Office of the Massachusetts State Geologist Fracture … · OMSG Geologic Map No. 06-02.1, Sheet 5...
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EXPLANATION OF SYMBOLS FAULTS Trace of discrete shear zone or sheared contact. Queried in Nashoba terrane where relations to Andover granite are unknown. Zone of sheared and cataclastic rocks (e.g. Photo 16) Trace of brittle fault. Only the traces of faults that can be supported by unequivocal field evidence are shown. Approx. southe rn limit of du ctile deformation and brittle faults associated with Bloody Bluff Fault Zone Approx. northern limit of major brittle faults associated with Bloody Bluff Fault Zone BLOODY BLUFF FAULT ZONE BLOODY BLUFF / LAKE CHAR FAULT SPENCER BROOK FAULT ZONE ASSABET RIVER FAULT ZONE Zone of closely-spaced major brittle faults and mylonite exposed in Metrowest Tunnel Approx. southe rn limit of du ctile deformation and brittle faults associated with Bloody Bluff Fault Zone Approx. northern limit of major brittle faults associated with Bloody Bluff Fault Zone BLOODY BLUFF FAULT ZONE BLOODY BLUFF / LAKE CHAR FAULT SPENCER BROOK FAULT ZONE ASSABET RIVER FAULT ZONE Zone of closely-spaced major brittle faults and mylonite exposed in Metrowest Tunnel OMSG Geologic Map No. 06-02.1, Sheet 5 Appendix D: Water Resources Marlborough Quadrangle 2006 (revised 2007) This research was supported by U.S. Geological Survey, National Cooperative Geologic Mapping Program, under assistance Award No. 03HQAG0067 and an NSF REU Grant to the Association of American State Geologists. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government, the Commonwealth of Massachusetts, or the University of Massachusetts. Citation: Mabee, S.B. and S. Salamoff, 2006, Fracture characterization map of the Marlborough quadrangle, Office of the Massachusetts State Geologist Geologic Map 06-02. Scale 1:24,000. 5 sheets and digital product: Adobe PDF and ESRI ArcGIS database. A digital copy of this map, including GIS datalayers, is available at http://www.geo.umass.edu/stategeologist. Additional paper copies can also be obtained from the Office of the State Geologist for a small fee. Author Affiliations: 1 Corresponding Author: Office of the Massachusetts State Geologist E-mail: [email protected] Fracture Characterization Map of the Marlborough Quadrangle, Massachusetts: Appendix D: Water Resources (sheet 5 of 5) by Stephen B. Mabee 1 and Scott A. Salamoff O F F I C E O F T H E S T A T E G E O L O G I S T U N I V E R S I T Y O F M A S S A C H U S E T T S Office of the Massachusetts State Geologist University of Massachusetts, Amherst Address: 269 Morrill Science Center, 611 North Pleasant Street, Amherst, MA 01003 Phone: 413-545-4814 E-mail: [email protected] WWW: http://www.geo.umass.edu/stategeologist MHD Highway MHD Bridge GWSI WCR BWSC Westboro P rivate MWRA PWS Wells Data Sources Limit of Data T opography 75 meters 175 1:72,000 S cale 0 4 2 km 0 2 Miles Measured Depth 0 - 3 3 - 6 6 - 9 9 - 12 12 - 15 > 15 meters 3 6 9 15 12 18 6 6 6 9 3 1 2 1 2 3 3 3 1 2 3 15 1 5 3 9 12 12 15 6 9 9 3 9 6 6 6 12 18 15 6 12 3 3 6 3 6 9 3 3 1 8 9 9 6 3 9 6 3 B edrock Depth C ontours (3m interval) S hallow/outcrops Limit of Data T opography 75 meters 175 1:72,000 S cale 0 4 2 km 0 2 Miles 90 90 75 75 105 105 120 120 135 135 60 60 135 135 75 75 75 75 105 105 60 60 120 120 75 75 90 90 105 105 120 120 105 105 90 90 75 75 90 90 90 90 90 90 90 90 90 90 75 75 90 90 75 75 90 90 90 90 75 75 B edrock S urface E levation Bedrock Wells Bedrock E levation (15 meter contours) Limit of Data (meters a.s.l.) 1:72,000 S cale 0 4 2 km 0 2 Miles Depth to water 0 - 3 3 - 6 6 - 9 9 - 12 > 12 meters 90 75 105 60 120 135 75 7 5 105 75 1 2 0 3 6 9 1 2 6 6 9 9 3 3 6 6 9 6 Subsurface Water Level Water surface elevation (m) Depth to water (m) Limit of Data T opography 75 meters 175 1:72,000 S cale 0 4 2 km 0 2 Miles Yield_GPM 0 - 5 5 - 10 10 - 20 20 - 50 > 50 GPM Well Yields T opography 75 meters 175 1:72,000 S cale 0 4 2 km 0 2 Miles Location of permeable overburden Figure D6. Map of the extent of permeable overburden. Shaded region