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Report (22) GeoP _ \1---1--4 v C ", .- Engin+eering.inc. Real-World Geotechnical Solutions 14835 SW 72nd Avenue Tel (503) 598-8445 Investigation • Design •Construction Support Portland, Oregon 97224 Fax(503) 941-9281 DAILY FIELD REPORT PROJECT DATE 72nd Avenue Apartments 9/17/2018 PROJECT NUMBER WEATHER 17-4626 Clear,70°F CLIENT CONTRACTOR Hill Architects DBEC PERMIT NUMBER PAGE# 1 of 2 Inspection Notes: (Include location,testing data,substitutions/deviations,materials,and methods of construction,conformance statement,etc.) TYPE OF OBSERVATION: Stripping Inspection, Basement Demo, Heating Oil Tank Removal, Septic Tank Removal GeoPacific geologist Ben Cook onsite to observe site demolition, stripping, and preparation for structural fill materials.Currently the contractor has removed the existing homes, and in the process a septic tank was encountered for each. In addition, the north home contained a buried heating oil tank. The contractor is working with an environmental firm regarding proper removal of the septic and heating oil tank. It is my understanding that they were given the ok to backfill both septics, however the heating oil tank is only approved to backfill the lower half. The excavation areas and depths of each is approximately as follows: • Heating Oil Tank Removal, south side of northern house. Digout following removal of contaminated soil = 17'x17x16'. Exposed soils consist of stiff, moist, apparent native, brown SILT(ML). Some bluish remnant left, environmental firm conducting testing of sidewalls currently. • Septic at northern house, southwest corner of the house. Digout following removal =7'x6'x6'. Exposed soils consist of stiff, moist, apparent native, brown SILT(ML). • Septic at southern house, northwest corner of the house. Digout following removal =approximately 7'x6'x6'. Exposed soils consist of stiff, moist, apparent native, brown SILT(ML). The noted areas were cleaned of loose soil exposing competent apparent native soils, and appeared adequate for placement of backfill material. The contractor indicated that they can import either%"-0 or 1.5"-0 crushed aggregate to backfill, and I suggested either is fine, as long as there is no more than approximately 10% by weight passing the U.S. No. 200 sieve. While onsite the contractor was also preparing the rear parking lot subgrade for fill placement. Approximately two feet of engineered fill is needed to reach design subgrade elevation. The area was heavily vegetated and terraced, and had consisted of garden and back yard areas. The elevation was uneven at the time I arrived, but the contractor worked to scarify, aerate, moisture condition, level, and recompact the subgrade. A wet area was encountered on the northeastern corner of the parking lot where irrigation systems had been. Several French drain pipes, a 4 inch metal culvert, and haphazardly constructed drainage network of rounded gravel was encountered across the area. The contractor is removing the drains as encountered. Following bulk removal of organics and yard debris,the exposed soils consisted of apparent native, damp, medium stiff to stiff, SILT. I observed a dozer with a large rake ripping the existing subgrade on the order of 24 inches deep, and the contractor using a hose attached to a hydrant to spray down dry dirt, and blend to optimum moisture. The contractor needs the rest of the day to finish preparing and compacting the subgrade soils. In general site demolition and preparation is well under way. Debris has been stockpiled in the center of the site and is being loaded into trucks and removed. DISTRIBUTION LIST: OBSERVED BY: B.Cook Anders Otterlei,Anders.Otterlei u@hillarchitects.com Robert Leger, rlegeredci-engineers.com Geff Halle, GeffH(u�keywaycorp.com Ken Dykes, ken c(�.digdbec.com REVIEWED BY: J. Imbrie Doug Weeks, dougwa.digdbec.com GeoPacific Engineering, Inc. Signature Information contained herein pertains to materials tested/inspected only. The fact that any particular work has been observed or tested does not waive the contractor's responsibility for the means and methods of construction,job site safety,or to comply with the contract documents. This information contained herein should be considered preliminary until review by the project engineer. GeoPacific Engtneering,tnc. Real-World Geotechnical Solutions 14835 SW 72nd Avenue Tel (503) 598-8445 Investigation • Design •Construction Support Portland,Oregon 97224 Fax(503)941-9281 DAILY FIELD REPORT PROJECT DATE 72nd Avenue Apartments 9/19/2018 PROJECT NUMBER WEATHER 17-4626 Clear,70°F CLIENT CONTRACTOR Hill Architects DBEC PERMIT NUMBER PAGE# 1 of 2 Inspection Notes: (Include location,testing data,substitutions/deviations,materials,and methods of construction,conformance statement,etc.) TYPE OF OBSERVATION: Site Stripping, Engineered Fill Placement GeoPacific geologist Ben Cook onsite to observe continued removal of debris from the site, and placement of engineered fill in the eastern side parking area, as well as the southern portion of the building envelope. Upon arrival to the site the contractor had essentially removed the building and landscaping debris from the site and the central stockpile continued to be hauled off. It appeared that the areas surrounding the stockpile were adequately stripped. As mentioned