STATE OF VIRGINIA 1 CONTENTS BASE LINE DESIGNATION STATE COUNTY QUAD CORBIN CBL (1991 REMEASURED) VIRGINIA CAROLINE N380772 EPG BASE VIRGINIA FAIRFAX N380772 NORFOLK CBL (1993 VERIFIED) VIRGINIA CITY OF NORFOLK N360761 VIRGINIA TECH VIRGINIA MONTGOMERY N370802 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N380772 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: CORBIN CBL VIRGINIA ROCKVILLE MD 20852 PROJECT ACCESSION NUMBER: 15767 CAROLINE COUNTY NEAREST TOWN: CORBIN LIST OF ADJUSTED DISTANCES (JANUARY 16, 1992) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) CORBIN WEST BASE 66.720 50 M 66.909 50.0052 50.0056 0.0 CORBIN WEST BASE 66.720 300 M 65.516 300.0004 300.0029 0.1 CORBIN WEST BASE 66.720 500 M 64.054 499.9940 500.0011 0.1 CORBIN WEST BASE 66.720 1000 M 64.943 1000.0203 1000.0219 0.1 50 M 66.909 300 M 65.516 249.9952 249.9991 0.1 50 M 66.909 500 M 64.054 449.9888 449.9979 0.1 50 M 66.909 1000 M 64.943 950.0151 950.0172 0.1 300 M 65.516 500 M 64.054 199.9936 199.9989 0.1 300 M 65.516 1000 M 64.943 700.0198 700.0201 0.1 500 M 64.054 1000 M 64.943 500.0262 500.0270 0.1 DESCRIPTION OF CORBIN BASE LINE YEAR MEASURED: 1976 - 1982 YEAR REMEASURED: 1991 CHIEF OF PARTY: VARIOUS THE BASE LINE IS LOCATED APPROXIMATELY 10 MILES NORTH OF BOWLING GREEN, NINE MILES SOUTH-SOUTHEAST OF FREDERICKSBURG AND 0.6 MILE EAST OF CORBIN, VIRGINIA. THE BASE LINE IS SITUATED ON U.S. GOVERNMENT PROPERTY AT THE SITE OF THE FREDERICKSBURG GEOMAGNETIC CENTER AND THE OFFICE OF THE INSTRUMENT AND EQUIPMENT BRANCH OF THE NATIONAL GEODETIC SURVEY. TO REACH THE INSTRUMENT AND EQUIPMENT BRANCH OFFICE OF THE NATIONAL GEODETIC SURVEY FROM THE JUNCTION OF U.S. HIGHWAY 17 SOUTH BYPASS AND VIRGINIA STATE HIGHWAY 2 WHICH IS APPROXIMATELY 6.5 MILES SOUTH OF FREDERICKSBURG, GO SOUTH ON STATE HIGHWAY 2 FOR 2.35 MILES TO A STORE ON THE LEFT AND A SIDE ROAD LEFT, JUST BEYOND THE STORE IN THE SMALL SETTLEMENT OF CORBIN. TURN LEFT AND GO SOUTHEAST AND EAST ON STATE HIGHWAY 610 FOR 0.4 MILE TO WHERE THE HIGHWAY BEARS SHARP LEFT AND A SECONDARY ROAD (BURMA ROAD) GOES STRAIGHT AHEAD. CONTINUE EAST ON BURMA ROAD (U.S. PROPERTY) FOR 0.3 MILE TO A CIRCLE DRIVEWAY ON THE LEFT. TURN LEFT AND GO NORTH AND EAST ON THE DRIVEWAY FOR 0.1 MILE TO THE OFFICE OF THE INSTRUMENT AND EQUIPMENT BRANCH ON THE LEFT WHERE INFORMATION CONCERNING THE LOCATION OF THE BASE LINE CAN BE OBTAINED. THE HORIZONTAL LENGTH OF THE BASE LINE IS 1000 METERS. IT IS MONUMENTED AT 0M, 50M, 300M, 500M, 925M, AND 1000M. EACH MONUMENT IS OF POURED CONCRETE SET INTO A DEPTH OF FIVE FEET. THE MONUMENTS PROTRUDE TWO INCHES ABOVE THE GROUND SURFACE AND TAPER FROM 18 INCHES IN DIAMETER AT THE BOTTOM TO 10 INCHES SQUARE AT THE TOP. THERE IS A BRONZE DISK SET IN THE TOP OF EACH CONCRETE MONUMENT AND THE EXACT POINT IS A 0.4 MILLIMETER DIAMETER DRILLED HOLE IN THE CENTER OF THE DISKS. EACH MONUMENT HAS OVER IT A PERMANENT FOUR LEGGED ANODIZED ALUMINUM INSTRUMENT STAND. THE