HomeMy WebLinkAboutPIT Test Data 10-19-2018Bradley Hoover HOBR1801-01
Project Address: Intersection of Hwys 19&20, NE PIT 1/TP10
Date:10/19/2018
Tester:Stephen Hanes Company:Northwestern Territories, Inc.
Phone:360-452-8491 Email:stephen@nti4u.com
Depth: 6.0 ft Bottom Width: 3 ft Bottom Length: 4 ft Bottom Area: 12 ft 2
Time Depth of Water (in.)
8:30 AM 1.0
9:30 AM 10.0
10:30 AM 10.5
11:30 AM 10.5
12:30 PM 10.5
1:30 PM 10.5
2:30 PM 10.0
Time Depth of Water (in.)Cumulative Vol.(ft3) Flow Rate (ft
3/hr)Infil. (in/hr)
2:30 PM 10.0 ---
2:45 PM 10.0 2.47 9.88 9.9
3:00 PM 10.0 1.76 7.04 7.0
3:15 PM 10.0 1.78 7.12 7.1
3:30 PM 10.0 1.76 7.04 7.0
Time Depth of Water (in.)Infil. (in/hr)
3:30 PM 10.0 -
3:45 PM 8.75 5.0
4:00 PM 7.5 5.0
4:15 PM 6.25 5.0
4:30 PM 5.0 5.0
Lowest steady-state infiltration rate:7.0 in/hr
Correction Factors (2014 SMMWM, Table III-3.3.1)
Site Variability:0.8
Test Method:0.5
Influent Control:0.9
Design Infiltration Rate:2.5 in/hr
Small PIT test, within the footprint of the proposed drainage trench near the southwest corner of the
property, approximately 100 ft north of the Uhaul property and 100 ft east of highway 20. After test,
hole was excavated to 7.5' depth. No groundwater was encountered.
Falling Head Period
Steady-state Period
Pre-soak Period
Pilot Infiltration Test