STATE OF MARYLAND 1 CONTENTS BASE LINE DESIGNATION STATE COUNTY QUAD BALTIMORE (DESTROYED) MARYLAND BALTIMORE N390762 CAMBRIDGE CBL (1999 VERIFIED) MARYLAND DORCHESTER N380761 HAGERSTOWN CBL (1993 REMEASURED) MARYLAND WASHINGTON N390774 HARFORD COUNTY CBL MARYLAND HARFORD N390762 CLARKSVILLE CBL MARYLAND HOWARD N390763 LEONARDTOWN CBL MARYLAND ST. MARYS N380763 PITTSVILLE CBL MARYLAND WICOMICO N380752 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N390762 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: BALTIMORE MARYLAND ROCKVILLE MD 20852 - OCTOBER 29, 1986 PROJECT ACCESSION NUMBER: G16044 BALTIMORE COUNTY LIST OF ADJUSTED DISTANCES (JANUARY 26, 1980) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 MTS 3.05 150 MTS 3.23 149.9712 149.9713 0.4 0 MTS 3.05 425 MTS 3.77 424.9951 424.9957 0.7 0 MTS 3.05 1400 MTS 5.72 1399.9250 1399.9275 0.9 150 MTS 3.23 425 MTS 3.77 275.0239 275.0244 0.5 150 MTS 3.23 1400 MTS 5.72 1249.9538 1249.9563 0.8 425 MTS 3.77 1400 MTS 5.72 974.9299 974.9319 0.5 DESCRIPTION OF BALTIMORE BASE LINE YEAR MEASURED: 1977-1979 CHIEF OF PARTY: MDC THE BASE LINE IS LOCATED ABOUT 6 MILES EAST OF BALTIMORE, ALONG STATE HIGHWAY 150 AT THE GLEN L. MARTIN AIRPORT. THE BASE LINE IS ON THE SOUTHEAST SIDE OF THE AIRPORT ON THE SOUTHWEST SIDE OF THE MAIN NORTHWEST-SOUTHEAST RUNWAY AND IS ABOUT 225 FEET SOUTHWEST OF THE RUNWAY. TO REACH FROM THE JUNCTION OF STATE HIGHWAYS 150 AND 587, WHICH IS AT THE NORTHWEST EDGE OF THE AIRPORT, GO SOUTHERLY ON STATE HIGHWAY 587 FOR 1.15 MILES TO THE JUNCTION WITH DOGWOOD STREET ON THE RIGHT TURN LEFT AND FOLLOW A PAVED ROAD (STRAWBERRY POINT ROAD) SOUTHEASTERLY FOR 0.7 MILE TO A GATE AND A LARGE HANGAR. PASS THROUGH THE GATE AND GO SOUTHEAST FOR 0.3 MILE TO AN UNUSED CONCRETE TAXI STRIP LEADING TO A CIRCULAR COMPASS AND THE 0 METER POINT 97 FEET SOUTH OF THE CENTER OF THE COMPASS. THE 0 METER POINT IS 97 FEET SOUTH OF THE RADIUS POINT OF THE CIRCULAR COMPASS AREA AND ABOUT 1500 FEET SOUTHEAST OF THE LARGE HANGER. ALL THE MARKS ARE MARYLAND STATE HIGHWAY ADMINISTRATION TRAVERSE DISKS SET IN THE TOP OF ROUND CONCRETE MONUMENTS SET FLUSH WITH THE GROUND. THE DISKS ARE STAMPED 0 MTS, 150 MTS, 425 MTS, AND 1400 MTS. THESE POINTS MAKE UP THE BASE LINE ALONG WITH A DISK SET AT 100 FEET SOUTHWEST OF THE 0 METER POINT TO BE USED FOR TAPE CALIBRATION. THERE IS A DISK SET AT 800 METERS BUT IT WAS NOT USED AS PART OF THE BASE LINE. THE BASE LINE RUNS NORTHWEST-SOUTHEAST WITH THE 0 METER POINT ON THE SOUTHEAST END. THE BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE STATE HIGHWAY ADMINISTRATION. FOR FURTHER INFORMATION CONTACT MR. JAMES F. LOSKOT, JR. CHIEF, SURVEY SECTION, STATE HIGHWAY ADMINISTRATION AT 300 WEST PRESTON STREET IN BALTIMORE, MARYLAND 21201. PHONE (301) 383-4332. NOTE--USE OF THE BASE LINE MUST BE CLEARED BY THE STATE AVIATION ADMINISTRATION AT THE CONTROL TOWER BUILDING. BEFORE USING CONTACT MR. LOSKOT AT THE ABOVE ADDRESS FOR PROCEDURES IN GAINING ACCESS TO THE BASE LINE. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N380761 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: CAMBRIDGE CBL MARYLAND ROCKVILLE MD 20852 - NOVEMBER 13, 1999 PROJECT ACCESSION NUMBER: G16044 DORCHESTER COUNTY NEAREST TOWN: CAMBRIDGE LIST OF ADJUSTED DISTANCES (JANUARY 26, 1980) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 MTS 6.10 150 MTS 6.20 149.9605 149.9606 0.2 0 MTS 6.10 425 MTS 6.31 424.9967 424.9967 0.4 0 MTS 6.10 950 MTS 6.42 949.9527 949.9527 0.5 150 MTS 6.20 425 MTS 6.31 275.0362 275.0362 0.3 150 MTS 6.20 950 MTS 6.42 799.9922 799.9922 0.4 425 MTS 6.31 950 MTS 6.42 524.9560 524.9560 0.3 DESCRIPTION OF CAMBRIDGE BASE LINE YEAR MEASURED: 1977 YEAR VERIFIED: 1993, 1999 CHIEF OF PARTY: DMM A TAPE CALIBRATION MONUMENT IS SET 100 FEET FROM THE 