STANDS ARE FITTED WITH 12 INCH CIRCULAR TRIBRACHS WITH A 3/4 INCH DIAMETER HOLE IN THEIR CENTER. THE TRIBRACHS ARE ADJUSTABLE FOR COLLIMATING PURPOSES. EACH POINT ON THE BASE LINE IS VISIBLE FROM ANY OTHER POINT ON THE BASE. EACH POINT CAN BE DRIVEN TO IN ANY TWO-WHEEL DRIVE VEHICLE IN ANY WEATHER. CORBIN BASE LINE WAS ESTABLISHED PRIMARILY FOR USE BY THE NATIONAL GEODETIC SURVEY FOR THE CALIBRATION AND TESTING OF ELECTRONIC DISTANCE MEASURING INSTRUMENTS. ARRANGEMENTS FOR USE OF THE BASE LINE CAN BE MADE BY CONTACTING: WILLIAM V. MAST OR CHARLES C. GLOVER, INSTRUMENT AND EQUIPMENT BRANCH, NATIONAL GEODETIC SURVEY, NATIONAL OCEAN SURVEY, NOAA, P.O. BOX 1, CORBIN, VIRGINIA 22446. PHONE: COMMERCIAL NO. (703) 373-7605 OR FTS NO. (925) 0243-0244. 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N380772 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: EPG BASE VIRGINIA ROCKVILLE MD 20852 - APRIL 29, 1987 PROJECT ACCESSION NUMBER: G15767 FAIRFAX COUNTY NEAREST TOWN: NEWINGTON LIST OF ADJUSTED DISTANCES (MARCH 18, 1987) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 91.440 101 91.531 101.2057 101.2057 0.3 0 91.440 201 91.288 201.4486 201.4487 0.3 0 91.440 351 91.036 351.4116 351.4119 0.3 0 91.440 501 91.259 501.3367 501.3368 0.3 0 91.440 651 91.225 651.3590 651.3591 0.3 0 91.440 751 91.098 751.5546 751.5546 0.4 0 91.440 851 90.917 851.3155 851.3156 0.4 0 91.440 911 90.942 911.3083 911.3084 0.4 101 91.531 201 91.288 100.2429 100.2432 0.3 101 91.531 351 91.036 250.2060 250.2065 0.3 101 91.531 501 91.259 400.1311 400.1312 0.3 101 91.531 651 91.225 550.1534 550.1535 0.3 101 91.531 751 91.098 650.3489 650.3491 0.3 101 91.531 851 90.917 750.1098 750.1101 0.3 101 91.531 911 90.942 810.1026 810.1028 0.4 201 91.288 351 91.036 149.9630 149.9632 0.3 201 91.288 501 91.259 299.8881 299.8881 0.2 201 91.288 651 91.225 449.9104 449.9104 0.2 201 91.288 751 91.098 550.1060 550.1060 0.3 201 91.288 851 90.917 649.8669 649.8670 0.3 201 91.288 911 90.942 709.8597 709.8598 0.3 351 91.036 501 91.259 149.9251 149.9253 0.2 351 91.036 651 91.225 299.9474 299.9474 0.2 351 91.036 751 91.098 400.1429 400.1429 0.3 351 91.036 851 90.917 499.9038 499.9038 0.3 351 91.036 911 90.942 559.8966 559.8966 0.3 501 91.259 651 91.225 150.0223 150.0223 0.1 501 91.259 751 91.098 250.2178 250.2179 0.2 501 91.259 851 90.917 349.9787 349.9789 0.2 501 91.259 911 90.942 409.9716 409.9717 0.3 651 91.225 751 91.098 100.1955 100.1956 0.2 651 91.225 851 90.917 199.9564 199.9567 0.2 651 91.225 911 90.942 259.9493 259.9494 0.3 751 91.098 851 90.917 99.7609 99.7611 0.3 751 91.098 911 90.942 159.7537 159.7538 0.3 851 90.917 911 90.942 59.9928 59.9928 0.3 DESCRIPTION OF EPG BASE BASE LINE YEAR MEASURED: 1987 CHIEF OF PARTY: CCG 1THE BASE LINE IS LOCATED ABOUT 3.7 KM (2.3 MILES) SOUTHWEST OF FRANCONIA, 3.2 KM (2 MILES) SOUTHEAST OF WEST SPRINGFIELD, 1.6 KM (1 MILE) NORTH-NORTHWEST OF NEWINGTON AND 0.5 KM (0.3 MILE) WEST OF U.S. INTERSTATE