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Attachment B Attachment B TRANSECT AND BOREHOLE DESCRIPTIONS AND LOCATION MAPS Seismic-Reflection, Electrical-Resistivity-Imaging, and Calibration-Borehole Data-Acquisition and Analysis Services Broad Top Coalfield, Bedford, Fulton, and Huntingdon Counties, South-Central Pennsylvania Bureau of Geological Survey Pennsylvania Department of Conservation and Natural Resources 2019 Note: This attachment contains site descriptions and location maps for five (5) proposed transects (traverse lines), covering commercial seismic-reflection data, a seismic-reflection survey, and an electrical-resistivity-imaging survey, and for one (1) proposed calibration air-rotary borehole, situated in the Broad Top coalfield and vicinity, Bedford, Fulton, and Huntingdon Counties, south-central Pennsylvania. To assist prospective bidders in understanding the bedrock geology and field conditions to be encountered, descriptions of the likely geologic formations and rock types to be found cropping out and in the shallow subsurface (i.e., upper thousand feet) are included. The descriptions (assessments) are a reasonable attempt by the Department to provide objective geologic information about the work sites. As such, they should be considered average probable conditions and should not be considered guarantees. General Description of Geologic Units Underlying the proposed work sites are one or more of the following bedrock geologic units, including, from oldest to youngest, the Upper Devonian and Mississippian Rockwell Formation; the Mississippian Burgoon Sandstone and Mauch Chunk Formation; and the Pennsylvanian Pottsville, Allegheny, and Glenshaw Formations. The Rockwell Formation consists of buff, fine- to medium-grained, crossbedded, argillaceous sandstone, and includes some carbonaceous shale containing marine fossils in part, sporadic conglomerate beds, and local diamictite. The Burgoon Sandstone is light-gray to buff, medium- grained, crossbedded sandstone and minor siltstone, and includes conglomerate in places toward the base; it contains plant fossils and minor, thin coals locally. The Mauch Chunk Formation consists of grayish-red shale, siltstone, mudstone, sandstone, and some conglomerate; some local nonred zones occur. The Trough Creek Limestone (Loyalhanna Member) occurs at the base of the Mauch Chunk, consisting of greenish-gray, crossbedded calcareous sandstone to sandy limestone. The Pottsville Formation is predominantly gray, fine- to coarse-grained sandstone and quartz-pebble conglomerate, and much subordinate shale, claystone, siltstone, and coal. Pottsville coals have rarely been mined commercially in the Broad Top. The Allegheny Formation consists of cyclic sequences of sandstone, siltstone, shale, limestone, claystone, and coal. The three principal commercial coals mined in the past in the Broad Top—in ascending order, the Fulton, Barnett, and Kelly—occur in the lower two-thirds of the Allegheny Formation. The Glenshaw Formation (lower half of the Conemaugh Group) is composed of cyclic sequences of shale, siltstone, sandstone, redbeds (predominantly mudstones), and thin limestone and coal; it includes up to four marine shale horizons (zones). Broad Top Coalfield The Broad Top coalfield, south-central Pennsylvania, covers about 75 square miles and is situated near the intersection of Bedford, Fulton, and Huntingdon Counties (Figure 1). It is readily accessible from Harrisburg and Pittsburgh by the Pennsylvania Turnpike (Interstate 76), at Exit 180, via State Route (SR) 475, SR 655, and SR 913 to Robertsdale; and Exit 161, via US Route (US) 30 and SR 26 to Hopewell (SR 915) or Saxton (SR913). It can also be accessed from State College by I99, at Exit 48, via SR 453, US 22, and SR 26; and from Altoona by I99, at Exit 23, via SR 36, SR 164, and SR 26. From Huntingdon, it can also be accessed by SR 26 to SR 994 or to SR 913. TRANSECT 1 TRANSECT 1, covering a distance of 7 line miles, is situated along SR 994 (Old Plank Road) in Huntingdon County, extending from the east side of Sideling Hill (east end, Longitude (X) and Latitude (Y) coordinates X = -78.0441, Y = 40.2074), Saltillo 7.5-minute quadrangle, to 2 miles north of Eagles Foundry (west end, coordinates X = -78.1126, Y = 40.2606), along Trough Creek Valley, Cassville 7.5- minute quadrangle, (Figures 1 and 2). The transect crosses State Game Lands 121 around Joller and Rays Hill. Additionally, the transect extends past PGE Marcellus gas-well properties, Hess Tract (including well API 37-061-20001-00-00), mostly just west Eagle Foundry, and Shannon Todd Pad A (including well API 37-061-20014-00-00), about 1 mile north of Eagle Foundry and just to the east of SR 994 (Figure 2). TRANSECT 1 starts (east end) in the Rockwell Formation and continues northwestward, successively crossing the Burgoon Sandstone (Sideling Hill) and Mauch Chunk Formation, followed by the Pottsville and Allegheny Formations (Rays Hill area), and terminating (west end) in a broad expanse of the Mauch Chunk Formation. TRANSECT 