0-METER POINT. THE REDUCED MARK TO MARK DISTANCE IS 100.00 FEET. THE BASE LINE IS LOCATED ABOUT 4.8 KM (3.0 MI) NORTHWEST OF CAMBRIDGE AT THE UNIVERSITY OF MARYLAND CENTER FOR ENVIRONMENTAL AND ESTUARINE STUDIES AT HORN POINT. THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE NORTH EDGE OF AN EAST-WEST GRASS RUNWAY. THE BASE LINE IS AN EAST-WEST LINE WITH THE 0-METER POINT ON THE WEST END. IT CONSISTS OF THE 0, 150, 425, AND 950 METER POINTS WITH A 100-FOOT TAPE CALIBRATION STATION LOCATED OFF LINE AND EAST-NORTHEAST OF THE 0-METER POINT. TO REACH THE 0-METER POINT FROM THE JUNCTION OF U.S. HIGHWAY 50 AND STATE HIGHWAY 343 (WASHINGTON STREET), LOCATED IN EASTERN CAMBRIDGE, GO WESTERLY ON STATE HIGHWAY 343 , THROUGH CAMBRIDGE, FOR 3.6 KM (2.2 MI) TO THE GREENLAWN CEMETERY ON THE RIGHT. CONTINUE WESTERLY ON STATE ROAD 343 FOR 1.5 KM (0.9 MI) TO A FORK. TAKE THE RIGHT FORK AND GO NORTHWEST ON HORNS POINT ROAD FOR 2.5 KM (1.6 MI) TO THE ENTRANCE DRIVE FOR THE UNIVERSITY CENTER ON THE RIGHT. CONTINUE NORTHWEST ON HORNS POINT ROAD FOR 0.66 KM (0.41 MI) TO THE 0-METER POINT ON THE LEFT IN A CLEARED PATH AT THE END OF PAVEMENT AND INTERSECTION OF TWO ROADS ON THE RIGHT. THE 0-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "0 MTS. 1977" SET IN THE TOP OF A 38 CM (15 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 88.2 M (289.4 FT) WEST OF THE CENTERLINE OF HORNS POINT ROAD, 43.2 M (141.7 FT) WEST-SOUTHWEST OF WOODEN UTILITY POLE 12 A, 31.0 M (101.7 FT) WEST-SOUTHWEST OF A METAL WITNESS POST, AND 0.5 M (1.6 FT) SOUTH OF A METAL WITNESS POST. THE 150-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "150 MTS. 1977" SET IN THE TOP OF A 36 CM (14 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 35.5 M (116.5 FT) NORTHEAST OF THE CENTERLINE OF HORNS POINT ROAD, 20.3 M (66.6 FT) SOUTHEAST OF THE CENTERLINE OF A GRAVEL ROAD LEADING TO SEVERAL SMALL PONDS, 4.1 M (13.5 FT) EAST-SOUTHEAST OF A METAL WITNESS POST, 3.1 M (10.2 FT) SOUTH-SOUTHEAST OF A FIBERGLASS WITNESS POST, AND 3.1 M (10.2 FT) SOUTH OF A METAL WITNESS POST. THE 425-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "425 MTS. 1977" SET IN THE TOP OF A 36 CM (14 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 52.0 M (170.6 FT) NORTHEAST OF THE CENTERLINE OF A GRAVEL ROAD AT THE SOUTHERN EDGE OF THE RUNWAY, 8.3 M (27.2 FT) SOUTHWEST OF A METAL WITNESS POST IN A DRAINAGE DITCH, AND 6.0 M (19.7 FT) SOUTH OF A FIBERGLASS WITNESS POST IN A DRAINAGE DITCH. THE 950-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "950 MTS. 1977" SET IN THE TOP OF A 36 CM (14 IN) DIAMETER CONCRETE POST RECESSED 2.5 CM (1 IN) BELOW THE SURFACE OF THE GROUND. IT IS 49.7 M (163.1 FT) WEST OF THE SOUTHEASTERN MOST LIGHT POST AROUND SEVERAL SMALL PONDS AND 25.7 M (84.3 FT) NORTH OF THE NORTHERN EDGE OF A BRUSH LINE. 1THE 100-FOOT TAPE CALIBRATION STATION IS A BLANK DISK WITH NO STAMPING SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE POST PROJECTING 2.5 CM (1 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 23.2 M (76.1 FT) SOUTHWEST OF THE CENTERLINE OF HORNS POINT ROAD, 12.7 M (41.7 FT) WEST-SOUTHWEST OF WOODEN UTILITY POLE 12 A, AND 0.4 M (1.3 FT) WEST-SOUTHWEST OF A METAL WITNESS POST. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THIS BASE LINE DOES NOT MEET CURRENT NGS SITE SPECIFICATIONS (LONGEST DISTANCE SHOULD BE GREATER THAN 1000 METERS). TAPE CALIBRATION MARK NOT VERIFIED IN 1999. STATE HIGHWAY ADMINISTRATION. FOR MORE INFORMATION PLEASE CONTACT DON BAUMGARTNER, MARYLAND DEPARTMENT OF TRANSPORTATION, STATE HIGHWAY ADMINISTRATION, SURVEY SECTION, P.O. BOX 2679, SALISBURY, MD 21802. TELEPHONE 410-376-3616. OR CONTACT MR. DONALD MULCARE, MARYLAND STATE HIGHWAY ADMINISTRATION, PLATS AND SURVEYS DIVISION, MAIL STOP M-101, 707 NORTH CALVERT STREET, BALTIMORE, MD 21202. TELEPHONE 410-545-8963 (EMAIL dmulcare@ibm.net). 