapp & Associates, LLC A UG 1
Consultants in Silviculture, Arboriculture and Urban Forestry 8 2008
0840
CITY OF TIGARD
BUILDINe [IVI$ION
Franklin Commons Arborist Report'
August 11, 2008
Expansion of the parking lot at Franklin Commons will affect several trees on the east
boundary of the complex. To facilitate enlargement of the parking lot, a keystone wall will
be installed along the east boundary. I visited the site on July 22 to examine the affected
trees and evaluate their condition. Based on discussions with Alpha Community
Development, I also developed recommendations for protecting the trees during construction
and providing for their long -term sustainability.
Tree Species and Condition
All of the trees along the east site boundary are ponderosa pines (Pinus ponderosa). This
species is relatively hardy and adapted to a wide range of site conditions. Nevertheless, low -
vigor or damaged pines are vulnerable to attack by bark beetles, especially the mountain
pine beetle (Dendroctonus ponderosae). Mortality of such trees is common.
I identified three ponderosa pines with a high probability of mortality from bark beetles.
These trees are designated on the site plan. Based on the characteristics described in the
following table, I recommend that they be removed during parking lot expansion. This
would avoid conflicts with the use of the site after construction.
Table 1. Size and characteristics of ponderosa pines recommended for removal.
DBH Condition
18 Broken top, poor condition.
30 Thin crown, low vigor.
18 Dead top, live crown ratio —20%, suppressed, low vigor.
Tree Protection Recommendations
• Tree protection fencing should be placed as far from the trees as possible to permit
construction of the keystone wall. Chain link fence panels will provide the best
protection and still permit relocation as needed to permit operations to proceed. The
general location of protection fencing is shown on the site plan/tree protection plan,
but the actual location will be determined in the field by the arborist.
• No materials or supplies should be stored within the protection area, and the
protection fence should not be moved or relocated without approval of the arborist.
' This report is provided at the request of Alpha Community Development.
7615 SW Dunsmuir Lane, Beaverton, OR 97007
Phone: (503) 646 -4349 Fax: (503) 746 -6414
a. '•w
Page 2 of 2
0840 Franklin Commons Arb.doc
8/11/2008
Walter H. Knapp
• The arborist should provide regularly scheduled tree protection inspections during
periods of active construction in tree protection areas.
• The fill profile for the tree root zone within the expansion area of the parking lot
should be constructed according to the diagram shown in figure 1. The intent of this
design is to provide oxygen and water to the root system and ensure long -term
sustainability.
Figure 1. Fill profile for protection of root zones within the parkin_ lot.
surfacing
9
a l clean crushed rock 2 " +, no fines
geotextile fabric - permeable to air and water
native soil remove litter la er no excavation within root area
Sample profile for areas within Critical Root Zones. Depth of rock is dependent on
grading. Technique based on best management practices.
Summary
Three of the ponderosa pines near the parking lot expansion area at Franklin Commons
should be removed due to condition. The remaining trees can be protected and sustained if
the recommended steps are followed.
Walter H. Knapp
Certified Forester, SAF 406
Certified Arborist, ISA PN -0497A
Enclosure: site plan/tree protection plan
2 Note that we used this profile successfully in Tigard on Bretton Woods and Moore's Meadow (details
available upon request).
7615 SW Dunsmuir Lane, Beaverton, OR 97007
Phone: (503) 646 -4349 Fax: (503) 265 -8117