HIGHWAY 95. IT IS ON THE GROUNDS OF THE FORT BELVOIR ENGINEER PROVING GROUNDS. TO REACH THE BASE LINE FROM THE MAIN GATE OF THE PROVING GROUNDS AT 7500 BACK LICK ROAD (VIRGINIA STATE ROAD 617), GO WEST ON MACADAM ROAD FOR 0.2 KM (0.1 MILE) TO A SIDE ROAD RIGHT, GO RIGHT AND NORTH ON MACADAM ROAD FOR 0.2 KM (0.1 MILE) TO A DIRT ROAD LEFT. GO LEFT AND NORTH-NORTHWEST ON DIRT ROAD FOR 0.2 KM (0.1 MILE) TO EAST END OF BASE LINE AND THE 0 METER POINT. THE BASE LINE IS AN EAST-WEST LINE WITH 9 MONUMENTED POINTS LOCATED AT 0, 101, 201, 351, 501, 651, 751, 851, AND 911 METERS. ALL MARKS ARE STANDARD U.S. ARMY CORPS OF ENGINEERS SURVEY DISKS SET IN THE TOP OF POURED CONCRETE MONUMENTS WHICH ARE 18 CM (7 INCHES) SQUARE AND ABOUT 2.5 CM (1 INCH) BELOW GROUND LEVEL. THE DISKS ARE STAMPED BEGINNING WITH THE 0 METER MONUMENT B-1, B-2, B-3, B-4, B-5, B-6, B-7, B-8, B-9. FOR INFORMATION CONCERNING ACCESS TO AND USE OF THE BASE LINE, CONTACT MR. MARK H. THOMAS, FORT BELVOIR RD&E CENTER, STRBEJCT, FORT BELVOIR, VIRGINIA. TELEPHONE: AUTOVON 354-6784, COMMERCIAL (703) 664-6784. 1US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N360761 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: NORFOLK CBL VIRGINIA ROCKVILLE MD 20852 - MAY 3, 1993 PROJECT ACCESSION NUMBER: G15767 CITY OF NORFOLK NEAREST TOWN: NORFOLK LIST OF ADJUSTED DISTANCES (SEPTEMBER 22, 1980) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 4.37 150 4.40 150.0323 150.0323 0.2 0 4.37 798 4.23 797.7728 797.7728 0.4 0 4.37 1440 3.89 1440.0915 1440.0915 0.5 150 4.40 798 4.23 647.7405 647.7405 0.3 150 4.40 1440 3.89 1290.0591 1290.0592 0.5 798 4.23 1440 3.89 642.3187 642.3188 0.3 DESCRIPTION OF NORFOLK BASE LINE YEAR MEASURED: 1980 YEAR VERIFIED: 1993 CHIEF OF PARTY: KM A TAPE CALIBRATION MONUMENT IS SET 100 FEET FROM THE 0-METER POINT. THE REDUCED MARK-TO-MARK DISTANCE IS 30.483 M (100.01 FT). THE BASE LINE IS LOCATED ON THE NORTHEAST SIDE OF NORFOLK. THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE MEDIAN STRIP THAT SEPARATES THE NORTH AND SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD. THE BASE LINE IS A NORTH-SOUTH LINE WITH THE 0-METER POINT ON THE SOUTH END. IT CONSISTS OF THE 0, 150, 798, AND 1440 METER POINTS WITH A 100-FOOT TAPE CALIBRATION STATION LOCATED ON LINE AND NORTH OF THE 0-METER POINT. TO REACH THE 0-METER POINT FROM THE JUNCTION OF INTERSTATE HIGHWAY 64 (EXIT 278) AND STATE ROAD 194 (CHESAPEAKE BOULEVARD), LOCATED IN NORTHERN NORFOLK, GO NORTH ON CHESAPEAKE BOULEVARD FOR 1.3 KM (0.8 MI) TO THE INTERSECTION OF LITTLE CREEK ROAD. CONTINUE NORTH ON CHESAPEAKE BOULEVARD FOR 0.18 KM (0.11 MI) TO THE 0-METER POINT ON THE LEFT IN THE GRASS MEDIAN STRIP. THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST RECESSED 30 CM (12 IN) BELOW THE SURFACE OF THE GROUND SURROUNDED BY A MANHOLE AND COVERED BY A MANHOLE LID INSCRIBED, CITY WATER METER, THAT IS FLUSH WITH THE SURFACE OF THE GROUND. IT IS 175 M (574 FT) NORTH