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N390774 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: HAGERSTOWN CBL MARYLAND ROCKVILLE MD 20852 - MAY 17, 1993 PROJECT ACCESSION NUMBER: 16044 WASHINGTON COUNTY NEAREST TOWN: MAUGANSVILLE LIST OF ADJUSTED DISTANCES (MAY 12, 1993) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 MTS 1977 152.400 150 MTS 1977 149.229 149.9818 150.0153 0.1 0 MTS 1977 152.400 425 MTS 1977 149.994 424.9949 425.0017 0.1 0 MTS 1977 152.400 1160 MTS 1977 147.834 1159.9327 1159.9417 0.2 150 MTS 1977 149.229 425 MTS 1977 149.994 275.0130 275.0141 0.1 150 MTS 1977 149.229 1160 MTS 1977 147.834 1009.9507 1009.9516 0.1 425 MTS 1977 149.994 1160 MTS 1977 147.834 734.9377 734.9409 0.1 A TAPE CALIBRATION MONUMENT IS SET 100 FEET FROM THE 0-METER POINT. THE REDUCED MARK-TO-MARK DISTANCE IS 100.01 FEET. DESCRIPTION OF HAGERSTOWN BASE LINE YEAR MEASURED: 1977 YEAR REMEASURED: 1979, 1993 CHIEF OF PARTY: KM THE BASE LINE IS LOCATED ABOUT 6.4 KM (4.0 MI) NORTH OF HAGERSTOWN AT THE WASHINGTON COUNTY REGIONAL AIRPORT. THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE EASTERN EDGE OF RUNWAY (2-20). **NOTE** MR. RODNEY SHOOP, AIRPORT MANAGER OR MRS. CAROLYN MOTZ, TERMINAL MANAGER, 18434 SHOWALTER ROAD, HAGERSTOWN, MD 21742, MUST BE NOTIFIED 24-HOURS PRIOR TO WORK ON THE BASE LINE. THE SITE CAN ONLY BE UTILIZED DURING THE WEEK, THE MANAGERS WILL PROVIDE RADIOS FOR TOWER COMMUNICATION AND AN ESCORT FOR SITE ACCESS. TELEPHONE (301) 791-3333. THE BASE LINE IS A NORTH-NORTHEAST, SOUTH-SOUTHWEST LINE WITH THE 0-METER POINT ON THE NORTH-NORTHEAST END. IT CONSISTS OF THE 0, 150, 425, AND 1160 METER POINTS WITH A 100-FOOT TAPE CALIBRATION STATION LOCATED OFF LINE AND WEST-NORTHWEST OF THE 0-METER POINT. TO REACH THE 0-METER POINT FROM THE JUNCTION OF INTERSTATE HIGHWAYS 81 AND 70, LOCATED SOUTHWEST OF HAGERSTOWN, GO NORTH ON INTERSTATE HIGHWAY 81 FOR 10.8 KM (6.7 MI) TO INTERSTATE HIGHWAY 81 EXIT RAMP 10A. TAKE THE EXIT RAMP AND GO NORTHEAST FOR 0.4 KM (0.2 MI) TO THE REVERSE FORK OF SHOWALTER ROAD. BEAR RIGHT AND GO EASTERLY ON SHOWALTER ROAD FOR 0.53 KM (0.33 MI) TO THE ENTRANCE DRIVE FOR THE WASHINGTON COUNTY REGIONAL AIRPORT TERMINAL ON THE LEFT. TURN LEFT AND GO NORTH CURVING TO WEST ON THE TERMINAL ROAD FOR 0.4 KM (0.2 MI) TO THE MAIN ENTRANCE FOR THE AIRPORT TERMINAL AND AIRPORT MANAGERS OFFICE LOCATED WITHIN. **NOTE** THE MANAGERS WILL PROVIDE AN ESCORT TO GUIDE USERS ACROSS ACTIVE AIRCRAFT AREAS TO THE 0-METER POINT, LOCATED JUST EAST OF THE NORTHEASTERN CORNER OF RUNWAY (2-20). THE 0-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "0 MTS. 1977" SET IN THE TOP OF A 38 CM (15 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 66.0 M (216.5 FT) NORTH OF THE NORTHERN EDGE OF A CONCRETE TAXIWAY, 38.2 M (125.3 FT) EAST OF THE EASTERN MOST RUNWAY END LIGHT, 37.5 M (123.0 FT) WEST-NORTHWEST OF THE SOUTHWEST CORNER OF A TALL CHAIN LINK FENCE, AND 15.1 M (49.5 FT) SOUTHEAST OF THE CENTER OF A RUNWAY END STROBE LIGHT. THE 150-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "150 MTS. 1977" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 2.5 CM (1 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 67.0 M (219.8 FT) SOUTH OF THE SOUTHERN EDGE OF A CONCRETE TAXIWAY, 43.1 M (141.4 FT) WEST-NORTHWEST OF THE WESTERN EDGE OF A CONCRETE AIRCRAFT PARKING AREA, AND 37.8 M (124.0 FT) EAST-SOUTHEAST OF THE EASTERN EDGE OF RUNWAY (2-20). THE 425-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "425 MTS. 1977" SET IN THE TOP OF A 25 CM (10 IN) SQUARE CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 40.2 M (131.9 FT) SOUTH OF THE CENTERLINE OF A PAVED ROAD, 37.8 M (124.0 FT) EAST-SOUTHEAST OF THE EASTERN EDGE OF RUNWAY (2-20), AND 20.6 M (67.6 FT) NORTH OF THE NORTHERN EDGE OF RUNWAY (9-27). 