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Percolation Test Irerracon Paradiso Property Stockton, California October 8, 2020 Terracon Project No. NA207072 Boring Depth Soil Type Unified Soil Latitude Longitude Interval(ft) Classification 10.0- 12.0 Sandy silt with clay, moist, brown,fine ML 12.0- 15.5 Silty sand, moist, brown,fine SM 15.5- 16.0 Silty sand with clay, moist, brown,fine SM 16.0- 17.0 Sandy silt with gravel, reddish brown, ML medium to large 17.0- 19.0 Lean clay with gravel, moist, reddish brown CL 19.0-25.0 Lean clay with gravel and silt, moist, CL reddish brown On September 28, 2020, the borings were presaturated with up to 12 inches of clear water over gravel. On September 29, 2020, water remained in boring 131 (3.5 feet bgs) and boring B2 (13 feet bgs)was found to be dry and intact. A water level reading could not be measured from boring B3 (25 feet bgs)due to a muddy layer at the bottom of the boring. Approximately 0.5 feet of water was added over gravel to boring 131 and the boring was monitored over a 4 hour period until a final 30 minute reading could be witnessed by the EHD. Approximately two feet of water was inadvertently added to boring B2 and the drop in water level was recorded every 30 minutes over a four hour period. Approximately 2.5 feet of water was added to boring B3 to bring the water level above the muddy bottom, and the drop in water level was recorded every 30 minutes over a four hour period. The tests were observed by EHD representative Ms. Daria Afonskaia who signed the percolation test form. The following table is a summary of the percolation test rates: Table 2 Summary of Percolation Test Test No. Percolation Test Percolation Rate Test Duration Comments Date Tested Depth (feet) (min/in) (hours) 131 3.5 0 30 Unsatisfactory 10-29-20 Percolation Rate Responsive ■ Resourceful ■ Reliable 3