OF THE CENTERLINE OF LITTLE CREEK ROAD, 11.1 M (36.4 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 9.1 M (29.9 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, AND 0.4 M (1.3 FT) EAST OF A METAL WITNESS POST. THE 150-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "150 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 24.4 M (80.1 FT) NORTH-NORTHEAST OF WOODEN UTILITY POLE NO. EP73, 18.7 M (61.4 FT) SOUTH OF THE CENTERLINE OF A MEDIAN CROSSOVER, 11.5 M (37.7 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 8.7 M (28.5 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, 0.4 M (1.3 FT) EAST OF A METAL WITNESS POST, AND 0.4 M (1.3 FT) WEST OF A METAL WITNESS POST. THE 798-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "798 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 42.7 M (140.1 FT) SOUTH OF THE CENTERLINE OF SHEPPARD AVENUE, 12.6 M (41.3 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 7.7 M (25.3 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, 6.7 M (22.0 FT) EAST OF WOODEN UTILITY POLE NO. EE08, AND 0.3 M (1.0 FT) WEST OF A METAL WITNESS POST. 1THE 1440-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "1440 M" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 52.4 M (171.9 FT) SOUTH OF THE CENTERLINE OF FISHERMANS ROAD, 14.2 M (46.6 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 10.7 M (35.1 FT) NORTHEAST OF WOODEN UTILITY POLE NO. DJ41, 7.9 M (25.9 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, AND 0.4 M (1.3 FT) NORTH OF A METAL WITNESS POST. THE 100-FOOT TAPE CALIBRATION STATION IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "100 FT" SET IN THE TOP OF A 28 CM (11 IN) DIAMETER CONCRETE POST FLUSH WITH THE SURFACE OF THE GROUND. IT IS 205.5 M (674.2 FT) NORTH OF THE CENTERLINE OF LITTLE CREEK ROAD, 11.1 M (36.4 FT) EAST OF THE CENTERLINE OF THE SOUTHBOUND LANES OF CHESAPEAKE BOULEVARD, 9.0 M (29.5 FT) WEST OF THE CENTERLINE OF THE NORTHBOUND LANES OF CHESAPEAKE BOULEVARD, 5.5 M (18.0 FT) EAST OF WOODEN UTILITY POLE NO. 61, AND 0.3 M (1.0 FT) EAST OF A METAL WITNESS POST. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. TRAFFIC IS HEAVY ON CHESAPEAKE BOULEVARD, SAFETY PRECAUTIONS ARE RECOMMENDED. THE BASE LINE WAS ESTABLISHED AND REMEASURED WITH ASSISTANCE FROM THE CITY OF NORFOLK, DEPARTMENT OF PUBLIC WORKS, DIVISION OF SURVEYS. FOR MORE INFORMATION PLEASE CONTACT MR. JOHN SAUNDERS, CITY SURVEYOR, DIVISION OF SURVEYS, 7TH FLOOR CITY HALL BUILDING, NORFOLK, VIRGINIA 23501. TELEPHONE 804-441-2130. 