1THE 1160-METER POINT IS A MARYLAND STATE HIGHWAY ADMINISTRATION DISK STAMPED "1160 MTS. 1977" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 5 CM (2 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 45.3 M (148.6 FT) SOUTH OF THE CENTER OF A RUNWAY END STROBE LIGHT, 23.5 M (77.1 FT) NORTH OF THE PERIMETER FENCE, AND 22.9 M (75.1 FT) WEST-NORTHWEST OF A TALL CHAIN LINK FENCE. THE 100-FOOT TAPE CALIBRATION STATION IS A BLANK DISK STAMPED "100 FT" SET IN THE TOP OF AN 82 CM (32 IN) DIAMETER CONCRETE POST PROJECTING 2.5 CM (1 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 38.5 M (126.3 FT) EAST OF THE NORTHWESTERN CORNER OF RUNWAY (2-20), 16.1 M (52.8 FT) WEST OF THE CENTER OF A RUNWAY END STROBE LIGHT, AND 11.2 M (36.7 FT) NORTHEAST OF THE EASTERN MOST RUNWAY END LIGHT. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. COMMUNICATION FOR GROUND ACTIVITIES MUST BE MAINTAINED WITH THE AIR-TRAFFIC-CONTROLLERS. THIS BASELINE DOES NOT MEET CURRENT NGS SITE SPECIFICATIONS. THIS CALIBRATION BASE LINE WAS ESTABLISHED AND REMEASURED WITH ASSISTANCE FROM THE MARYLAND DEPARTMENT OF TRANSPORTATION. FOR MORE INFORMATION PLEASE CONTACT MR. RALPH POUST, FIELD OPERATIONS, PLATS AND SURVEYS DIVISION, MD DOT, 707 NORTH CALVERT STREET, BALTIMORE, MD 21202. TELEPHONE 410-333-1240. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N390762 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: HARFORD CBL MARYLAND SILVER SPRING MD 20910 - November 13, 1999 PROJECT ACCESSION NUMBER: 16044 HARFORD COUNTY NEAREST TOWN: ABERDEEN LIST OF ADJUSTED DISTANCES (October 27, 1999) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 M 1999 19.530 150 M 1999 17.966 149.9530 149.9612 0.2 0 M 1999 19.530 400 M 1999 15.438 400.1092 400.1301 0.3 0 M 1999 19.530 1002 M 1999 15.684 1001.9794 1001.9868 0.4 150 M 1999 17.966 400 M 1999 15.438 250.1562 250.1689 0.2 150 M 1999 17.966 1002 M 1999 15.684 852.0263 852.0293 0.3 400 M 1999 15.438 1002 M 1999 15.684 601.8700 601.8700 0.2 DESCRIPTION OF HARFORD COUNTY BASE LINE YEAR MEASURED: 1999 LATITUDE: 39 29 04 LONGITUDE: 076 09 37 AZIMUTH: 304 DEGREES TRUE NORTH CHIEF OF PARTY: DMM THE BASE LINE IS LOCATED ON THE ABERDEEN PROVING GROUNDS ARMY BASE IN HARFORD COUNTY MARYLAND ABOUT 1.6 KM (1.0 MI) EAST OF THE CITY OF ABERDEEN AND JUST EAST OF THE JUNCTION OF U.S. HIGHWAY 40 AND STATE ROUTE 715 (MARYLAND AVENUE) ON THE SOUTH SIDE OF MARYLAND AVENUE AT THE NORTH EDGE OF THE GOLF COURSE AND JUST NORTH OF A POWER LINE RUNNING BETWEEN THE GOLF COURSE AND MARYLAND AVENUE. THE BASE LINE IS AN SOUTHEAST-NORTHWEST LINE WITH THE 0-METER POINT ON THE SOUTHEAST END. IT CONSISTS OF THE 0, 150, 400, AND 1002 METER POINTS. THERE IS NO 100-FOOT TAPE CALIBRATION STATION LOCATED AT THIS BASE LINE. TO REACH THE 0-METER POINT FROM INTERSTATE HIGHWAY 95, TAKE EXIT 80 (CRESSWELL ROAD) GOING SOUTH. TURN NORTHEAST ON STATE ROUTE 7 AND PROCEED FOR 5.6 KM (3.5 MI) TO THE JUNCTION WITH U.S. HIGHWAY 40. TURN LEFT AND PROCEED NORTHEAST ON U.S. HIGHWAY 40 FOR 1.6 KM (1.0 MI) TO SHORT LANE ROAD. TURN RIGHT ON SHORT LANE ROAD AND GO EAST TO THE ENTRANCE GATE TO THE BASE. ON THE BASE THE ROAD NAME CHANGES TO MARYLAND AVENUE. TO REACH THE O METER POINT FROM THE GUARD STATION (BUILDING 5655) GO SOUTH ON MARYLAND AVENUE FOR 0.8 KM (0.5 MI) TO THE MONUMENT ON THE RIGHT ATOP A BERM ON THE SOUTH SIDE OF A DITCH JUST WEST OF THREE SMALL TREES. THE 0-METER POINT IS A STANDARD NATIONAL GEODETIC SURVEY (NGS) CALIBRATION BASE LINE DISK, STAMPED "0 M 1998" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST 0.05 M (0.16 FT) BELOW THE SURFACE OF THE GROUND. IT IS 8.0 M (26.3 FT) WEST FROM THE CENTER OF THE MOST WESTERLY OF THREE