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PLATE 1
<br />RESULTS ofFINAL HYDR OGEOL OGIC INVESTIGA TION ofBISHOPS GA TE SUBDIVISION
<br />A Bedrock Geology and Fracture Fabric
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<br />Wells and Potential Contaminant Threats
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<br />from
<br />Yield
<br />(gpm)
<br />LINEAMENT PLATFORMS
<br />GIS
<br />Total Depth
<br />(feet)
<br />WWNC -87 -0179
<br />12
<br />Scale
<br />N1
<br />(Name / Roll /Frame)
<br />Type
<br />4
<br />Total n
<br />WWIN-83 -0061
<br />1:12000
<br />Purcellville Quadrangle
<br />Topographic Map
<br />2
<br />222
<br />10
<br />1:20000
<br />NAPP
<br />NAPP
<br />7702 76
<br />7702 75
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<br />NHAP80
<br />17 127
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<br />—4
<br />W -39
<br />1:80000
<br />NHAP80
<br />16 86
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<br />I Emery & Garrett Groundwater, Inc. 56Mam Street, Meredith, NH 03253
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<br />Legend for Structure Symbols
<br />® Outcrop, float, or soil exposure identified.
<br />V 65-
<br />Strike and Dip (88') of Fractures.
<br />Strike and Dip (65e) of Foliation.
<br />Well Data
<br />Well ID
<br />from
<br />Yield
<br />(gpm)
<br />LINEAMENT PLATFORMS
<br />GIS
<br />Total Depth
<br />(feet)
<br />WWNC -87 -0179
<br />12
<br />Scale
<br />Image ID
<br />(Name / Roll /Frame)
<br />Type
<br />Observational
<br />Trials*
<br />Total n
<br />WWIN-83 -0061
<br />1:12000
<br />Purcellville Quadrangle
<br />Topographic Map
<br />2
<br />222
<br />10
<br />1:20000
<br />NAPP
<br />NAPP
<br />7702 76
<br />7702 75
<br />Color Infrared
<br />Aerial Photographs
<br />3
<br />298
<br />5
<br />1:58000
<br />NHAP80
<br />17 127
<br />Color Infrared
<br />Aerial Photograph
<br />2
<br />314
<br />W -39
<br />1:80000
<br />NHAP80
<br />16 86
<br />Black & White
<br />Aerial Photograph
<br />2
<br />335
<br />266
<br />(* - of each image)
<br />9
<br />Totals: 9
<br />1169
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<br />I Emery & Garrett Groundwater, Inc. 56Mam Street, Meredith, NH 03253
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<br />Legend for Structure Symbols
<br />® Outcrop, float, or soil exposure identified.
<br />V 65-
<br />Strike and Dip (88') of Fractures.
<br />Strike and Dip (65e) of Foliation.
<br />Well Data
<br />Well ID
<br />from
<br />Yield
<br />(gpm)
<br />Loudoun County
<br />Bedrock Depth
<br />(feet)
<br />GIS
<br />Total Depth
<br />(feet)
<br />WWNC -87 -0179
<br />12
<br />32
<br />345
<br />WWIN -87 -0169
<br />15
<br />40
<br />405
<br />WWIN-83 -0061
<br />12
<br />6
<br />425
<br />W -1
<br />5
<br />10
<br />500
<br />W -2
<br />2
<br />30
<br />700
<br />W -3
<br />5
<br />57
<br />550
<br />W -31
<br />15
<br />79
<br />255
<br />W -39
<br />4
<br />35
<br />520
<br />W -41
<br />12
<br />40
<br />266
<br />W -43
<br />9
<br />40
<br />400
<br />W -44
<br />75
<br />40
<br />386
<br />W -45
<br />10
<br />15
<br />400
<br />W -46
<br />6
<br />30
<br />266
<br />W -65
<br />30
<br />30
<br />301
<br />W -66
<br />7
<br />25
<br />400
<br />W -67
<br />10
<br />NA
<br />250
<br />W -68
<br />3
<br />30
<br />597
<br />W -69
<br />4
<br />40
<br />500
<br />W -70
<br />10
<br />10
<br />500
<br />W -71
<br />100
<br />15
<br />350
<br />W -72
<br />40
<br />10
<br />320
<br />W -73
<br />30
<br />20
<br />300
<br />W -74
<br />65
<br />30
<br />256
<br />W -75
<br />25
<br />15
<br />225
<br />W -76
<br />13
<br />15
<br />739
<br />W -77
<br />6
<br />30
<br />580
<br />W -78
<br />5
<br />15
<br />360
<br />W -79
<br />11
<br />50
<br />401
<br />W -80
<br />50
<br />25
<br />565
<br />W -84
<br />50
<br />45
<br />260
<br />W -85
<br />30
<br />22
<br />255
<br />W -86
<br />30
<br />20
<br />255
<br />W -87
<br />5
<br />20
<br />320
<br />W -96
<br />7
<br />20
<br />280
<br />W -97
<br />2.5
<br />25
<br />620
<br />W -98
<br />50
<br />20
<br />400
<br />W -99
<br />30
<br />18
<br />230
<br />W -103
<br />50
<br />10
<br />251
<br />W -105
<br />6
<br />25
<br />300
<br />W -115
<br />10
<br />10
<br />351
<br />W -122
<br />15
<br />38
<br />266
<br />MINIMUM .
