PHASE II LARAMIE MONITOR WELL PROJECT REPORT

Transcription

1 PHASE II LARAMIE MONITOR WELL PROJECT REPORT June 18, 2015 Submitted to: City of Laramie P.O. Box C Laramie, Wyoming Prepared by: Bern Hinckley, P.G. Chris Moody, P.G. Hinckley Consulting Wyoming Groundwater, LLC P.O. Box Garfield Street, Suite 211 Laramie, Wyoming Laramie, Wyoming North Well at Imperial Heights Park This report is available at Contact: Darren Parkin Laramie Resources Manager (307)

2

3

4

5 City Sprin Turner No. 2 ^_ ^_ City Springs Quarry Anticline Quarry Fault Imperial Heights Triangle Well Subdivision North Middle Borehole Well Sherman Hills Subdivision Honken Huntoon #1 Turner No. 1 LCCC MW #1 Sherman Hills Fault Zone South Well City of Laramie Laramie Plains Subdivision Septic Systems (2008 CAPP) Potential Contamination Sources (2008 CAPP) Location Map Laramie Monitor Well Project

6 Groundwater Flow Schematic Laramie Monitor Well Project Turner Wellfield ^_^_ East Grand Ave. I-80 Pope Wellfield

7 Casper Aquifer Protection Timeline Late 1970s: U. Wyo. Geology Dept. Research Huntoon, Lundy, Thompson 1993: Wellhead Protection Plan 2002: First Casper Aquifer Protection Plan (City/County EAC) 2008: Most recent CAPP update City and County versions 2009/2010: Well sampling by City 2013: East Laramie Wastewater Study : 53 Site Specific Investigations

8

9 FINAL REPORT ISSUED APRIL 1, 2013

10 No Impact Impacted Significant Impact Unsafe WWC Engineering, 2013

11 Data collected from domestic wells by City of Laramie 2009, 2010 WWC Engineering, 2013

12 Conclusion: Risk to City Wells - Low Modified from WWC Engineering, 2013

13

14 Line of section

15 Casper Aquifer Schematic Cross-Section W E Laramie Plains Subdivision Imperial Heights Subdivision Sherman Hills Subdivision North Well Forelle Fm. City Springs/ Turner No. 2 Well LCCC MW #1 Well Satanka Formation? Epsilon Delta Casper Aquifer Triangle Well Water Level Gamma Beta? Alpha? 100 ft? Casper Aquifer Sandstone Limestone 0 mi 0.3 mi 0.6 mi 0.9 mi 1.2 mi 1.5 mi 1.8 mi 2.1 mi

16 ^_ ^_ Turner No. 1 Turner No. 2 Sherman Hills Fault Triangle Well North Well Middle Borehole South Well Monitoring Sites Laramie Monitor Well Project

17 Ps Triangle Well

18

19 Bedding-plane openings in Triangle Well Down-hole images from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

20 North Well

21

22 Bedding-plane opening in North Well Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

23 Middle Borehole

24

25 Thin shale layer in Middle Borehole Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

26 South Well

27

28 Bedding-plane opening in South Well Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

29

30 Laramie Monitor Well Project - North Well Pump Test North Well 400 gpm (2 days) Middle Borehole South Well 6 ft. static water level 2 ft. 19 ft fault zone

31 ^_ Turner No. 2 Elevation 7270 ft Quarry Anticline Elevation 7276 ft ^_ Elevation 7267 ft Elevation 7279 ft Quarry Fault Elevation 7287 ft Elevation 7304 ft Sherman Hills Fault Zone Elevation 7322 ft Elevation 7323 ft Elevation 7324 ft Elevation 7329 ft Groundwater Elevation Laramie Monitor Well Project

32

33

34 Conclusions Residential activity in the East Grand subdivisions has impacted groundwater quality at Imperial Heights Park. The Sherman Hills Fault zone is not a barrier to groundwater flow. A portion of the discharge of City Springs and the Turner Wellfield is impacted by the East Grand subdivisions. Within this general picture, the details of groundwater flow and quality are complex. Groundwater level and quality monitoring should continue at available locations.

35 Spur Wellfield Turner Wellfield Casper Formation State of Wyoming Pope Wellfield 80 Soldier #1 Laramie Municipal Wells Laramie Monitor Wells Proposed Monitor Wells Casper Aquifer Monitor Well Network

36

37 41T3 LAPCA-1 Laprele #1 Turner No. 2 41T1 ^_ ^_ 41T2 Turner No. 1 LCCC MW #1 Triangle Well SHFCA-1 Sherman Hills Fault North Well Huntoon #1 Middle Borehole South Well Huntoon #2 Monitoring Sites Laramie Monitor Well Project

38 ^_ Turner No. 2 Quarry Anticline ^_ Nitrate = 2.0 mg/l Quarry Fault Nitrate = 3.1 mg/l Nitrate = 4.8 mg/l Sherman Hills Fault Zone Nitrate = 1.6 mg/l Nitrate = 9.4 mg/l Nitrate = 8.3 mg/l Nitrate = 7.0 mg/l Nitrate Concentrations Laramie Monitor Well Project

39 ^_ Turner No. 2 Quarry Anticline ^_ Nitrate = 2.0 mg/l Quarry Fault Nitrate = 3.1 mg/l Nitrate = 4.8 mg/l Sherman Hills Fault Zone Nitrate = 1.6 mg/l Nitrate = 9.4 mg/l Nitrate = 8.3 mg/l Nitrate = 7.0 mg/l Nitrate Concentrations Laramie Monitor Well Project