SMALL TREES, 8.75 M (28.71 FT) SOUTHEAST OF A POWER POLE NUMBER 56A2, 10.7 M (35.1 FT) SOUTH OF THE SOUTH EDGE OF THE ROAD, AND 10.8 M (35.43 FT) NORTHWEST OF A GAS PIPELINE MARKER. THE 150-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK, STAMPED "150 M 1998" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST 0.05 M (0.16 FT) BELOW THE SURFACE OF THE GROUND. IT IS 0.6 KM (0.4 MI) SOUTHEAST OF GUARD STATION (BUILDING 5655) ON THE SOUTH SIDE OF MARYLAND AVENUE BETWEEN THE DITCH ALONG THE ROAD AND A POWER LINE RUNNING ON THE NORTH SIDE OF THE GOLF COURSE, 5.3 M (17.4 FT) NORTH OF THE LINE FORMED BY THE POWER POLES, 15.82 M (51.90 FT) SOUTH OF THE SOUTH EDGE OF THE ROAD, 17.95 M (58.89 FT) SOUTHEAST OF POWER POLE NUMBER 56A5 AND 35.75 M (117.29 FT) NORTHWEST OF POWER POLE NUMBER 56A4. THE 400-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK, STAMPED "400 M 1998" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST 0.05 M (0.16 FT) BELOW THE SURFACE OF THE GROUND. IT IS 0.40 KM (0.25 MI) SOUTHEAST OF GUARD STATION (BUILDING 5655) ON THE SOUTH SIDE OF MARYLAND AVENUE BETWEEN THE ROAD AND A POWER LINE RUNNING EAST-WEST AT THE NORTH SIDE OF THE GOLF COURSE, IT IS 7.7 M (25.3 FT) NORTH OF THE LINE FORMED BY THE POWER POLES, 17.5 M (57.4 FT) FROM THE CENTER OF A TREE, 20.75 M (68.08 FT) NORTHWEST OF POWER POLE NUMBER 56A9, 24.2 M (79.4 FT) SOUTH OF THE SOUTH EDGE OF THE ROAD AND 36.25 M (118.93 FT) NORTHEAST OF POWER POLE NUMBER 56A10. 1THE 1002-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK, STAMPED "1000 M 1998" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST 0.05 M (0.16 FT) BELOW THE SURFACE OF THE GROUND. TO REACH THE 1000 METER POINT FROM THE GUARD STATION (BUILDING 5655) AFTER PASSING THE ENTRY GATE TURN HARD RIGHT ONTO A GRAVEL ROAD RUNNING EAST-WEST AND PARALLEL WITH THE PERIMETER FENCE. THE GRAVEL ROAD CONNECTS TO THE WEST END OF A PAVED PARKING AREA ON THE SOUTH SIDE OF THE ROAD AND JUST BEYOND THE GUARD STATION. DRIVE WEST ON THE GRAVEL ROAD PAST ITS INTERSECTION WITH ANOTHER GRAVEL ROAD LEADING SOUTH. THE MONUMENT IS LOCATED IN THE GRASS ISLAND FORMED BY THE TWO GRAVEL ROADS AND AN ELECTRIC SUBSTATION. IT IS 9.9 M (32.5 FT) SOUTH OF THE SOUTH EDGE OF THE GRAVEL ROAD RUNNING EAST-WEST, 16.76 M (54.99 FT) SOUTH OF THE CHAIN LINK FENCE, 17.3 M (56.8 FT) NORTHWEST OF AN ELECTRICAL BOX PEDESTAL ALONG THE GRAVEL ROAD LEADING SOUTH, 23.72 M (77.82 FT) EAST OF POWER POLE NUMBER 56A21, AND 41.37 M (135.73 FT) EAST-SOUTHEAST OF THE NORTHEAST CORNER OF A FENCE AROUND THE SUBSTATION. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THIS CALIBRATION BASE LINE WAS ESTABLISHED WITH ASSISTANCE FROM THE MARYLAND DEPARTMENT OF TRANSPORTATION, STATE HIGHWAY ADMINISTRATION. FOR MORE INFORMATION PLEASE CONTACT DON BAUMGARTNER, MARYLAND DEPARTMENT OF TRANSPORTATION, STATE HIGHWAY ADMINISTRATION, SURVEY SECTION, P.O. BOX 2679, SALISBURY, MD 21802. TELEPHONE 410-376-3616 OR CONTACT MR. DONALD MULCARE, NGS STATE ADVISOR, MARYLAND STATE HIGHWAY ADMINISTRATION, PLATS AND SURVEYS DIVISION, MAIL STOP M-101, 707 NORTH CALVERT STREET, BALTIMORE, MD 21202. TELEPHONE 410-545-8963 (EMAIL dmulcare@ibm.net). 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N390763 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: CLARKSVILLE CBL MARYLAND ROCKVILLE MD 20852 PROJECT ACCESSION NUMBER: 16044 HOWARD COUNTY NEAREST TOWN: CLARKSVILLE LIST OF ADJUSTED DISTANCES (JUNE 2, 1988) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 111.349 150 110.373 149.9884 149.9916 0.1 0 111.349 425 111.693 424.9964 424.9966 0.4 0 111.349 1100 117.614 1099.9854 1100.0032 0.6 150 110.373 425 111.693 275.0080 275.0112 0.4 150 110.373 1100 117.614 949.9968 950.0244 0.6 425 111.693 1100 117.614 674.9888 675.0147 0.4 DESCRIPTION