shows the areas where surface materials are permeable or have a high hydraulic conductivity. The high capacity to store water in these areas may provide a source of recharge to underlying bedrock. Unshaded areas are less permeable (low hydraulic conductivity) and consist predominantly of glacial till and occasional bedrock exposures. Surficial materials shown on the map modified from a data layer compiled by Byron Stone (1992) at 1:125,000. This data layer is available from MassGIS. Extent of sulfide mineralization Figure D7. Map showing the extent of sulfide mineralization observed in outcrops. Most common minerals observed are pyrite and chalcopyrite. Sulfide mineralization may have an influence on groundwater quality in localized areas. Outcrops where fracture measurements were taken Bedrock Exposure MASS. QUANDRANGLE LOCATION DISCUSSION This sheet summarizes basic data related to the water resources in the quadrangle. These basic data include: 1) a map showing the location of wells used to generate groundwater contour and well yield distribution maps (Figure D1), 2) a depth to bedrock map that shows the general distribution of overburden thickness (Figure D2), 3) a generalized contour map of the bedrock surface (Figure D3), 4) a map indicating the general direction of groundwater flow in the bedrock and the depth to the water table in bedrock wells (Figure D4), 5) a map showing the distribution of yields in bedrock wells (Figure D5), 6) a map delineating the extent of permeable surface materials overlying the bedrock (Figure D6), and, 7) a map depicting the location of sulfide mineralization observed in bedrock outcrops (Figure D7). Well data were collected from eight sources; each source contained different attributes and spatial referencing. Some data had no coordinate information or elevation data. These wells were located using parcel data provided by MassGIS and elevations were interpolated from the digital terrain model. Every effort was made to standardize the data sets into a consistent format. However, inconsistencies do exist. All contoured data shown on the maps were machine contoured using kriging, inverse distance squared weighting or other interpolation techniques. No adjustments were made to the water level and contour data for seasonality, the year of well construction or topography. Data points from which the contours were produced are plotted, where feasible, to show the spatial variability in the data set. Accordingly, these maps should be used with caution and should not be a substitute for site-specific data. Greater spatial variability is expected at more local scales. However, the maps do provide a reasonable depiction of general patterns across the region and can be used as a regional framework. Figure D1. Map of well locations in the Marlborough quadrangle. Well data were collected from eight different sources and assembled into a well data base. The well data sources include monitoring wells from the MA Department of Environmental Protection Bureau of Waste Site Cleanup (BWSC), the Massachusetts Water Resources Authority soil borings (MWRA), bridge and highway boring logs from the Massachusetts Highway Department (MHD Bridge and MHD Highway), the U.S. Geological Survey GWSI data base (GWSI), and well completion reports from the MA Department of Conservation and Recreation (Westboro Private and WCR). The entire data set comprises 1813 wells. Limit of well data extends 500 m beyond the edge of the quadrangle. Data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters. Figure D2. Generalized map of the depth to bedrock. Contours are drawn at 3 m intervals. Data points from which the generalized contours were produced are shown as open black circles and indicate the spatial variability in the depth to bedrock data. A total of 798 wells and 534 outcrop locations were used to construct the map. The contours show only a generalized depth to bedrock map over the region and should be used with caution when examining specific sites. Greater spatial variability is expected at larger scales. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters. Figure D3. Generalized contour map of the bedrock surface. Contours are drawn at 15 m intervals. Contours were generated by subtracting the interpolated depth to bedrock surface produced in Figure D2 from topography. Data points used in this analysis are shown as black dots and include a total of 798 wells and 534 outcrop locations. The contours show only a generalized bedrock surface over the region and should be used with caution when examining specific sites. Greater spatial variability is expected at larger scales. All elevations are in meters above sea level. Figure D4. Generalized map showing the static groundwater elevations and depth to groundwater of bedrock wells. This map does not include water level information from overburden wells. Contour intervals for the groundwater elevations are 15 m and the intervals for the depth to groundwater are 3 m. Data points from which the generalized contours of depth to groundwater and groundwater elevation were produced are shown as open black circles. The various sizes of the circles indicate the spatial variability in the depth to groundwater data. A total of 546 wells were used to construct the contours. The contours show only generalized water level information over the region and should be used only for examining the general pattern of groundwater flow in the bedrock. No adjustments were made to water level data for seasonal variation or for the year of well construction. In addition, no adjustments were made to the groundwater contours for local variability in surface topography. Accordingly, there are areas where generalized groundwater contours appear above local topography. These areas are shown by dashed lines on the map. Caution is advised when examining specific sites. Greater spatial variability is expected at local scales. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters. Figure D5. Generalized map showing the distribution of well yields in bedrock wells. No overburden wells are shown on this map. Yield is expressed in gallons per minute (gpm). A total of 318 wells were used to construct this map. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters.
Transcript of Office of the Massachusetts State Geologist Fracture … · OMSG Geologic Map No. 06-02.1, Sheet 5...
EXPLANATION OF SYMBOLS
FAULTS
Trace of discrete shear zone or sheared contact. Queried in Nashoba terrane where relations to Andover granite are unknown.
Zone of sheared and cataclastic rocks (e.g. Photo 16)
Trace of brittle fault. Only the traces of faults that can be supported by unequivocal field evidence are shown.
Approx. southern limit of ductile deformation and brittle faults associated with Bloody Bluff Fault Zone
Approx. northern limit of major brittle
faults associated with Bloody Bluff Fault Zone
BLOODY BLUFF FAULT ZONE
BLOODY BLUFF / LAKE CHAR FAULT
SPENCER BROOK FAULT ZONE
ASSABET RIVER FAULT ZONE
Zone of closely-spaced major brittle faultsand mylonite exposed in Metrowest Tunnel
Approx. southern limit of ductile deformation and brittle faults associated with Bloody Bluff Fault Zone
Approx. northern limit of major brittle
faults associated with Bloody Bluff Fault Zone
BLOODY BLUFF FAULT ZONE
BLOODY BLUFF / LAKE CHAR FAULT
SPENCER BROOK FAULT ZONE
ASSABET RIVER FAULT ZONE
Zone of closely-spaced major brittle faultsand mylonite exposed in Metrowest Tunnel
OMSG Geologic Map No. 06-02.1, Sheet 5Appendix D: Water Resources
Marlborough Quadrangle2006 (revised 2007)
This research was supported by U.S. Geological Survey, National Cooperative Geologic Mapping Program, under assistance Award No. 03HQAG0067 and an NSF REU Grant to the Association of American State Geologists. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Government, the Commonwealth of Massachusetts, or the University of Massachusetts.
Citation:Mabee, S.B. and S. Salamoff, 2006, Fracture characterization map of the Marlborough quadrangle, Office of the Massachusetts State Geologist Geologic Map 06-02. Scale 1:24,000. 5 sheets and digital product: Adobe PDF and ESRI ArcGIS database.
