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HomeMy WebLinkAbout019 Appendix K - Groundwater Monitoringmemo Page 1 TO: James Nickelson, PE FROM: Breanne Cline, Environmental Scientist DATE: 04/28/2022 Updated 08/16/2022 and 10/27/2022 by JRN JOB NO.: 10130.001 RE: RE: West Park Groundwater Memo CC: Urgent For Review Please Comment Please Reply For Your Use The purpose of this memo is to document the expected groundwater conditions on the West Park Subdivision property (Norton East Ranch Sub Ph 6, Lot R1A – R1D) in Gallatin County, Montana. Groundwater Monitoring Wells A limited geo-investigation was performed on the subject property in March/April 2020 to determine the depth to gravels across the site. A total of 23 test holes were drilled at this time, and seven of the test holes have been used as groundwater monitoring locations since March 24, 2021. The depth to groundwater data tables and graphs for March 24, 2021 to March 30, 2022 are provided in Attachment 1. A map of groundwater monitoring locations is provided as Attachment 2. Monitoring is ongoing and the data will be further evaluated as the design for the project progresses. Across the seven monitoring wells, the depth to groundwater was generally at its shallowest in late May and ranged from 0.33 feet to 2.64 feet below ground surface. Groundwater was generally at its deepest level in late September/early October with groundwater levels between 1.69 feet and 3.54 feet below ground surface. With the limited data provided for the subject property, it appears groundwater levels fluctuate at or less than approximately two feet throughout the calendar year. Groundwater Degradation There are no identified steps to avoid groundwater degradation for the project. Groundwater resources will be protected through normal development routines and there are no identified project elements that will result in groundwater degradation. Such normal development routines include installing sanitary sewer systems, not installing garage floor drains connected to sumps, and following the design guidelines of the City of Bozeman and the adopted Building Codes. Conclusion The relatively shallow groundwater at the site will require that the design of the project take into account groundwater levels in terms of road, stormwater and building foundation design. 3/24/2021 4/7/2021 4/21/2021 5/6/2021 5/19/2021 6/2/2021 6/16/2021 7/1/2021 7/14/2021 7/28/2021 8/11/2021 8/25/2021 9/8/2021 9/22/2021 10/20/2021 11/17/2021 12/8/2021 1 TH-11 1.47 1.31 1.72 1.71 1.81 1.80 2.12 2.30 2.32 2.38 2.21 1.97 2.10 2.20 2.31 1.71 1.57 2 TH-14 0.37 0.37 0.90 0.98 1.04 1.02 1.32 1.52 1.55 1.67 1.55 1.37 1.37 1.53 1.55 1.01 0.67 3 TH-18 2.69 2.90 3.11 3.07 3.16 3.04 3.27 3.73 3.80 3.88 3.74 3.49 3.53 3.56 3.44 3.30 3.20 4 TH- 16 1.23 0.81 1.47 1.40 1.65 1.52 1.90 2.19 2.22 2.39 2.26 1.99 2.17 2.33 1.88 1.68 1.52 5 TH-4 0.65 0.31 0.98 1.07 1.33 1.28 1.77 2.09 2.13 2.28 2.02 1.71 1.89 2.13 - 1.46 0.82 6 TH-1 3.02 2.58 3.20 3.13 3.18 3.11 - - - - - - - - - - - 7 TH-8 1.17 1.01 1.57 1.53 1.73 1.75 2.18 2.45 2.43 2.54 2.26 1.95 2.19 2.46 2.73 1.73 1.55 All Measurements Shown on This Sheet are Water Depths Below Existing Ground In Feet. Cells marked with "-" notes that there was no water in the well. 0.36 -0.05 -0.26 -0.31 -0.65 -0.27 -0.13 -0.20 -0.070 -0.02 0.23 -0.17 -0.07 0.20 0.10 1.47 0.19 -0.15 -0.36 -0.35 -0.69 -0.24 -0.15 -0.17 -0.090 -0.05 0.16 -0.11 -0.02 0.14 0.02 0.15 0.66 0.03 -0.12 -0.18 -0.36 -0.40 -0.06 -0.43 -0.16 -0.060 0.06 0.26 -0.13 0.01 0.10 0.07 0.04 3.21 0.54 -0.15 -0.25 -0.41 -0.66 -0.32 -0.23 -0.06 -0.090 0.18 0.26 -0.05 -0.07 0.32 0.07 -0.02 1.54 0.42 -0.18 -0.40 -0.62 -1.00 -0.38 -0.21 -0.26 -0.110 0.10 0.32 -0.20 -0.07 0.09 0.07 0.78 0.57 -0.19 -0.21 -0.55 -0.66 0.39 -0.12 -0.26 -0.40 -0.65 -0.32 -0.20 -0.28 -0.050 -0.05 0.28 -0.09 -0.02 0.16 0.11 -0.04 1.50 0.36 -0.14 -0.27 -0.43 -0.67 -0.27 -0.23 -0.19 -0.08 0.04 0.25 -0.13 -0.04 0.18 0.08 0.03 1.53 Well Number Previous Label DATES OF MEASUREMENT (2021) WEST PARK SUBDIVISION MONITORING WELLS - 10130.001 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 2/23/2021 4/14/2021 6/3/2021 7/23/2021 9/11/2021 10/31/2021 12/20/2021 2/8/2022 Depth Below Ground (ft)DateNorton Ranch 2021 Ground Water Depth Below Ground Well 1 Well 2 Well 3 Well 4 Well 5 Well 6 Well 7 1/5/2022 1/19/2022 2/2/2022 2/10/2022 2/16/2022 2/23/2022 3/2/2022 3/9/2022 3/16/2022 3/23/2022 3/30/2022 1 TH-11 1.69 1.79 1.88 1.80 1.62 1.60 0.48 1.47 1.37 1.45 1.37 2 TH-14 1.05 1.04 1.30 1.05 0.83 0.91 0.06 0.68 0.53 0.63 0.57 3 TH-18 3.21 3.20 3.26 3.27 3.17 3.20 2.51 2.91 2.85 2.87 2.75 4 TH- 16 1.53 1.66 1.75 1.70 1.54 1.56 0.34 1.43 1.41 1.43 1.36 5 TH-4 1.04 1.21 1.49 1.39 1.17 1.24 0.14 0.89 0.79 1.14 1.07 6 TH-1 - - - - - - 2.46 3.12 3.32 - - 7 TH-8 1.76 1.91 2.09 2.0 1.81 1.87 0.39 1.39 1.35 1.45 1.39 -0.1 -0.1 0.1 0.2 0.0 1.1 -1.0 0.1 -0.1 0.1 0.0 -0.3 0.3 0.2 -0.1 0.9 -0.6 0.2 -0.1 0.1 0.0 -0.1 0.0 0.1 0.0 0.7 -0.4 0.1 0.0 0.1 -0.1 -0.1 0.0 0.2 0.0 1.2 -1.1 0.0 0.0 0.1 -0.2 -0.3 0.1 0.2 -0.1 1.1 -0.8 0.1 -0.4 0.1 -0.7 -0.2 -0.1 -0.2 0.1 0.2 -0.1 1.5 -1.0 0.0 -0.1 0.1 Average= -0.09 -0.16 0.09 0.18 -0.04 1.08 -0.79 0.04 -0.11 0.08 WEST PARK SUBDIVISION MONITORING WELLS - 10130.001 Well Number Previous Label DATES OF MEASUREMENT (measurements are ground water depth below ground elevation in feet) 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 12/30/2021 1/9/2022 1/19/2022 1/29/2022 2/8/2022 2/18/2022 2/28/2022 3/10/2022 3/20/2022 3/30/2022 4/9/2022 Depth Below Ground (ft)DateNorton Ranch 2022 Ground Water Depth Below Ground Elevation Well 1 Well 2 Well 3 Well 4 Well 5 Well 6 Well 7 © 2022 Microsoft Corporation © 2022 Maxar ©CNES (2022) Distribution Airbus DS © 2022 TomTom 4780.26 4787.34 4783.98 4785.78 4790.53 4793.07 4792.68 4785 4790 47 9 5 4785 4790 4795 4800 TRACT 1 11.85 acs. TRACT 2 6.79 acs. TRACT 3 12.30 acs. TRACT 4 10.04 acs. © PROJECT NO. FIGURE NUMBER COPYRIGHT MORRISON-MAIERLE,2022 N:\10130\001.02 Site Plan\ACAD\Civil\Worksheet\groundwater\10130.002 Groundwater Exhibit.dwg Plotted by rosie nickelson on Apr/11/2022 DRAWN BY: DSGN. BY: APPR. BY: DATE:engineers surveyors planners scientists MorrisonMaierle 2880 Technology Blvd West Bozeman, MT 59718 406.587.0721 www.m-m.net 10130.001 EX-B WEST PARK SUBDIVISION GROUNDWATER MONITORING WELL MAP BOZEMAN MONTANA BTB BTB JRN 4/1/2022 100 2000 SCALE IN FEET GROUNDWATER MON. WELL #5 (TH-4) GROUNDWATER MON. WELL #6 (TH-1) GROUNDWATER MON. WELL #4 (TH-16) GROUNDWATER MON. WELL #3 (TH-18) GROUNDWATER MON. WELL #2 (TH-14) GROUNDWATER MON. WELL #7 (TH-8)GROUNDWATER MON. WELL #1 (TH-11) GROUNDWATER ELEVATION FROM MARCH. 2, 2022 (TYP) EXISTING GROUND (TYP) EXISTING DETETION POND #4, NORTON PHASE 1 WETLANDS (TYP)