OF HOWARD COUNTY BASE LINE YEAR MEASURED: 1988 CHIEF OF PARTY: MTL THIS BASE LINE IS LOCATED 5.3 KM (3.3 MI) NORTH OF CLARKSVILLE, 10.1 KM (6.3 MI) EAST-SOUTHEAST OF ELLICOTT CITY, AND ALONG THE EAST EDGE OF FOLLY QUARTER ROAD AT THE UNIVERSITY OF MARYLAND CENTRAL FARM. TO REACH THE BASE LINE FROM THE POST OFFICE IN CLARKSVILLE ON STATE HIGHWAY 108, GO NORTHEAST FOR 0.8 KM (0.5 MI) ON STATE HIGHWAY 108 TO SHEPPARD LANE. TURN LEFT ON SHEPPARD LANE AND GO NORTHERLY FOR 4.3 KM (2.7 MI) TO AN INTERSECTION WITH HOMEWOOD ROAD. CONTINUE STRAIGHT ONTO FOLLY QUARTER ROAD FOR 0.24 KM (0.15 MI) TO THE 0 METER POINT ON THE RIGHT. THE BASE LINE IS A SOUTHWEST-NORTHEAST LINE WITH THE 0 METER POINT ON THE SOUTHWEST END. THE BASE LINE CONSISTS OF THE 0, 150, 425, AND 1100 METER POINT, WITH A 100 FT TAPING STATION IN LINE AND NORTH OF THE 1100 METER POINT. ALL POINTS ARE SET ON A LINE WHICH RUNS PARALLEL TO AND EAST OF FOLLY QUARTER ROAD. THE 0 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "0 POINT 1988", SET IN THE TOP OF A 48 CM (18.9 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 0.9 METERS NORTHEAST OF WITNESS POST AND TELEPHONE POLE, AND 5.9 METERS (19.5 FT) SOUTHEAST OF THE CENTERLINE OF FOLLY QUARTER ROAD. THE 150 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "150 M 1988", SET IN THE TOP OF 40 CM (16 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 6.6 METERS (21.6 FT) NORTHEAST OF A WITNESS POST AND TELEPHONE POLE, AND 7.5 METERS (24.6 FT) SOUTHEAST OF THE CENTERLINE OF FOLLY QUARTER ROAD. THE 425 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "425 M 1988", SET IN THE TOP OF A 50 CM (20 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 37.1 METERS (121.6 FT) NORTHEAST OF A WITNESS POST AND TELEPHONE POLE, 11.9 METERS (39 FT) SOUTHEAST OF THE CENTERLINE OF FOLLY QUARTER ROAD, AND 40.4 METERS (132.5 FT) NORTHEAST OF A PAVED ROAD. THE 1100 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "1100 M 1988", SET IN THE TOP OF A 26 CM (10 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 11.2 METERS (36.7 FT) NORTHEAST OF A WITNESS POST AND TELEPHONE POLE, AND 11.2 METERS (25.6 FT) SOUTHEAST OF THE CENTERLINE OF FOLLY QUARTER ROAD. USER NOTES: CBL USERS SHOULD TAKE TRAFFIC SAFETY PRECAUTIONS DUE TO CLOSE PROXIMITY TO BUSY ROAD. ALL POINT ELEVATIONS ARE FOR BASE LINE USE ONLY. CARE SHOULD BE TAKEN IN PLUMBING OVER POINTS. THIS BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH HOWARD COUNTY DEPARTMENT OF PUBLIC WORKS AND MARYLAND STATE HIGHWAY DEPARTMENT. FOR MORE INFORMATION, PLEASE CONTACT MR. JEFF HOBBS, SURVEY DIVISION, HOWARD COUNTY DEPARTMENT OF PUBLIC WORKS, PUBLIC WORKS ANNEX, 11226 ROUTE 216, LAUREL, MARYLAND, 20707, TEL.(301) 792-7272. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N380763 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: LEONARDTOWN CBL MARYLAND ROCKVILLE MD 20852 PROJECT ACCESSION NUMBER: 16044 ST. MARYS COUNTY NEAREST TOWN: LEONARDTOWN LIST OF ADJUSTED DISTANCES (JUNE 2, 1988) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 38.873 150 39.254 149.9948 149.9953 0.1 0 38.873 425 40.374 425.0069 425.0096 0.3 0 38.873 1100 42.979 1099.9928 1100.0005 0.4 150 39.254 425 40.374 275.0122 275.0144 0.3 150 39.254 1100 42.979 949.9980 950.0053 0.4 425 40.374 1100 42.979 674.9858 674.9909 0.3 DESCRIPTION OF LEONARDTOWN BASE LINE YEAR MEASURED: 1988 CHIEF OF PARTY: MTL THE BASE LINE IS LOCATED 9.8 KM (6.1 MI) NORTHWWEST OF LEXINGTON PARK, 7.2 KM (4.5 MI) NORTHEAST OF LEANARDTOWN, 3.2 KM (2.0 MI) SOUTHEAST OF HOLLYWOOD, ON THE NORTH SECTION OF ST. MARY'S COUNTY AIRPORT, AND ON A LINE WHICH RUNS PARLLEL TO AND NORTH OF THE RUNWAY. TO REACH THE BASE LINE FROM THE INTESECTION OF STATE HIGHWAYS 4 AND 235, WHICH IS ABOUT 6.4 KM (4.0 MI) NORTHWEST OF