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07-18-2019-mock-residence-retaining-wall-reconstruction-18b291-01-ipd-soil-compaction-report-d209458 (1)MTC Materials Testing & Consulting, Inc. s Geotechnical Engineering & Consulting o Special Inspection o Materials Testing o Environmental Consultingacw�"`"`'" Mock Residence Retaining Wall Reconstruction - 18I3291-01 - IPD-Soil Compaction: Report #D209458 CLIENT Darrin Mock DATE 07/18/2019 PROJECT LOCATION 21100 88th Place West Edmonds WA PERMIT # Inspection Information: Inspection Date: Time Onsite: 7:30 - Weather Overcast, 60's, light intermittent rain 07/18/2019 8:45 AM Conditions: Inspection Performed: IPD-Soil Compaction Field Data: Work / Location: IPD-S / Behind retaining wall Gauge Standard MS: 602 Equipment ID & Serial #: Troxler 3430D, Ser. #19286 Gauge Standard DS: 1595 Test Samples: Sample #: Description: Proctor Value(pcf): Optimum Moisture and Oversize Rock Correction: 1. B19 0611 SP-SM, Poorly graded Sand with Silt and Gravel 124.2 JOMC = 6.8%, ORC = 24% 2. B19 0611 SP-SM, Poorly graded Sand with Silt and Gravel 117.9 OMC = 8.7%, No ORC N(uncorrected) TEST METHOD 0 ASTM D-1557 /AASHTO T-180 In Place Density Test Results (ASTM D-6938): Test Mode / # Depth Location of Test Elev. Wet Dens. Dry Moist % Sample Dens. # % Comp. % Regd. 1 ®10' E of W end SG + 3' 117.6 98.4 19.5 0 83.5 95 2 ®10' W of E end SG + 3' 118 100.7 17.2 0 85.4 95 3 ®10' W of E end SG + 2' 119.6 103.4 15.7 0 87.7 95 4 ®10' W of E end SG + 1.5' 124.7 112.4 10.9 0 95.3 95 ® Native Soils Soils consistent with Proctor O Yes O No ❑ 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 arrived on site as requested by client to perform compaction tests on native material placed as fill for the backside of the retaining wall. Material had been previously approved for use based on visual inspection pending lab testing, and was placed and compacted prior to MTC's arrival. Approximately 2.0 to 2.5 feet of material had been placed over the base cut level behind the wall, and MTC was informed that it had been compacted every 4 to 6 inches with a vibratory plate compactor. Geotextile was pending placement at 3' above base of wall, and MTC was informed there was another level of mesh located at 1' above wall base per MTC's wall design plans. The geogrid extended the length of the wall and spanned from the backside of the wall to undisturbed native soil surpassing the minimum width required. Upon arrival, we noted conditions were wet from rain the prior night and early morning. No proctor was available at the time, however when tests were performed the density readings were much lower than typical soils of similar content. Moisture readings were also observed to be highly elevated nearing 20%. Soils at the test level probed 6 to 8 inches with little effort due to saturated conditions. MTC requested the contractor to excavate a pot hole to investigate the fill at lower levels. This was repeated, and it was found that moisture decreased and density increased with depth to a more reasonable level. Corporate • 777 Chrysler Drive o 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, 0711812019, #D209458, Page 1 of 2 MTC Materials Testing & Consulting, Inc. s Geotechnical Engineering & Consulting • Special Inspection • Materials Testing • Environmental Consulting'�AsC�"°`' n` MTC deemed the soil at about 18" above wall base grade as suitable based on probing and test results, and that material below this elevation was usable. Further excavation was not done to avoid damaging the lower geogrid. It was decided that the material above this elevation would need to be removed and replaced with new material. The contractor was informed on site of the results and agreed to replace the upper approximately 1.5 feet of fill. Final report includes laboratory data. The lowermost test passes 95% compaction using proctor value without rock correction, accounting for some observed variability. The other tests above within the material to be replaced are confirmed to be failing compaction. MTC agreed to return to test new fills once prepared. Work in progress. Additional inspection needed. Images: UPLOADED: 07/18/2019 19:35:22 Digging UPLOADED: 07/18/2019 19:37:02 Behind through wet fill to test below retaining wall looking East REPORTED BY: Leigh Robinette 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, 0711812019, #D209458, Page 2 of 2