March 17, 2020 Mr. James Tosti McCormick Communities 805 ... · TP-4 TP-5 TP-6 TP-7 TP-8 IT-1 IT-2...
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Corporate Office 17522 Bothell Way Northeast Bothell, Washington 98011 Phone 425.415.0551 ♦ Fax 425.415.0311 www.riley-group.com March 17, 2020 Mr. James Tosti McCormick Communities 805 Kirkland Avenue, Suite 200 Kirkland, Washington 98033 Subject: Large-Scale Pilot Infiltration Test McCormick Woods Parcel A McCormick Woods Drive SW & St. Andrews Drive SW Port Orchard, Washington RGI Project No. 2019-088B Dear Mr. Tosti: As requested, The Riley Group, Inc. (RGI) is pleased to provide the results of the Large-Scale Pilot Infiltration Test completed at the request of the City at the proposed McCormick Woods Parcel A residential development Site, located in Port Orchard, Washington (Figure 1). RGI previously completed infiltration assessments at the Site which is summarized in our reports: “Infiltration Assessment, McCormick Woods Parcel A, McCormick Woods Drive SW & St. Andrews Drive SW, Port Orchard, Washington, dated June 26, 2019.” “Supplemental Infiltration Assessment, McCormick Woods Parcel A, McCormick Woods Drive SW & St. Andrews SW, Port Orchard, Washington, dated December 3, 2019” The results of our Large Scale Pilot Infiltration Test (PIT) completed within the footprint of the proposed Parcel A Stormwater Pond is summarized below. Project Description The project site is located on the northeast corner of McCormick Woods Drive Southwest & St. Andrews Drive Southwest in Port Orchard, Washington. The approximate location of the site is shown on Figure 1. RGI understands the site is to be developed with a 55 lot residential development. An access road will wind through the site with entrance/exit areas on McCormick Woods Drive Southwest and St. Andrews Drive Southwest. A stormwater pond will be located in the northern portion of the site. Subsurface Conditions RGI oversaw the completion of a Large Scale Pilot Infiltration test (IT-201) within the footprint of the proposed Parcel A stormwater pond, as shown on Figure 2. Subsurface conditions in infiltration test IT-201 included three feet of reddish brown silty sand with gravel underlain by gray sand with some silt. Subsurface conditions were similar in test pit TP-201 completed south of the proposed pond location.
Transcript of March 17, 2020 Mr. James Tosti McCormick Communities 805 ... · TP-4 TP-5 TP-6 TP-7 TP-8 IT-1 IT-2...
Corporate Office 17522 Bothell Way Northeast Bothell, Washington 98011 Phone 425.415.0551 ♦ Fax 425.415.0311
www.riley-group.com
March 17, 2020
Mr. James Tosti McCormick Communities 805 Kirkland Avenue, Suite 200 Kirkland, Washington 98033
Subject: Large-Scale Pilot Infiltration Test
McCormick Woods Parcel A McCormick Woods Drive SW & St. Andrews Drive SW
Port Orchard, Washington RGI Project No. 2019-088B
Dear Mr. Tosti:
As requested, The Riley Group, Inc. (RGI) is pleased to provide the results of the Large-Scale Pilot Infiltration Test completed at the request of the City at the proposed McCormick Woods Parcel A residential development Site, located in Port Orchard, Washington (Figure 1). RGI previously completed infiltration assessments at the Site which is summarized in our reports:
“Infiltration Assessment, McCormick Woods Parcel A, McCormick Woods Drive SW & St. Andrews Drive SW, Port Orchard, Washington, dated June 26, 2019.”
“Supplemental Infiltration Assessment, McCormick Woods Parcel A, McCormick Woods Drive SW & St. Andrews SW, Port Orchard, Washington, dated December 3, 2019”
The results of our Large Scale Pilot Infiltration Test (PIT) completed within the footprint of the proposed Parcel A Stormwater Pond is summarized below.