LEXINGTON PARK, GO NORTHWEST ON STATE HIGHWAY 235 FOR 1.6 KM (1.0 MI) TO A SIDE ROAD LEFT, AIRPORT ROAD. TURN LEFT AND GO WEST ON AIRPORT ROAD FOR 1.6 KM (1.0 MI) TO THE ST. MARY'S COUNTY AIRPORT ENTRANCE ON THE RIGHT AND THE ADMINISTRATION BUILDING. TURN RIGHT AND GO NORTH TO AN ACCESS GATE. CONTINUE NORTH THROUGH THE GATE FOR 60 METERS (200 FT) TO A T-INTERSECTION AT THE NORTH EDGE OF THE AIRPORT PARKING AREA AND A PAVED TAXIWAY. TURN RIGHT AND GO EAST ON THE PAVED TAXIWAY FOR 60 METERS (200 FT) TO A PAVED ACCESS STRIP TO THE MAIN TAXIWAY. TURN LEFT AND GO NORTH ON THE ACCESS STRIP FOR 15 METERS (50 FT) TO THE MAIN TAXIWAY. TURN RIGHT AND GO EAST ON THE MAIN TAXIWAY FOR 0.5 KM 0.3 MI TO THE EAST END OF THE TAXIWAY. TURN LEFT AND GO NORTHEAST ONTO THE GRASS FOR ABOUT 60 METERS (200 FT) TO WITNESS POST AND THE 0 METER POINT. THE BASE LINE IS AN EAST-WEST LINE WITH THE 0 METER POINT AT THE EAST END. THE BASE LINE IS A FOUR POINT LINE WHICH CONSISTS OF THE 0, 150, 425, AND 1100 METER POINTS WITH A 100 FT TAPE STATION OFF-LINE AND NORTHEAST OF THE 0 METER POINT. THE LINE RUNS PARALLEL AND NORTH OF THE RUNWAY. THE 0 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "0 M 1988", SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 0.8 METERS (2.50 FT) SOUTH OF A WITNESS POST, 62.5 METERS (205.2 FT) EAST OF THE NORTHEAST CORNER OF THE RUNWAY, AND 48.3 METERS (158.5 FT) SOUTH OF A WIRE FENCE. THE 150 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "150 M 1988", SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 0.8 METERS (2.7 FT) SOUTH OF A WITNESS POST, 25.6 METERS (84.0 FT) NORTH OF NORTH RUNWAY EDGE, AND 46.6 METERS (152.8 FT) SOUTH OF A WIRE FENCE. THE 425 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "425 M 1988", SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 0.8 METERS (2.6 FT) SOUTH OF A WITNESS POST, 28.3 METERS (93.0 FT) NORTH OF NORTH RUNWAY EDGE, 47.0 METERS (154.3 FT) SOUTH OF A WIRE FENCE, AND 63.4 METERS (208 FT) SOUTH OF A WIND PLANE INDICATOR. THE 1100 METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISC, STAMPED "1100 M 1988", SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST FLUSH WITH THE GROUND, 0.9 METERS (2.9 FT) SOUTH OF A WITNESS POST, 19.2 METERS (63.6 FT) SOUTH OF A DITCH, AND 51.8 METERS (170 FT) TO THE NORTHWEST EDGE OF THE RUNWAY. 1USER NOTES: TO GAIN ACCESS TO THIS CBL, USERS SHOULD CONTACT THE AIRPORT MANAGER, (301) 373-2101, OR IN PERSON AT THE ADMINISTRATION BLDG. DURING BUSINESS HOURS. RUNWAY SHOULD NOT BE CROSSED AT ANYTIME, AND BE AWARE OF AIRCRAFT. ALL POINT ELEVATIONS ARE FOR BASE LINE USE ONLY. CARE SHOULD BE TAKEN TO PLUMB OVER POINTS. THIS BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE MARYLAND SOCIETY OF SURVEYORS. FOR MORE INFORMATION, PLEASE CONTACT MR. WILLIAM P. HIGGS, P.L.S., MCRONE, INC., COURT HOUSE DRIVE, P.O.BOX 207, LEONARDTOWN, MARYLAND, 20650. TEL.(301) 475-5522. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N380752 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: PITTSVILLE CBL MARYLAND ROCKVILLE MD 20852 PROJECT ACCESSION NUMBER: 16044 WICOMICO COUNTY NEAREST TOWN: PITTSVILLE LIST OF ADJUSTED DISTANCES (DECEMBER 3, 1991) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 14.727 150 13.550 150.0013 150.0059 0.1 0 14.727 430 13.397 430.0059 430.0080 0.2 0 14.727 1400 13.356 1400.0046 1400.0052 0.2 150 13.550 430 13.397 280.0046 280.0046 0.1 150 13.550 1400 13.356 1250.0031 1250.0032 0.2 430 13.397 1400 13.356 969.9986 969.9986 0.1 A TAPE CALIBRATION MONUMENT WAS SET AT THE 100 FOOT POINT OF THE BASE LINE. THE REDUCED MARK TO MARK DISTANCE IS 100.00 FT. DESCRIPTION OF PITTSVILLE BASE LINE YEAR MEASURED: 1991 CHIEF OF PARTY: CRG THE BASE LINE IS LOCATED ABOUT 17.7 KM (11.0 MI) EAST OF SALISBURY AND 2.0 