yesterday, existing subgrade soils for the parking area were adequately prepared and the contractor began engineered fill placement. In addition,the contractor prepared subgrade where the site steps and terraces to the west, along the southeastern to south-central portion of the site which includes the driveway along the southern portion of the site, as well as the southern portion of the building. Exposed subgrade soils consisted of stiff, moist, SILT. The contractor scarified and recompacted the soils using a Dynapac front drum, vibratory, sheeps-foot compactor. Following recompaction of the existing subgrade a 12 inch lift of onsite SILT soil was placed across the eastern parking lot, and the southern portion of the building envelope. Following compaction of the initial lift nuclear density testing was conducted relative to 90%AASHTO T-180. Passing moisture and density test results were achieved at the locations tested and are reported on the Density Test Data Sheet dated 9/19/2018. DISTRIBUTION LIST: OBSERVED BY: B. Cook Anders Otterlei, Anders.Otterlei@hillarchitects.com Robert Leger, rleger(adci-engineers.com Geff Halle, GeffH(a�kevwaycorp.com REVIEWED BY: J. Imbrie Ken Dykes, ken(a�digdbec.com Doug Weeks, dougwa(�digdbec.com GeoPacific Engineering, Inc. Signature Information contained herein pertains to materials tested/inspected only. The fact that any particular work has been observed or tested does not waive the contractor's responsibility for the means and methods of construction,job site safety,or to comply with the contract documents. This information contained herein should be considered preliminary until review by the project engineer. GeoPacific Engineering,inc. Real-World Geotechnical Solutions • 14835 SW 72"d Avenue Tel (503) 598-8445 Investigation •Design •Construction Support Portland, Oregon 97224 Fax(503) 941-9281 AILY FIELD REPORT PROJECT DATE 72"d Avenue Apartments 9/18/2018 PROJECT NUMBER WEATHER 17-4626 Clear,70°F CLIENT CONTRACTOR Hill Architects DBEC PERMIT NUMBER PAGE# 1 of 2 Inspection Notes:(Include location,testing data,substitutions/deviations,materials,and methods of construction,conformance statement,etc.) TYPE OF OBSERVATION: Structural Backfill, Parking Area Subgrade Preparation GeoPacific geologist Ben Cook onsite to observe compaction of structural backfill in the septic and heating oil tank removal excavations, compaction and preparation of parking area subgrade in the eastern portion of the site, and general site demolition and preparation. The contractor is importing 1.5"-0 crushed aggregate from Tigard Sand and Gravel to backfill the septic and heating oil tank excavations. I collected a sample for a proctor and sieve tests. The sample will be submitted for AASHTO T-180. The contractor was filling the holes in 12-inch lifts, adding water with a hose, and using a diesel sled plate compactor attached to the end of an excavator to lower it in the hole and compact the aggregate. Because the heating oil and septic tank excavations were too deep to safely enter to conduct nuclear density testing, visual observations of compaction were conducted until the fill reached an elevation where I could safely enter, near approximately+4 feet on each septic. I observed 4 feet of aggregate visually compacted to a dense non-yielding condition which appeared adequate. Upon achieving testable elevations passing nuclear density test results were achieved relative to 95%AASHTO T-180. Both septic tanks were filled with 6 feet of crushed aggregate and brought to finish grade for those locations. The heating oil tank area was filled with approximately 6 feet of crushed aggregate, but the contractor needs to stop and wait for more environmental testing before continuing backfilling. There is approximately 6 more feet of fill to place for the heating oil tank excavation. While onsite the contractor completed moisture conditioning and recompacting the subgrade soils for the east side parking lot subgrade. The scarified and recompacted grade appeared to contain near optimum moisture and was compacted to a dense, non-yielding condition. Nuclear density testing was conducted relative to 90%AASHTO T-180 on the recompacted subgrade, and passing test results were achieved. The eastern parking lot area subgrade appears to have been adequately reworked and compacted, and is suitable for placement of engineered fill. Approximately two feet of onsite native engineered fill soil will be placed. The debris pile is continued to be hauled off but is currently occupying the central portion of the site. Following final removal of the pile is needed to open up the central portion of the site for continued grading. DISTRIBUTION LIST: OBSERVED BY: B. Cook Anders Otterlei, Anders.Otterlei(a.hillarchitects.com Robert Leger, rleoeraa..dci-engineers.corn Geff Halle, GeffH(a�kevwavcorp.com Ken Dykes, ken( .digdbec.com REVIEWED BY: J. Imbrie Doug Weeks, dougwCa.digdbec.com GeoPacific Engineering, Inc. Signature Information contained herein pertains to materials tested/inspected only. The fact that any particular work has been observed or tested does not waive the contractor's responsibility for the means and methods of construction,job site safety,or to comply with the contract documents. This information contained herein should be considered preliminary until review by the project engineer.