Project Description
The project site is located on the northeast corner of McCormick Woods Drive Southwest & St. Andrews Drive Southwest in Port Orchard, Washington. The approximate location of the site is shown on Figure 1.
RGI understands the site is to be developed with a 55 lot residential development. An access road will wind through the site with entrance/exit areas on McCormick Woods Drive Southwest and St. Andrews Drive Southwest. A stormwater pond will be located in the northern portion of the site.
Subsurface Conditions
RGI oversaw the completion of a Large Scale Pilot Infiltration test (IT-201) within the footprint of the proposed Parcel A stormwater pond, as shown on Figure 2. Subsurface conditions in infiltration test IT-201 included three feet of reddish brown silty sand with gravel underlain by gray sand with some silt. Subsurface conditions were similar in test pit TP-201 completed south of the proposed pond location.
lstone
Static Received Stamp
lstone
Text Box
LU19-PLAT PRELIM-02
USGS, 2014, Bremerton West, WashingtonUSGS, 2017, Burley, Washington
7.5-Minute Quadrangle
Approximate Scale: 1"=1000'
0 500 1000 2000 N
Site Vicinity Map
Figure 1
03/2020
Corporate Office17522 Bothell Way NortheastBothell, Washington 98011Phone: 425.415.0551Fax: 425.415.0311
McCormick Woods Parcel ARGI Project Number:
2019-088BDate Drawn:
Address: McCormick Woods Dr. Southwest & St. Andrews Dr., Port Orchard, Washington 98367
SITE
TP-1
TP-2
TP-3TP-4
TP-5
TP-6
TP-7
TP-8
IT-1
IT-2
MW-1
MW-2
IT-101
IT-102
TP-101TP-102
TP-103
TP-201
IT-201
N
Geotechnical Exploration Plan
Figure 2
Approximate Scale: 1"=200'
0 100 200 400
= Test pit by RGI, 03/12/20= Large-scale infiltration test pit by RGI, 03/12/20= Infiltration test pit by RGI, 10/30/19= Test pit by RGI, 10/30/19= Monitoring well, 10/30/19= Infiltration test pit by RGI, 06/10/19= Test pit by RGI, 04/30/19= Site boundary
03/2020
Corporate Office17522 Bothell Way NortheastBothell, Washington 98011Phone: 425.415.0551Fax: 425.415.0311
McCormick Woods Parcel ARGI Project Number:
2019-088BDate Drawn:
Address: McCormick Woods Dr. Southwest & St. Andrews Dr., Port Orchard, Washington 98367
Project Name: McCormick Woods
Project Number: 2019-088B
Client: Windward
Test Pit No.: TP-201
Date(s) Excavated: 3/12/2020
Excavation Method: Test Pit
Excavator Type: Tracked Excavator
Groundwater Level: 13'
Test Pit Backfill: Cuttings
Logged By ELW
Bucket Size: N/A
Excavating Contractor: Client Provided
Sampling Method(s)
Location McCormick Woods Drive SW and St. Andrews Drive SW, Port Orchard, WA
Surface Conditions: Mixed Brush/Ferns
Total Depth of Excavation: 14 feet bgs
Approximate Surface Elevation 384
Compaction Method Bucket tampU
SC
S S
ymbo
l
TPSL
SM
SP-SM
REMARKS AND OTHER TESTSGra
phic
Log
MATERIAL DESCRIPTION
6" topsoil
Reddish brown silty SAND with trace gravel, loose to medium dense, moist
Becomes tan, medium dense
Gray SAND with some silt and trace gravel, medium dense to dense, moist
Becomes dense
Becomes wet
Becomes water bearing
Test Pit terminated at 14'
Dep
th (
feet
)
0
5
10
15
Sam
ple
Num
ber
Sam
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Typ
e
Ele
vatio
n (f
eet)
384
379
374
369
Sheet 1 of 1
The Riley Group, Inc. 17522 Bothell Way NE, Bothell, WA 98011
Project Name: McCormick Woods
Project Number: 2019-088B