KM (1.25 MI) SOUTHEAST OF PITTSVILLE. THE BASE LINE LIES IN THE WOODED MEDIUM STRIP BETWEEN THE EASTBOUND AND WESTBOUND LANES OF U.S. HIGHWAY 50. THE BASE LINE IS AN EAST-WEST LINE WITH THE 0-METER POINT ON THE WEST END. IT CONSISTS OF THE 0, 150, 430, AND 1400 METER POINTS WITH A 100-FOOT TAPE CALIBRATION STATION LOCATED EAST OF THE 0-METER POINT AND SLIGHTLY OFF LINE TO THE SOUTH. TO REACH THE 0-METER POINT FROM THE INTERSECTION OF U.S. HIGHWAYS 13 AND 50, LOCATED ON THE EAST SIDE OF SALISBURY, GO EASTERLY ON HIGHWAY 50 FOR 0.9 KM (0.6 MI) TO THE INTERSECTION OF HOBBS ROAD. CONTINUE EASTERLY ON HIGHWAY 50 FOR 5.1 KM (3.2 MI) TO THE INTERSECTION OF FOREST GROVE ROAD. CONTINUE EASTERLY ON HIGHWAY 50 FOR 6.6 KM (4.1 MI) TO THE INTERSECTION OF WHITE RICHARDSON ROAD, AND THE 0-METER POINT AHEAD ON THE LEFT. THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 1990" SET IN THE TOP OF A 33 CM (13 IN) DIAMETER CONCRETE POST RECESSED 2.5 CM (1 IN) BELOW THE SURFACE OF THE GROUND. IT IS 30.8 M (101.0 FT) WEST OF A FIBERGLASS WITNESS POST, 27.1 M (88.9 FT) SOUTH OF THE CENTERLINE OF THE WESTBOUND LANES OF HIGHWAY 50, 27.0 M (88.6 FT) NORTH OF THE CENTERLINE OF THE EASTBOUND LANES OF HIGHWAY 50, AND 11.4 M (37.4 FT) EAST OF THE CENTERLINE OF WHITE RICHARDSON ROAD. THE MARK IS ABOUT 0.9 M (2.9 FT) LOWER THAN THE HIGHWAY. THE 150-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "150 1990" SET IN THE TOP OF A 33 CM (13 IN) DIAMETER CONCRETE POST RECESSED 10 CM (4 IN) BELOW THE SURFACE OF THE GROUND. IT IS 27.1 M (88.9 FT) SOUTH OF THE CENTERLINE OF THE WESTBOUND LANES OF HIGHWAY 50, 26.9 M (88.3 FT) NORTH OF THE CENTERLINE OF THE EASTBOUND LANES OF HIGHWAY 50, AND 6.1 M (20.0 FT) SOUTH OF A FIBERGLASS WITNESS POST. THE MARK IS ABOUT 1.7 M (5.6 FT) LOWER THAN THE HIGHWAY. THE 430-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "430 1990" SET IN THE TOP OF A 33 CM (13 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 27.1 M (88.9 FT) SOUTH OF THE CENTERLINE OF THE WESTBOUND LANES OF HIGHWAY 50, 27.0 M (88.6 FT) NORTH OF THE CENTERLINE OF THE EASTBOUND LANES OF HIGHWAY 50, AND 3.4 M (11.2 FT) SOUTH OF A FIBERGLASS WITNESS POST. THE MARK IS ABOUT 1.3 M (4.3 FT) LOWER THAN THE HIGHWAY. THE 1400-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "1400 1990" SET IN THE TOP OF A 36 CM (14 IN) DIAMETER CONCRETE POST RECESSED 10 CM (4 IN) BELOW THE SURFACE OF THE GROUND. IT IS 27.1 M (88.9 FT) SOUTH OF THE CENTERLINE OF THE WESTBOUND LANES OF HIGHWAY 50, 27.1 M (88.9 FT) NORTH OF THE CENTERLINE OF THE EASTBOUND LANES OF HIGHWAY 50, AND 1.9 M (6.2 FT) SOUTH OF A FIBERGLASS WITNESS POST. THE MARK IS ABOUT 1.1 M (3.6 FT) LOWER THAN THE HIGHWAY. 1THE 100-FOOT TAPE CALIBRATION STATION IS A STANDARD NGS CALIBRATION BASE LINE TAPING DISK STAMPED "100 FT" SET IN THE TOP OF A 36 CM (14 IN) DIAMETER CONCRETE POST RECESSED 10 CM (4 IN) BELOW THE SURFACE OF THE GROUND. IT IS 29.8 M (97.8 FT) SOUTH OF THE CENTERLINE OF THE WESTBOUND LANES OF HIGHWAY 50, 24.3 M (79.7 FT) NORTH OF THE CENTERLINE OF THE EASTBOUND LANES OF HIGHWAY 50, AND 3.8 M (12.5 FT) NORTH OF A FIBERGLASS WITNESS POST. THE MARK IS ABOUT 1.2 M (3.9 FT) LOWER THAN THE HIGHWAY. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THIS CALIBRATION BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE EASTERN SHORE SOCIETY OF SURVEYORS AND THE MARYLAND STATE HIGHWAY ADMINISTRATION. FOR MORE INFORMATION CONTACT MR. RALPH POUST, MARYLAND STATE HIGHWAY ADM., P.O. BOX 717, 707 NORTH CALVERT STREET, BALTIMORE, MD 21202. TELEPHONE (301) 333-1240. OR CONTACT MR. JOHN ANDREWS, 226 NORTH DIVISION STREET, SALISBURY, MD 21801. TELEPHONE (301) 742-4673. OR CONTACT MR. DON BAUMGARTNER, MARYLAND STATE HIGHWAY ADM., P.O. BOX 2679, SALISBURY, MD 21802-2679. TELEPHONE (301) 543-6715.