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Phase I Hydrogeologic
Characterization Mamm Creek



URS completed the Phase I Hydrogeologic Characterization under contract with the Garfield County Board of County Commissioners and published the final report in March 2006. The project area is approximately 110 square miles in size and is located south of the cities of Rifle and Silt in western Colorado. The scope of work for the hydrogeologic characterization was developed by Garfield County, the Colorado Oil and Gas Conservation Commission (COGCC), the Grand Valley Citizens Alliance, and the Western Colorado Congress. The primary objectives of the study are to address vulnerability of surface water and groundwater resources in the area to impacts from gas well development and other human activities, and to evaluate if a relationship exists between water quality variations and lithology type (i.e. sandstone, mudstone, or alluvium). The study area comprises the majority of the Mamm Creek gas field in the southeastern portion of the Piceance Basin.

Master Document:

Phase I Hydrogeologic Characterization Mamm Creek Document (pdf file)

Figures
(all links below are downloadable pdf files)

Figure 1-1 Study Area Boundaries
Figure 2-1 Location of Study Area Within Piceance Basin
Figure 2-2 Stratigraphic Column
Figure 2-3 Site Geology Map and Cross-Section Locations
Figure 2-4 Cross-section A-A
Figure 2-5 Cross-section B-B
Figure 2-6 Cross-section C-C
Figure 2-7 Isopach Map of the Wasatch Formation
Figure 2-8 Outcrop Measured Section Locations
Figure 2-9 Legend of Symbols for Measured Sections
Figure 2-9a Davis Point Measured Section and Photomosaic
Figure 2-9b Divide Creek Measured Section and Photomosaic
Figure 2-9c Dry Hollow Measured Section and Photomosaic
Figure 2-9d Mamm Creek Measured Section and Photomosaic
Figure 2-9e Power Plant Measured Section and Photomosaic
Figure 2-10 Geologic Structures
Figure 2-11 Divide Creek Anticline Structures
Figure 2-12 Lineaments and Geologic Structures
Figure 3-1 Water Well Locations
Figure 3-2 Histogram of Total Depths for Alluvial and Bedrock Wells
Figure 3-3 Histogram of Specific Capacity for Alluvial and Bedrock Wells
Figure 3-4 Specific Capacity versus Total Depth - Wasatch Wells
Figure 3-5 Specific Capacity Map of Wasatch and Alluvial Wells
Figure 3-6 Potentiometric Surface Map for the Wasatch Formation Aquifer
Figure 4-1 Drilling Activity by the Eight Most Active Operators in the Area
Figure 4-2 Drilling Activity in the Area from 1959 to September 2005
Figure 4-3 Locations of Gas Wells
Figure 4-4 Histogram of Surface Casing Depths
Figure 4-5 Gas Well Bradenhead Pressures 2004 and 2005
Figure 4-6 Locations of Production Pits, Older Wells, Abandoned and Shut-In Wells, and Shallow Surface Casings
Figure 4-7 Cumulative Production of Water for Gas Wells (Conventional and CBM Wells)
Figure 5-1 Distinguishing Biogenic from Thermogenic Gas by Using Alkane Ratios
Figure 5-2 Use of C and H isotopes to Distinguish Biogenic from Thermogenic Gases
Figure 5-3 Identification of the Source of Hydrocarbon Gases
Figure 5-4 Locations of Wells Selected for Interpreting Major Ion Chemistry
Figure 5-5 Groundwater Type by Mean TDS
Figure 5-6 Distribution of Water-Types Observed in Groundwater
Figure 5-7 Scatterplot of Sulfate over Bicarbonate versus Chloride
Figure 5-8 Linear Regression of Calculated versus Measured TDS
Figure 5-9 Dendrogram of Groundwater Major Ions
Figure 5-10 PCA Scree Plot for Groundwater Major Ions
Figure 5-11 Graduated Symbol Map of Field-Measured pH in Groundwater
Figure 5-12 Graduated Symbol Map of Sulfate to Bicarbonate Ratios in Groundwater
Figure 5-13 Graduated Symbol Map of Sulfate Concentrations in Groundwater
Figure 5-14 Graduated Symbol Map of Measured TDS in Groundwater