<br />2
<br />6
<br />225
<br />MAXIMUM
<br />106
<br />79
<br />739
<br />AVERAGE
<br />21
<br />27
<br />387
<br />Coincident Lineaments
<br />37• FRACTURE - SUPPORTED COINCIDENT LINEAMENT: Observed
<br />on more than three scales of imagery AND co- parallels
<br />nearby fracture family or bedding trends.
<br />Observed on more than three scales of imagery.
<br />(trend is posted In degrees east of north)
<br />Legend for Potential Contaminant Threats
<br />Legend for Bedrock Geology
<br />Potential Contaminant Threat -- identified
<br />(after Southworth, 1995)
<br />through (EDR) Environmental Data Resources,
<br />Inc. search, or from EGGI windshield and field
<br />ALLUVIUM — Alluvium and fine colluvial debris,
<br />undifferentiated. Mixtures of clay, sand, pebbles, gravel,
<br />surveys. See Appendix A for details on EDR
<br />results.
<br />cobbles, and some boulders underlying sinuous flood
<br />Potential threat to groundwater quality
<br />identified during EGGI windshield survey.
<br />plains along tributaries of Catoctin Creek.
<br />GARNET MONZOGRANITE — Light — bluish —gray to light —olive
<br />gray medium— grained monzogranite composed of 30
<br />Yg>`
<br />percent quartz, 25 to 30 percent rod and bleb perfhite
<br />and microcllne, and 40 to 45 percent saussuritized
<br />oligioclose.
<br />BIOTITE GRANITE GNEISS — Medium —dark gray to
<br />light —brown gneiss composed of 25 to 30 percent
<br />ybg
<br />quartz, 30 to 55 percent rod and bleb perfhite,
<br />microcline, and orthoclase, and 20 to 45 percent
<br />saussuritized plaglociase. Commonly 5 to 15 percent
<br />biotite and opaque minerals.
<br />Coincident Lineaments
<br />37• FRACTURE - SUPPORTED COINCIDENT LINEAMENT: Observed
<br />on more than three scales of imagery AND co- parallels
<br />nearby fracture family or bedding trends.
<br />Observed on more than three scales of imagery.
<br />(trend is posted In degrees east of north)
<br />Legend for Potential Contaminant Threats
<br />Loudoun
<br />Potential Contaminant Threat -- identified
<br />Valley High
<br />through (EDR) Environmental Data Resources,
<br />Inc. search, or from EGGI windshield and field
<br />School
<br />Atsearch
<br />surveys. See Appendix A for details on EDR
<br />results.
<br />Faim •
<br />Potential threat to groundwater quality
<br />identified during EGGI windshield survey.
<br />Legend forExisting Wells
<br />WWWIN -83- 0061+ Well ID number and location from
<br />Loudoun Co. GIS database
<br />W -74
<br />Indicates yield of 50 gpm or more,
<br />at Wright Farm Subdivision -
<br />_ W -3
<br />Well ID number and location from .
<br />Wright Farm Subdivision
<br />OWells outside 2000' buffer
<br />at Wright Farm Subdivision
<br />ROSE DIAGRAM of ROSE DIAGRAM of
<br />FRACTURE FABRIC DATA LINEAMENT DATA
<br />(eased on lineaments collected within a 1.0 kilometer
<br />radius circle centered on the study area at utmX =
<br />267,077 and utmY = 4,338,295)
<br />All Fractures All Lineaments
<br />recorded
<br />to Combined e
<br />in the area
<br />n = 19 n = 346
<br />Y
<br />ZandFrc, mposed
<br />rams for
<br />of Llneament /
<br />102' Family Trends N = 346
<br />126'
<br />102'—
<br />,Y
<br />Y
<br />s oe ,r
<br />ROSE DIAGRAM NOTATION - Rome petals represent trends o/ aMply dipping 7rasturse or Ilnwmeme deified by 111Nng gaussian aur5se to ad th }nqu W hisb9rams. The find of each peak 1. powNd In
<br />degrees wet of north. Petal width la o measure of data waster and Pdal length a measure of relative numben d data In eaah fracture or Ilnwmenl family. When eMletioalh valid, a mean dip Is posted
<br />parenthetically for fracture families. Right -hand rule notation Is used In all oaese, that la, 4(87) represents a fracture family which sMkse 4 degrses wood of north and dips 67 degrees east (to the right
<br />when facing 4' east of north). A family at 784(117) has the same strike but It dips 87 degrees wed (to the right when facing I84' east of north).
<br />GN [1
<br />1• b'
<br />.
<br />ZoE
<br />Contour Interval = 10'
<br />Polyconlc Projection.
<br />1927 North American Datum.
<br />Base map information from USGS
<br />topographic quadrangle maps of
<br />Purcellville, Virginia.
<br />BISHOPS GATE SUBDIUSIONSTUDYAREA
<br />GROUNDWATER INVESTIGATION
<br />LINEAMENTS, BEDROCK GEOLOGY,
<br />and STRUCTURE
<br />Job Number: Date:
<br />VA 0204960J March 2006 PLATE I
<br />Emery & Garrett Groundwater, Inc.
<br />Ph. , 603 -- 2794426 56Meia Sbwr BMW, cippge�.cam
<br />FAX..'603.27MM P.O. Box 3678 Web: rvww.e�i.wm
<br />Mend,'Ib, Iw 03263
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