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Geotechnical Letter 08-03-22 - Revision 2     Delta Oaks Group Project GEO22-13386-16 4904 Professional Ct ▪ Second Floor ▪ Raleigh ▪ NC ▪ 27609 919▪342▪8247 www.deltaoaksgroup.com Page 1 of 1    August 3, 2022 Lee W. Wright, P.E. Facilities Engineering Director Metronet Minneapolis , MN Geotechnical Letter-Revision 2 Site Information Chanhassen MN 1801 Lyman Boulevard Chanhassen (Carver County), Minnesota 55317 Latitude N 44° 50' 24.3” Longitude W 93° 34' 00.6” Dear Mr. Wright, Delta Oaks Group is pleased to provide this geotechnical letter for the above referenced site. This letter is an addendum to the geotechnical report prepared by Delta Oaks Group on April 6, 2021. This letter provides double ring infiltrometer infiltration test results for the proposed stormwater drainage areas shown in the Proposed Drainage Exhibit, prepared by Kimley Horn on June 17, 2022. Infiltration rates upon completion of each double ring infiltrometer test were: Test #1: 0.04 in/hr Test #2: 0.63 in/hr Test #3: 0.33 in/hr Delta Oaks Group appreciates the opportunity to be of service for this Geotechnical Letter. Please do not hesitate to contact Delta Oaks Group with any questions or should you require additional service on this project. Respectfully, Delta Oaks Group Joseph V. Borrelli, P.E. Executive Vice President - Partner Weather: Temp (A): Temp (G): Media:Date:7/28/2022 Test Date Start Time End Time: Technician: 1 Observed GWL: Test Equipment:Notes: Inside Ring Dia:30.5 cm 732.1 cm2 8.5 cm Outside Ring Dia:60.9 cm 2,166.4 cm2 17.0 cm 3,000 cm3 0.05 cm 81.1 Annular Tube Vol:10,000 cm3 0.1 cm 182.4 Increment Total Reading (cm)Flow (cm3)Flow (cm3)Inner (cm/hr) 1 12:00 0 0 23.50 0 0 67 2 12:15 15 15 22.86 51.5 0.0 67 0.28 3 12:30 15 30 22.48 82.4 69.5 67 0.23 4 12:45 15 45 22.48 82.4 69.5 67 0.15 5 13:00 15 60 22.10 113.3 139.0 67 0.15 6 13:30 30 90 21.72 144.2 208.5 69 0.13 7 14:00 30 120 21.34 175.1 278.0 69 0.12 8 14:30 30 150 20.96 206.0 463.3 69 0.11 9 15:00 30 180 20.55 239.0 556.0 69 0.11 10 15:30 30 210 20.32 257.5 625.4 69 0.10 11 16:00 30 240 19.94 288.4 741.3 69 0.10 12 13 14 15 16 17 18 17.272 0.09 16.891 0.08 16.256 0.09 19.177 0.06 18.796 0.06 17.78 0.09 19.939 0.06 19.939 0.04 19.558 0.06 Incremental Rate Reading (cm)Outer (cm/hr) 20.32 20.32 Trial #Start Time Elapsed Time (min)Inner Outer Water Temp (°F) Annular Area:Outer Ring Penetration: Inner Tube Vol:Inner Tube Graduation:Inner Tube Constant: Outer Tube Graduation:Outer Tube Constant: 1-DRI (Kit)Calibration Date:7/16/2022 Water Level Maintained:Mariotte Tubes Inner Ring Area:Inner Ring Penetration: Kilo Project #:22-1041 Sample Method:Hand Dug Pit R. Kaeppe Work Order #:Excavation Base Soils:Sandy Lean Clay, Brown, Moist N/A Project Address:1801 Lyman Blvd Sample Location:44.840589N, -93.566744W 12:00 Chanhassen, MN Sample Depth:1/2 feet below EGS 16:00 ASTM D3385-18 Tap Water (pH 6.8)MN PE# 52629 Project Name:Chanhassen DRI Sample Type:Stormwater Feature 7/21/2022 Field Testing Report Overcast, Calm Reviewed by:Double-Ring Infiltration Test 98° F 81° F Joseph M. Rozmiarek, PE Weather: Temp (A): Temp (G): Media:Date:7/28/2022 Test Date Start Time End Time: Technician: 1 Observed GWL: Test Equipment:Notes: Inside Ring Dia:30.5 cm 732.1 cm2 8.5 cm Outside Ring Dia:60.9 cm 2,166.4 cm2 17.0 cm 3,000 cm3 0.05 cm 81.1 Annular Tube Vol:10,000 cm3 0.1 cm 182.4 Increment Total Reading (cm)Flow (cm3)Flow (cm3)Inner (cm/hr) 1 8:30 0 0 74.30 0 0 65 2 8:35 5 5 69.22 412.0 463.3 65 6.75 3 8:40 5 10 62.23 978.5 694.9 65 8.02 4 8:45 5 15 59.06 1236.0 1158.2 67 6.75 5 8:50 5 20 56.52 1442.0 1274.1 67 5.91 6 8:55 5 25 53.98 1648.0 1389.9 67 5.40 7 9:00 5 30 52.71 1750.9 1737.4 68 4.78 8 9:05 5 35 48.90 2059.9 1737.4 68 4.82 9 9:10 5 40 46.36 2265.9 2200.7 68 4.64 10 9:15 5 45 45.09 2368.9 2432.3 68 4.31 11 9:20 5 50 43.18 2523.4 2432.3 68 4.14 12 9:25 5 55 41.91 2626.4 2779.8 68 3.91 13 9:30 5 60 40.01 2780.9 3011.4 68 3.80 14 