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N370802 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: VIRGINIA TECH CBL VIRGINIA ROCKVILLE MD 20852 - OCTOBER 29, 1986 PROJECT ACCESSION NUMBER: G15767 MONTGOMERY COUNTY LIST OF ADJUSTED DISTANCES (APRIL 12, 1982) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 649.385 150 647.452 150.0009 150.0133 .3 0 649.385 430 643.902 429.9545 429.9894 .6 0 649.385 1000 639.379 999.9378 999.9879 .7 0 649.385 1400 641.796 1399.9679 1399.9885 .9 150 647.452 430 643.902 279.9536 279.9761 .5 150 647.452 1000 639.379 849.9370 849.9753 .6 150 647.452 1400 641.796 1249.9670 1249.9798 .8 430 643.902 1000 639.379 569.9833 570.0012 .6 430 643.902 1400 641.796 970.0131 970.0154 .5 1000 639.379 1400 641.796 400.0296 400.0369 .6 DESCRIPTION OF VIRGINIA TECH BASE LINE YEAR MEASURED: 1981 CHIEF OF PARTY: WJR * * * VIRGINIA TECH BASE LINE WAS REPORTED DESTROYED * * * A NEW CBL WAS SET BUT WAS NOT MEASURED BECAUSE IT FAILED TO MEET NGS SPECIFICATIONS. A NEW STATION 950 SET. THE BASE LINE IS LOCATED ABOUT 10.6 KM (6.6 MI) NORTH OF CHRISTIANSBURG AND ON THE SOUTH SIDE OF BLACKSBURG AT THE VIRGINIA TECH AIRPORT ALONG THE SOUTH WEST SIDE OF THE NORTHWEST-SOUTHEAST RUNWAY. TO REACH THE 0 METER POINT FROM THE VIRGINIA TECH AIRPORT CONTROL OFFICE, BEAR RIGHT AND FOLLOW TAXIWAY FOR 0.16 KM (0.1 MI) TO MAIN RUNWAY, TURN RIGHT AND FOLLOW RIGHT SIDE OF RUNWAY FOR 0.32 KM (0.2 MI) TO THE 430 METER POINT 150 FEET SOUTHWEST OF EDGE OF RUNWAY, CONTINUE ALONG RUNWAY FOR 0.24 KM (0.15 MI) TO THE 150 METER POINT 150 FEET SOUTHWEST OF EDGE OF RUNWAY, CONTINUE ALONG RUNWAY FOR 0.16 KM (0.1 MI) TO THE END OF RUNWAY AND THE 0 METER POINT 150 FEET SOUTHWEST OF EDGE OF RUNWAY. TO REACH THE 1000 AND 1400 METER POINTS START MILEAGE BACK WHERE TAXIWAY MEETS MAIN RUNWAY, GO NORTHWEST ON LEFT SIDE OF MAIN RUNWAY FOR 0.32 KM (0.2 MI) TO THE 1000 METER POINT 150 FEET SOUTHWEST OF EDGE OF RUNWAY, CONTINUE TO END OF RUNWAY, BEAR LEFT AND CONTINUE WESTERLY ACROSS RAILROAD GRADE FOR 1.3 KM (0.8 MI) TO THE 1400 METER POINT. THE 0 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 50.8 CM (20 IN) IN DIAMETER FLUSH WITH THE GROUND LOCATED 46.88 M (153.8 FT) SW FROM THE SOUTH MOST CORNER OF THE SOUTHEAST END OF RUNWAY, AND 45.72 M (150.0 FT) SW FROM THE SOUTHWEST EDGE OF RUNWAY. THE 1400 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 50.8 CM (20 IN) IN DIAMETER RECESSED 5 CM (2 IN) BELOW THE GROUND LOCATED 62.79 M (206.0 FT) SE FROM A 4 FT HIGH CONCRETE ASTRO PILLAR, 62.18 M (204.0 FT) SW FROM THE SOUTHWEST CORNER OF THE SOUTHEAST SET OF RUNWAY LANDING LIGHTS, AND 39.38 M (129.2 FT) NW FROM AN ABANDON RAILROAD GRADE. THE BASE LINE MARKS HAVE NOT BEEN STAMPED AT THIS TIME. THE 150, 430, 1000, AND 1400 METER POINTS HAVE CENTER PUNCH HOLES, NOT CROSSES. THE BASE LINE IS A NORTHWEST-SOUTHEAST LINE WITH THE 0 METER POINT ON THE SOUTHEAST END. IT IS MADE UP OF THE 0, 150, 430, 1000, AND 1400 METER POINTS. FOR SITE ACCESS CONTACT MR. BILL BYRNE, AIRPORT MANAGER, POST OFFICE BOX 903, BLACKSBURG, VA. 24060 TELEPHONE 703-961-6281. THIS BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE CIVIL ENGINEERING DEPARTMENT AT VIRGINIA TECH. FOR FURTHER INFORMATION CONTACT, CIVIL ENGINEERING DEPARTMENT, VIRGINIA POLYTECHNIC INSTITUTE AND STATE UNIVERSITY, BLACKSBURG, VIRGINIA 24061. TELEPHONE (703) 961-7147.