Loading...
HomeMy WebLinkAbout20160674E002 Bethany Corner 2021-03-31 FR 006.pdf Kirkland | Tacoma | Mount Vernon 425-827-7701| www.aesgeo.com Date Mailed: Principal / PM: Matthew A. Miller, P.E. This document is considered a DRAFT until signed or initialed by an AESI Principal or Project Manager Page 1 of 3 v.7.20 FIELD REPORT Date Project Name Project No. Report No. 2021-03-31 Bethany Corner 20160674E002 006 Location Municipality AESI Project Manager AESI Field Rep 16451 111th Ave SE Renton Matthew A. Miller, P.E. Zach Skelton, E.I.T. Permit No. Client/Owner Attn Requested By Mark Seek (Tiger Mountain Homes) Mark Seek Contractor Engineer/Architect General Contractor Grading Contractor Weather D.R. Strong Tiger Mountain Homes / Mark Fury Site Works P. Cloudy 50’s THE FOLLOWING WAS NOTED: Associated Earth Sciences, Inc. (AESI) arrived on site at approximately 10:00 am and stayed until approximately 12:30 pm at the request of the contractor to observe sanitary sewer main and side sewer backfill. While on site we met with Mark Seek with Tiger Mountain Homes and Mike Day of Fury Site Works. Sanitary Sewer Main and Side Sewer Backfill Prior to our arrival, Fury had completed excavation and installation and backfill of the Lot 7 and Lot 8 side sewers as well as excavation, installation, and pea gravel coverage of the Lot 5 side sewer. Upon our arrival, the contractor was excavating a trench up to approximately 10 feet deep for the Lot 6 side sewer. AESI observed the contractor install a 6- inch T600 PVC pipe. The contractor informed us the T600 was used in the road area and a 6-inch SDR-35 PVC pipe was used in the areas outside of the road. This pipe was bedded and covered in approximately 3 inches and 12 inches of pea gravel, respectively. The contractor informed us the existing grade for the Lot 4 side sewer is lower than the bottom-of-pipe elevation in the road area and requires fill to reach elevation. While on site, AESI observed the contractor fill this area with recycled concrete and compact it with a HAMM 3077 smooth vibratory drum roller. Upon our departure, the contractor was preparing to begin excavation for the Lot 4 side sewer. Upon our arrival, the contractor was backfilling the eastern portion of the sanitary sewer main to surrounding existing grade. The contractor informed us that this area was lower than designed stormwater pipe elevations and required backfill. Backfill consists of imported gravel borrow, which is a gray-brown coarse sand and gravel with trace silt. Compaction was achieved with a HAMM 3077 smooth vibratory drum roller. The backfill material appeared firm and unyielding under equipment. Compaction tests were performed at depth and at grade. Per Soos Creek Water & Sewer district, a minimum of 90% compaction is required for areas 3 feet below grade or deeper and a minimum 95% compaction is required for areas shallower than 3 feet below grade (see Figure 2). AESI intends to return tomorrow to continue monitoring side sewer and sanitary sewer main backfill. The contractor also informed AESI they intend to begin excavation for stormwater piping on 111th Ave SE tomorrow. Table 1: Compaction Results of Tests Taken Today Test Location Depth below grade (ft) Dry Density (pcf) M % Proctor (pcf), ASTM D: 1557 Opt.M% %Compaction Pass/Fail* 1 Sewer, Figure 1 2 140.1 7.6 141.3 7.7 99 Pass 2 Sewer, Figure 1 6 130.0 8.5 141.3 7.7 92 Pass 3 Sewer, Figure 1 0 138.4 8.7 141.3 7.7 98 Pass 4 Sewer, Figure 1 3 133.5 7.8 141.3 7.7 95 Pass 5 Sewer, Figure 1 0 137.1 8.2 141.3 7.7 97 Pass *Minimum 90% compaction required for tests deeper than 3 feet or deeper, minimum 95% compaction required for tests shallower than 3 feet. Date Project Name Project No. Report No. 2021-03-31 Bethany Corner 20160674E002 006 Page 2 of 3 FIELD REPORT Figure 1 – Location of sewer observed by AESI today shown in red. Green shows sewer still in progress upon our departure. Approximate locations of compaction tests shown in yellow. NN MH 1381-2 2 1 4 3 5 Date Project Name Project No. Report No. 2021-03-31 Bethany Corner 20160674E002 006 Page 3 of 3 FIELD REPORT Figure 2 – Trench detail from Soos Creek Water & Sewer District showing compaction requirements.