Client: Windward
Test Pit No.: IT-201
Date(s) Excavated: 3/12/2020
Excavation Method: Test Pit
Excavator Type: Tracked Excavator
Groundwater Level: Not Encountered
Test Pit Backfill: Cuttings
Logged By ELW
Bucket Size: N/A
Excavating Contractor: Client Provided
Sampling Method(s)
Location McCormick Woods Drive SW and St. Andrews Drive SW, Port Orchard, WA
Surface Conditions: Mixed Brush/Ferns
Total Depth of Excavation: 8 feet bgs
Approximate Surface Elevation 380
Compaction Method Bucket tampU
SC
S S
ymbo
l
TPSL
SM
SP-SM
REMARKS AND OTHER TESTSGra
phic
Log
MATERIAL DESCRIPTION
6" topsoil
Reddish brown silty SAND with trace gravel, loose to medium dense, moist
Becomes medium dense
Gray SAND with some silt, medium dense to dense, moist
Large 10'X10' PIT infiltration test conducted at 8'
Dep
th (
feet
)
0
5
10
15
Sam
ple
Num
ber
Sam
ple
Typ
e
Ele
vatio
n (f
eet)
380
375
370
365
Sheet 1 of 1
The Riley Group, Inc. 17522 Bothell Way NE, Bothell, WA 98011
Project Name: McCormick Woods
Project Number: 2019-088B
Client: Windward
Key to Logs
US
CS
Sym
bol
REMARKS AND OTHER TESTSGra
phic
Log
MATERIAL DESCRIPTIONDep
th (
feet
)
Sam
ple
Num
ber
Sam
ple
Typ
e
Ele
vatio
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eet)
1 2 3 4 5 6 7 8
COLUMN DESCRIPTIONS
1 Elevation (feet): Elevation (MSL, feet).2 Depth (feet): Depth in feet below the ground surface.3 Sample Type: Type of soil sample collected at the depth interval
shown.4 Sample Number: Sample identification number.
5 USCS Symbol: USCS symbol of the subsurface material.6 Graphic Log: Graphic depiction of the subsurface material
encountered.7 MATERIAL DESCRIPTION: Description of material encountered.
May include consistency, moisture, color, and other descriptivetext.
8 REMARKS AND OTHER TESTS: Comments and observationsregarding drilling or sampling made by driller or field personnel.
FIELD AND LABORATORY TEST ABBREVIATIONS
CHEM: Chemical tests to assess corrosivityCOMP: Compaction testCONS: One-dimensional consolidation testLL: Liquid Limit, percent
PI: Plasticity Index, percentSA: Sieve analysis (percent passing No. 200 Sieve)UC: Unconfined compressive strength test, Qu, in ksfWA: Wash sieve (percent passing No. 200 Sieve)
MATERIAL GRAPHIC SYMBOLS
Silty SAND (SM) Poorly graded SAND with Silt (SP-SM)
Topsoil
TYPICAL SAMPLER GRAPHIC SYMBOLS
Auger sampler
Bulk Sample
3-inch-OD California w/brass rings
CME Sampler
Grab Sample
2.5-inch-OD ModifiedCalifornia w/ brass liners
Pitcher Sample
2-inch-OD unlined splitspoon (SPT)
Shelby Tube (Thin-walled,fixed head)
OTHER GRAPHIC SYMBOLS
Water level (at time of drilling, ATD)
Water level (after waiting)
Minor change in material properties within astratum
Inferred/gradational contact between strata
? Queried contact between strata
GENERAL NOTES
1: Soil classifications are based on the Unified Soil Classification System. Descriptions and stratum lines are interpretive, and actual lithologic changes may begradual. Field descriptions may have been modified to reflect results of lab tests.2: Descriptions on these logs apply only at the specific boring locations and at the time the borings were advanced. They are not warranted to be representativeof subsurface conditions at other locations or times.
Sheet 1 of 1
The Riley Group, Inc. 17522 Bothell Way NE, Bothell, WA 98011