9:45 15 75 35.56 3141.4 3474.7 69 3.43 15 10:00 15 90 34.93 3192.9 3648.5 69 2.91 16 10:15 15 105 34.29 3244.4 4053.8 69 2.53 17 10:30 15 120 27.94 3759.4 4285.5 70 2.57 18 11:30 60 180 26.67 3862.4 4401.3 70 1.76 19 12:30 60 240 16.51 4686.4 5327.9 70 1.60 29.21 0.68 24.13 0.61 33.3375 1.12 31.115 1.07 29.845 0.99 38.1 1.40 36.83 1.39 34.29 1.28 41.275 1.52 40.005 1.50 40.005 1.35 45.72 1.54 43.815 1.60 43.815 1.37 49.53 1.92 46.99 2.14 46.355 1.76 Incremental Rate Reading (cm)Outer (cm/hr) 53.34 50.8 2.57 Trial #Start Time Elapsed Time (min)Inner Outer Water Temp (°F) Annular Area:Outer Ring Penetration: Inner Tube Vol:Inner Tube Graduation:Inner Tube Constant: Outer Tube Graduation:Outer Tube Constant: 1-DRI (Kit)Calibration Date:7/16/2022 Water Level Maintained:Mariotte Tubes Inner Ring Area:Inner Ring Penetration: Kilo Project #:22-1041 Sample Method:Hand Dug Pit R. Kaeppe Work Order #:Excavation Base Soils:Clayey Sand, Brown, Moist N/A Project Address:1801 Lyman Blvd Sample Location:44.839776N, -93.566349W 8:30 Chanhassen, MN Sample Depth:1/2 feet below EGS 12:30 ASTM D3385-18 Tap Water (pH 6.8)MN PE# 52629 Project Name:Chanhassen DRI Sample Type:Stormwater Feature 7/22/2022 Field Testing Report Overcast, Calm Reviewed by:Double-Ring Infiltration Test 88° F 83° F Joseph M. Rozmiarek, PE Weather: Temp (A): Temp (G): Media:Date:7/28/2022 Test Date Start Time End Time: Technician: 1 Observed GWL: Test Equipment:Notes: Inside Ring Dia:30.5 cm 732.1 cm2 8.5 cm Outside Ring Dia:60.9 cm 2,166.4 cm2 17.0 cm 3,000 cm3 0.05 cm 81.1 Annular Tube Vol:10,000 cm3 0.1 cm 182.4 Increment Total Reading (cm)Flow (cm3)Flow (cm3)Inner (cm/hr) 1 2:00 0 0 34.29 0 0 70 2 2:15 15 15 31.12 257.5 579.1 70 1.41 3 2:30 15 30 28.58 463.5 1111.9 70 1.27 4 2:45 15 45 26.80 607.7 1436.2 71 1.11 5 3:00 15 60 24.38 803.4 1922.7 71 1.10 6 3:15 15 75 22.23 978.5 2409.1 71 1.07 7 3:30 15 90 19.30 1215.4 2779.8 71 1.11 8 3:45 15 105 17.40 1369.9 3219.9 71 1.07 9 4:00 15 120 15.49 1524.4 3521.0 71 1.04 10 4:30 30 150 12.70 1750.9 3891.7 72 0.96 11 5:00 30 180 9.91 1977.5 4410.6 72 0.90 12 5:30 30 210 5.72 2317.4 5327.9 72 0.90 13 6:00 30 240 3.56 2492.5 6069.2 72 0.85 14 15 16 17 18 43.815 40.64 37.719 35.941 33.274 30.607 0.86 0.85 0.81 0.72 1-DRI (Kit) Inner 28.575 26.162 24.511 22.479 19.6342 14.605 10.541 0.68 0.70 0.70 1.07 1.03 0.88 0.89 0.89 Inner Tube Vol: Reading (cm) Outer Water Temp (°F)Start TimeTrial # Inner Tube Constant: Outer Tube Constant: Inner Ring Penetration: Outer Ring Penetration: Outer (cm/hr) Incremental RateElapsed Time (min) Inner Ring Area: Annular Area: Inner Tube Graduation: Outer Tube Graduation: Reviewed by: 1801 Lyman Blvd 44.839946N, -93.566713W Project Name: Project Address: Kilo Project #: Work Order #: Chanhassen, MN 22-1041 Field Testing Report Double-Ring Infiltration Test ASTM D3385-18 Sample Type: Sample Location: Chanhassen DRI Stormwater Feature 7/22/2022 Sample Depth: Sample Method: 2:00 Overcast, Calm Tap Water (pH 6.8) 7/16/2022 MN PE# 52629 Sandy Lean Clay, Brown, Moist N/A 1/2 feet below EGS 6:00 Hand Dug Pit R. Kaeppe Joseph M. Rozmiarek, PE84° F 98° F Mariotte TubesWater Level Maintained: Excavation Base Soils: Calibration Date: 0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 0 30 60 90 120 150 180 210 240Infiltration Rate (cm/hr)Elapsed time (min) Double Ring Infiltration Test Results (cm/hr) Test #1 - North Test #2 - South Test #3 - Center 0 0.5 1 1.5 2 2.5 3 3.5 0 30 60 90 120 150 180 210 240Infiltration Rate (in/hr)Elapsed time (min) Double Ring Infiltration Test Results (in/hr) Test #1 - North Test #2 - South Test #3 - Center Project Name:Double Ring Infiltration Testing Proposed Testing Location Plan Project Address:1801 Lyman Boulevard City, State:Chanhassen, Minnesota Project Number:22-1041 N T-1 T-3 T-2 22-1041 Project Name:Double Ring Infiltration Testing Proposed Testing Location Plan Project Address:1801 Lyman Boulevard City, State:Chanhassen, Minnesota Project Number: N T-2 T-3 T-1