07-22-2019-mock-residence-retaining-wall-reconstruction-18b291-01-ipd-soil-compaction-report-d209632MTC
Materials Testing & Consulting, Inc.
Geotechnical Engineering & Consulting • Special Inspection • Materials Testing • Environmental Consulting
Mock Residence Retaining Wall Reconstruction - 18I3291-01 - IPD-Soil Compaction:
Report #D209632
CLIENT Darrin Mock DATE 07/22/2019
PROJECT LOCATION 21100 88th Place West Edmonds WA PERMIT #
Inspection Information:
Inspection Date: Time Onsite: 7:00 Weather 60, Sunny, dry
07/22/2019 am Conditions:
Inspection Performed: IPD-Soil Compaction
Field Data:
Work / Location: IPD-S / Behind retaining wall Gauge Standard MS: 638
Equipment ID & Serial #: Troxler 3430E, Ser. #19148 Gauge Standard DS: 1443
Test Samples:
Sample #: Description: Proctor Value(pcf): Optimum Moisture and Oversize Rock
Correction:
1. B19 0611 SP-SM, Poorly graded Sand with Silt and 124.2 OMC = 6.8%, ORC = 24%
Gravel
TEST METHOD
0 ASTM D-1557 /AASHTO T-180
In Place Density Test Results (ASTM D-6938):
Test Mode / Location of Test Elev. Wet Dry Moist % Sample % Comp. % Regd.
# Depth Dens. Dens. #
1 ®S End of retaining wall SG +3' 132.9 123.4 7.7 0 99.4F 95
2 ®N End of retaining wall SG +3' 134.7 128.3 00 103.3 95
® Native Soils Soils consistent with Proctor O Yes O No
O Imported Fills Soils found to be firm and stable; and to the best of our knowledge, meet O Yes O No
compaction
Contractor notified of results O Yes O No
Remarks:
MTC was on site as requested to perform compaction testing on backfill placed behind the block retaining wall.
Due to failing tests on saturated material during MTCs prior visit, the contractor had removed the top 1.5' of material, re-
worked and replaced it with drier material as recommended. MTC was informed that material was placed in 4-6" lifts and
compacted with a plate compactor. The material consisted of existing (native) material mixed with some imported fill for
moisture and fines control.
Compaction testing produced results of greater than 95% with moisture levels near optimum. MTC found soil conditions
to be firm and non -yielding. Elevated readings are attributed to the intermixing of imported sand and gravel material.
The contractor will continue to place backfill material in the manner done to achieve passing results. MTC advised them
to keeps lifts to approx 4" to 6" maximum due to use of a plate compactor.
While on site, MTC observed the 3-foot level of geogrid was ready for placement over the backfills at the level tested, per
plans.
To the best of MTC inspector's knowledge, the above -described work was performed in general accordance with project
Corporate • 777 Chrysler Drive • Burlington, WA 98233 • Phone 360.755.1990 • Fax 360.755.1980
Regional Offices: Olympia Bellingham Silverdale Tukwila
360.534.9777 3 60.64 7.6111 360.698.6787 206.241.1974
Visit our website: www.mtc-inc.net
Mock Residence Retaining Wall Reconstruction - 1813291-01, 0712212019, #D209632, Page 1 of 2
Materials Testing & Consulting, Inc.
Geotechnical Engineering & Consulting • Special Inspection • Materials Testing • Environmental Consulting
specifications and approved plans.
Images:
UPLOADED: 07/22/2019 07:32:53
REPORTED BY: Jeff Voigt REVIEWED BY: John Gillaspy, Project Manager
Corporate • 777 Chrysler Drive • Burlington, WA 98233 • Phone 360.755.1990 • Fax 360.755.1980
Regional Offices: Olympia Bellingham Silverdale Tukwila
360.534.9777 360.647.6111 360.698.6787 206.241.1974
Visit our website: www.mtc-inc.net
Mock Residence Retaining Wall Reconstruction - 18B291-01, 0712212019, #D209632, Page 2 of 2