A digital copy of this map, including GIS datalayers, is available at http://www.geo.umass.edu/stategeologist. Additional paper copies can also be obtained from the Office of the State Geologist for a small fee.
Author Affiliations: 1Corresponding Author: Office of the Massachusetts State Geologist E-mail: [email protected]
Fracture Characterization Map of the Marlborough Quadrangle, Massachusetts:Appendix D: Water Resources (sheet 5 of 5)
by Stephen B. Mabee1 and Scott A. Salamoff
OFF
ICE O
F THE STATE GEOLOGIST
UN
IVERS ITY OF MAS SACHUSETTS
Office of the Massachusetts State GeologistUniversity of Massachusetts, AmherstAddress: 269 Morrill Science Center, 611 North Pleasant Street, Amherst, MA 01003Phone: 413-545-4814 E-mail: [email protected]: http://www.geo.umass.edu/stategeologist
MHD Highway
MHD B ridge
G WS I
WC R
B WS C
Westboro P rivate
MWR A
P WS
Wells Data S ources
Limit of Data
Topography
75 meters
175
1:72,000S cale
0 42 km
0 2 Miles
Measured Depth
0 - 33 - 66 - 99 - 1212 - 15> 15 meters
3
6
9
15
12
18
6
6
6
9
3
1 2
12
3
3
3
12
3
15
15
3
9
121
2
15
6
9
9
3
9
6
6
6
12
18
15
6
12
3
3
6
3
6
9
3
3
18
9
9
6
3
9
6
3
B edroc k Depth
C ontours (3m interval)S hallow/outcrops
Limit of Data
Topography
75 meters
175
1:72,000S cale
0 42 km
0 2 Miles
9090
7575
105
105
120120
135135
6060
135
135
7575
7575
105105
6060
120120
7575 9090
105
105
120120
105105
9090
7575
9090
9090
9090
9090
9090
7575
9090
7575
9090
9090
7575
B edroc k S urfac e E levation B edrock Wells
B edrock E levation (15 meter contours)
Limit of Data
(meters a.s .l.)1:72,000S cale
0 42 km
0 2 Miles
Depth to water0 - 3
3 - 6
6 - 9
9 - 12
> 12 meters
90
75
105
60
120
135
75
7 5
105
75
120
3
6
9
1 2
6
6
9
9
3
3
6
6
96
S ubs urface Water L evel
Water surface elevation (m)
Depth to water (m)
Limit of Data
Topography
75 meters
175
1:72,000S cale
0 42 km
0 2 Miles
Y ield_G P M
0 - 5
5 - 10
10 - 20
20 - 50
> 50 G P M
Well Y ields
Topography
75 meters
175
1:72,000S cale
0 42 km
0 2 Miles
Location of permeable overburden
Figure D6. Map of the extent of permeable overburden. Shaded region shows the areas where surface materials are permeable or have a high hydraulic conductivity. The high capacity to store water in these areas may provide a source of recharge to underlying bedrock. Unshaded areas are less permeable (low hydraulic conductivity) and consist predominantly of glacial till and occasional bedrock exposures. Surficial materials shown on the map modified from a data layer compiled by Byron Stone (1992) at 1:125,000. This data layer is available from MassGIS.
Extent of sulfide mineralization
Figure D7. Map showing the extent of sulfide mineralization observed in outcrops. Most common minerals observed are pyrite and chalcopyrite. Sulfide mineralization may have an influence on groundwater quality in localized areas.
Outcrops where fracture measurements
were taken
Bedrock Exposure
MASS.
