Agenda - Council - 12/14/2021 - Laserfiche WebLink

Home

3.2 Groundwater Groundwater was encountered in 10 of the 12 soil borings while drilling and sampling at depths ranging from about 7 1/2 to 19 1/2 feet below the ground surface corresponding to elevations ranging from about 863 to 881 1/2 feet above mean sea level. The observed water levels while drilling and sampling are summarized in Table 1. Table 1. Summary of Groundwater Levels Boring Measured Surface Approximate Depth Approximate Number Elevation (feet) to Groundwater Groundwater Elevation (feet)* (feet)* SB-1 884.3 18 8661/2 SB-2 903.2 NE - SB-3 889.1 91/2 8791/2 SB-4 892.4 10 8811/2 SB-5 888.3 121/2 876 SB-6 883.3 71/2 876 SB-7 882.6 191/2 863 SB-8 875.1 12 863 SB-9 888.5 71/2 881 SB-10 890.0 12 878 SB-11 902.5 NE - SB-12 885.7 141/2 871 =Depths and elevations were rounded to the nearest 1/2 foot. To further characterize groundwater conditions, piezometers were installed in borings SB-4, SB-6 and SB-10. Water levels were measured on august 4th,2021 and are summarized in Table 2. Table 2.Piezometer Water Level Summary Measured Elevation of Top pp Approximate Approximate Depth to Date Ground Surface of Piezometer Groundwater Elevation (feet) g(feet)CasinGroundwater Elevation (feet) (feet)* Boring(Piezometer SB-4 8/4/21 892.4 894.54 10.81 883.7 Borin iezometer SB-6 8/4/21 883.3 884.88 8.26 876.6 Borin iezometer SB-10 8/4/21 890.0 893.00 8.75 884.3 =Depth to groundwater was measured from top of the piezometer casing pipe. Groundwater levels and elevations were rounded to the nearest 0.1 foot. Water levels were measured on the dates as noted on the boring logs and in Table 2 the period of water level observations was relatively short. Seasonal and annual fluctuations in the groundwater levels should be expected. 4