PHASE II LARAMIE MONITOR WELL PROJECT REPORT June 18, 2015 - - PowerPoint PPT Presentation

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PHASE II LARAMIE MONITOR WELL PROJECT REPORT June 18, 2015 Submitted to: City of Laramie P O Box C P.O. Box C Laramie, Wyoming 82073 Prepared by: Bern Hinckley, P.G. Chris Moody, P.G. Hinckley Consulting Wyoming Groundwater, LLC

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PHASE II – LARAMIE MONITOR WELL PROJECT REPORT

June 18, 2015

Submitted to: City of Laramie P O Box C P.O. Box C Laramie, Wyoming 82073 Prepared by: Bern Hinckley, P.G. Chris Moody, P.G. Hinckley Consulting Wyoming Groundwater, LLC P.O. Box 452 710 Garfield Street, Suite 211 Laramie, Wyoming 82073 Laramie, Wyoming 82070

North Well at Imperial Heights Park

This report is available at http://www.cityoflaramie.org/CivicAlerts.aspx Contact: Darren Parkin – Laramie Resources Manager – (307) 721-5213

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C i t y S p r i n g s F a u l t

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Quarry Anticline Quarry Fault Turner No. 2 LCCC MW #1 City Springs Sherman Hills Subdivision S h e r m a n H i l l s F a u l t Z

e y Fault Imperial Heights Subdivision Triangle Well Middle Borehole S th North Well Turner No. 1 LCCC MW #1 Honken Laramie Plains Subdivision City of Laramie South Well Honken Huntoon #1

Septic Systems (2008 CAPP) Potential Contamination Sources (2008 CAPP)

Location Map Laramie Monitor Well Project

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Turner Wellfield East Grand Ave. Pope Wellfield I-80

Groundwater Flow Schematic Laramie Monitor Well Project

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Casper Aquifer Protection Timeline

Late 1970s: U. Wyo. Geology Dept. Research Huntoon, Lundy, Thompson 1993: Wellhead Protection Plan (WWC) 2002: First Casper Aquifer Protection Plan (City/County EAC) 2008: Most recent CAPP update – City and County versions p y y 2009/2010: Well sampling 2013: East Laramie Wastewater Study 2008 ‐ 2014: 53 Site Specific Investigations (SSI)

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FINAL REPORT ISSUED APRIL 1, 2013

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No Impact Impacted Significant Impact

WWC Engineering, 2013

Unsafe

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Data collected from domestic wells by City of Laramie 2009, 2010

WWC Engineering, 2013

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Conclusion: “Risk to City Wells L ” ‐ Low”

Modified from WWC Engineering, 2013

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41T3

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41T1 41T2 LCCC MW #1 Turner No 1 Turner No. 2 Sherman Hills Fault Laprele #1 LAPCA-1 SHFCA-1 Triangle Well North Well Middle Borehole LCCC MW #1 Turner No. 1 Huntoon #1 Middle Borehole South Well

Monitoring Sites Laramie Monitor Well Project

Huntoon #2

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41T3

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41T1 41T2 LCCC MW #1 Turner No 1 Turner No. 2 Sherman Hills Fault Laprele #1 LAPCA-1 SHFCA-1 Triangle Well North Well Middle Borehole LCCC MW #1 Turner No. 1 Huntoon #1 Middle Borehole South Well

Monitoring Sites Laramie Monitor Well Project

Huntoon #2

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Casper Aquifer Schematic Cross-Section

W E

North Well Triangle

Sherman Hills Subdivision Imperial Heights Subdivision Laramie Plains Subdivision

Well

LCCC MW #1 Well

City Springs/ Turner No. 2 Well W a t e r L e v e l

G a m m a D e l t a E p s i l

S a t a n k a F

m a t i

Forelle Fm.

? ?

A l p h a B e t a G a m D

S a

Casper Aquifer

Casper Aquife

? ?

2.1 mi 1.8 mi 1.5 mi 1.2 mi 0.9 mi 0.6 mi 0.3 mi 0 mi 100 ft

Limestone Sandstone

fer

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Turner No 1 Turner No. 2 Sherman Hills Fault Triangle Well North Well Middle Borehole Turner No. 1 Middle Borehole South Well

Monitoring Sites Laramie Monitor Well Project

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Triangle Well

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Bedding-plane openings in Triangle Well

Down-hole images from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

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North Well

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Bedding-plane opening in North Well

Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

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Middle Borehole

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Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

Thin shale layer in Middle Borehole

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S th W ll South Well

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Down-hole image from Laramie Monitor Well Project - June, 2015 (vertical scale in feet)

Bedding-plane opening in South Well

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North Well 400 gpm SWL = 7322 ft. Middle Borehole (observation) SWL = 7323 ft. South Well (observation) SWL 7324 ft SWL = 7324 ft.

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400 gpm (2 days) North Well Middle Borehole South Well

static water level

6 ft.

2 ft.

19 ft.

fault zone

8.3

7.0 1 1

fault zone

1.1 2.3

Laramie Monitor Well Project - North Well Pump Test

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Quarry Anticline Elevation 7270 ft Elevation 7276 ft Turner No. 2 Elevation 7279 ft

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Quarry Fault Elevation 7304 ft Elevation 7287 ft Elevation 7267 ft Sherman Hills Fault Zone Elevation 7304 ft Ele ation 7322 ft Fault Zone Elevation 7322 ft Elevation 7323 ft Elevation 7324 ft Elevation 7329 ft

Groundwater Elevation Laramie Monitor Well Project

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Quarry Anticline Turner No. 2

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Quarry Fault Nitrate = 4 8 mg/l Nitrate = 3.1 mg/l Nitrate = 2.0 mg/l Sherman Hills Fault Zone Nitrate = 4.8 mg/l Nitrate 1 6 mg/l Fault Zone Nitrate = 9.4 mg/l Nitrate = 1.6 mg/l Nitrate = 7.0 mg/l Nitrate = 8.3 mg/l

Nitrate Concentrations Laramie Monitor Well Project

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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.

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Formations

Spur Wellfield

atanka/Forelle F

ater Formation

Casper Formation

Turner Wellfield

State of Wyoming

§ ¨ ¦

Chugwa

Pope Wellfield

Laramie Municipal Wells Laramie Monitor Wells Proposed Monitor Wells

Casper Aquifer Monitor Well Network

Wellfield Soldier #1