QUANDRANGLE LOCATION
DISCUSSION
This sheet summarizes basic data related to the water resources in the quadrangle. These basic data include: 1) a map showing the location of wells used to generate groundwater contour and well yield distribution maps (Figure D1), 2) a depth to bedrock map that shows the general distribution of overburden thickness (Figure D2), 3) a generalized contour map of the bedrock surface (Figure D3), 4) a map indicating the general direction of groundwater flow in the bedrock and the depth to the water table in bedrock wells (Figure D4), 5) a map showing the distribution of yields in bedrock wells (Figure D5), 6) a map delineating the extent of permeable surface materials overlying the bedrock (Figure D6), and, 7) a map depicting the location of sulfide mineralization observed in bedrock outcrops (Figure D7).
Well data were collected from eight sources; each source contained different attributes and spatial referencing. Some data had no coordinate information or elevation data. These wells were located using parcel data provided by MassGIS and elevations were interpolated from the digital terrain model. Every effort was made to standardize the data sets into a consistent format. However, inconsistencies do exist. All contoured data shown on the maps were machine contoured using kriging, inverse distance squared weighting or other interpolation techniques. No adjustments were made to the water level and contour data for seasonality, the year of well construction or topography. Data points from which the contours were produced are plotted, where feasible, to show the spatial variability in the data set.
Accordingly, these maps should be used with caution and should not be a substitute for site-specific data. Greater spatial variability is expected at more local scales. However, the maps do provide a reasonable depiction of general patterns across the region and can be used as a regional framework.
Figure D1. Map of well locations in the Marlborough quadrangle. Well data were collected from eight different sources and assembled into a well data base. The well data sources include monitoring wells from the MA Department of Environmental Protection Bureau of Waste Site Cleanup (BWSC), the Massachusetts Water Resources Authority soil borings (MWRA), bridge and highway boring logs from the Massachusetts Highway Department (MHD Bridge and MHD Highway), the U.S. Geological Survey GWSI data base (GWSI), and well completion reports from the MA Department of Conservation and Recreation (Westboro Private and WCR). The entire data set comprises 1813 wells. Limit of well data extends 500 m beyond the edge of the quadrangle. Data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters.
Figure D2. Generalized map of the depth to bedrock. Contours are drawn at 3 m intervals. Data points from which the generalized contours were produced are shown as open black circles and indicate the spatial variability in the depth to bedrock data. A total of 798 wells and 534 outcrop locations were used to construct the map. The contours show only a generalized depth to bedrock map over the region and should be used with caution when examining specific sites. Greater spatial variability is expected at larger scales. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters.
Figure D3. Generalized contour map of the bedrock surface. Contours are drawn at 15 m intervals. Contours were generated by subtracting the interpolated depth to bedrock surface produced in Figure D2 from topography. Data points used in this analysis are shown as black dots and include a total of 798 wells and 534 outcrop locations. The contours show only a generalized bedrock surface over the region and should be used with caution when examining specific sites. Greater spatial variability is expected at larger scales. All elevations are in meters above sea level.
Figure D4. Generalized map showing the static groundwater elevations and depth to groundwater of bedrock wells. This map does not include water level information from overburden wells. Contour intervals for the groundwater elevations are 15 m and the intervals for the depth to groundwater are 3 m. Data points from which the generalized contours of depth to groundwater and groundwater elevation were produced are shown as open black circles. The various sizes of the circles indicate the spatial variability in the depth to groundwater data. A total of 546 wells were used to construct the contours. The contours show only generalized water level information over the region and should be used only for examining the general pattern of groundwater flow in the bedrock. No adjustments were made to water level data for seasonal variation or for the year of well construction. In addition, no adjustments were made to the groundwater contours for local variability in surface topography. Accordingly, there are areas where generalized groundwater contours appear above local topography. These areas are shown by dashed lines on the map. Caution is advised when examining specific sites. Greater spatial variability is expected at local scales. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters.
Figure D5. Generalized map showing the distribution of well yields in bedrock wells. No overburden wells are shown on this map. Yield is expressed in gallons per minute (gpm). A total of 318 wells were used to construct this map. All data are superimposed on top of a colored hill shade of digital topography. Topography taken from the 1:5000 scale digital terrain model available through MassGIS. Elevations are in meters.