Figure 5-15 Graduated Symbol Map of Chloride to Bromide Ratios in Groundwater
Figure 5-16 Graduated Symbol Map of Nitrite to Nitrate Ratios (meqs) in Groundwater
Figure 5-17 Graduated Symbol Map of Nitrate Ion Concentrations in Groundwater
Figure 5-18 Graduated Symbol Map of Nitrite Ion Concentrations in Groundwater
Figure 5-19 Graduated Symbol Map of Fluoride Concentrations in Groundwater
Figure 5-20 Graduated Symbol Map of Selenium Concentrations in Groundwater
Figure 5-21 Graduated Pie Chart Symbol Map of Cations and Anions in Groundwater
Figure 5-22 Chart of Cation and Anion Concentrations and Water Well Depth
Figure 5-23 Graduated Symbol Map of Methane Concentrations Greater Than 1 mg/L in Domestic Water Wells
Figure 5-24 1997 Methane Concentrations and Gas Drilling Activity
Figure 5-25 1999 Methane Concentrations and Gas Drilling Activity
Figure 5-26 2001 Methane Concentrations and Gas Drilling Activity
Figure 5-27 2002 Methane Concentrations and Gas Drilling Activity
Figure 5-28 2003 Methane Concentrations and Gas Drilling Activity
Figure 5-29 2004 Methane Concentrations and Gas Drilling Activity
Figure 5-30 2005 Methane Concentrations and Gas Drilling Activity
Figure 5-31 Carbon and Hydrogen Stable Isotope Ratios in Groundwater
Figure 5-32 Plot of Hardness versus Calculated TDS in Groundwater
Figure 5-33 Classification of Irrigation Water by Using SAR and Conductivity
Figure 5-34 Stiff Plots of Groundwater Quality in the Shire Member
Figure 5-35 Schoeller Plot of Na-HCO3 Groundwater in the Shire Member
Figure 5-36 Stiff Plots of Groundwater Quality in the Molina-like Sandstone Unit
Figure 5-37 Stiff Plots of Groundwater Quality in the Atwell Gulch Member
Figure 5-38 Piper Plot of Atwell Gulch Groundwater
Figure 5-39 Stiff Plots of Alluvial Groundwater Quality
Figure 5-40 Location Map of Sampling Sites Selected for Interpreting Surface Water Major Ion Chemistry
Figure 5-41 Surface Water Types by Mean TDS
Figure 5-42 Distribution of Water-Types Observed in Surface Waters
Figure 5-43 Stiff Plots of Surface Water Quality
Figure 5-44 Measured versus Calculated TDS in Surface Water
Figure 5-45 Dendrogram of Major Ions in Surface Water
Figure 5-46 PCA Scree Plot for Major Ions in Surface Water
Figure 5-47 Graduated Symbol Maps of pH in Surface Waters
Figure 5-48 Graduated Symbol Maps of Fluoride Concentrations in Surface Waters
Figure 5-49 Graduated Symbol Maps of Nitrate Concentrations in Surface Water
Figure 5-50 Graduated Symbol Map of Selenium Concentrations in Surface Water
Figure 5-51 Graduated Symbol Map of Arsenic Concentrations in Unfiltered Surface Water
Figure 5-52 Methane C and H Isotopes in Surface Water
Figure 5-53 Quantile Plot of Hardness in Surface Water
Figure 5-54 Piper Diagram of Spring Water Chemistry
Figure 5-55 Schoeller Plot of Spring Waters
Figure 5-56 Schoeller Plot of Surface Water from Streams
Figure 5-57 Schoeller Plot of Surface Water from Ponds
Figure 5-58 Stiff Diagrams for USGS Creek Samples
Figure 5-59 Stiff Diagrams for Select Surface Water Samples
Figure 5-60 Stiff Diagrams for Select Wasatch Water Wells
Figure 5-61 Stiff Diagrams for Select Produced Water Samples
Figure 5-62 Piper Plot for Produced Water, Groundwater, and Surface Water Samples
Appendix A

resources
 
 
Garfield County Community Development Department
Oil and Gas Division
0375 County Road 352, Building 2060
Rifle, CO 81650


Kirby Wynn,
Oil & Gas Liaison
970-625-5905 | office
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  Gretchenn DuBois, Administrative Assistant
970-625-5915 | phone
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  Fred Jarman,
Director of Garfield County Community Development
970-945-8212 | phone
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