2 TRANSECT 2, covering a distance of 14 line miles, follows SR 913 in Fulton and Huntingdon Counties, extending from the east side of Sideling Hill (east end, coordinates X = -78.0710, Y = 40.1312), Saltillo 7.5-minute quadrangle, to Terrace Mountain (near East Saxton) (west end, coordinates X = -78.2287, Y = 40.2253), Saxton 7.5-minute quadrangle (Figures 1 and 3). The transect runs just south of State Game Lands 067 near Barnettstown. TRANSECT 2 begins (east end) in the Rockwell Formation and proceeds northwestward, crossing the Burgoon Sandstone (Sideling Hill) and Mauch Chunk Formation, next through areas of the Pottsville and Allegheny Formations (Robertsdale and Broad Top City areas), then over the Pottsville Formation (Shoups Run valley), and back again in the Mauch Chunk Formation, then the Burgoon Sandstone and finishing (west end) in the Rockwell Formation. Figure 1. Reconnaissance bedrock geologic map of the Broad Top coalfield, showing locations of TRANSECTS 1, 2, and 3 (labeled red lines) and TRANSECTS 4 and 5 (labeled blue line). Figure 2. Location map of TRANSECT 1 (red line), along northeastern part of the Broad Top coalfield in Huntingdon County. Locations of Marcellus gas wells indicated by black arrows. Figure 3. Location map of TRANSECT 2 (red line), crossing northern part of the Broad Top coalfield in Fulton and Huntingdon Counties. TRANSECT 3 TRANSECT 3, covering a distance of 10 line miles, runs along SR 915 in Bedford County, extending from the intersection with Wells Valley Road near Sideling Hill Creek (east end, coordinates X = -78.1386, Y = 40.0764), Wells Tannery 7.5-minute quadrangle, to just west of the intersection of State Route 26 (Raystown Road) and Polecat Hollow Road, west of Hopewell (west end, coordinates X = -78.2779, Y = 40.1409), Hopewell 7.5-minute quadrangle (Figures 1 and 4). The transect crosses locally or passes just north of State Game Lands 261 near Langdondale and Sandy Run. TRANSECT 3 commences (east end) in the Mauch Chunk Formation and continues within the unit for about two-thirds the total distance of the transect. The transect next successively crosses the Pottsville, Allegheny, and Glenshaw Formations, and then proceeds to continue across the same three units in reverse order just west of Langdondale within the Sandy Run valley. TRANSECT 3 then crosses the Mauch Chunk Formation and Burgoon Sandstone, and terminates (west end) in the Rockwell Formation. Figure 4. Location map of TRANSECT 3 (red line), crossing the southwest corner of the Broad Top coalfield and adjacent areas in Bedford County. TRANSECTS 4 and 5 TRANSECTS 4 and 5 coincide, and each covers a distance of 2.5 line miles. They follow a portion of TRANSECT 1, along SR 994 (Old Plank Road) in Huntingdon County, extending from the hairpin curve just south of Joller on State Game Lands 121 (east end, coordinates X = -78.0661, Y = 40.2008), Saltillo 7.5- minute quadrangle, to about 1 mile northwest of crossroads at Cooks (west end, coordinates X = - 78.0984, Y = 40.2232), still within the Saltillo 7.5-minute quadrangle (Figures 1 and 5). TRANSECTS 4 and 5 begin (east end) in the lower Pottsville Formation along the east side of Rays Hill, next cross the lower Allegheny Formation toward the crest of the ridge, then continue back into the Pottsville Formation, and finally terminate in a broad expanse of the Mauch Chunk Formation. Figure 5. Location map of TRANSECTS 4 and 5 (blue line), following a portion of TRANSECT 1 (Figures 1 and 2), along northeastern part of the Broad Top coalfield in Huntingdon County. Calibration Borehole (HUN061_0661) A calibration borehole, designated HUN061_0661, will be drilled along Rays Hill on State Game Lands 121, at the primary (preferred) location just south of SR 994 (coordinates X = -78.0729, Y = 40.2055), Saltillo 7.5-minute quadrangle (Figures 1 and 6). In the unlikely event the primary location proves to be unsatisfactory at or before the time of mobilization, the borehole will be drilled at the secondary (backup) location, 0.35 mile north of the primary location. The anticipated total depth of the proposed borehole is 500 feet. Borehole HUN061_0661 will commence in the lower Allegheny Formation, about 40 feet or less above the Barnett coal, which is about 5 feet thick and extensively deep mined along Rays Hill in the past. Occurring about 50 feet below the Barnett is the Fulton coal, which is about 5 feet thick and also deep mined in the area in the past. Based on available underground-mine maps, drilling at the primary location for HUN061_0661 is not likely to encounter the old Barnett workings, and it is also believed that the site will be considerably west of the known limits of old Fulton mine workings. Therefore, drilling will probably not encounter old deep-mine workings, but at most only one (1) mine void. The base of the Allegheny Formation is traditionally placed about 20 to 30 feet below the Fulton, so that the total thickness for the Allegheny here is about 120 feet.
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