@@@IMAGE=(NOAA3L,1,1),FORMS=(CALCOV),FONTS=(NADCOV),END; STATE OF IOWA @@@FORMS=NONE,FONTS=(L0112C),END; 1 1 CONTENTS BASE LINE DESIGNATION STATE COUNTY QUAD AMES IOWA STORY N410934 AMES CBL (1992 REMEASURED) IOWA STORY N410934 POTTAWATTAMIE IOWA POTTAWATTAMIE N410953 POTTAWATTAMIE CBL (1992 REMEASURED) IOWA POTTAWATTAMIE N410953 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410934 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: AMES IOWA ROCKVILLE MD 20852 - OCTOBER 29, 1986 PROJECT ACCESSION NUMBER: G17034 STORY COUNTY LIST OF ADJUSTED DISTANCES (DECEMBER 14, 1982) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 312.421 461 313.370 461.1134 461.1144 0.4 0 312.421 620 313.684 620.3457 620.3470 0.5 0 312.421 770 313.889 770.5033 770.5047 0.5 0 312.421 1370 314.894 1369.2477 1369.2500 0.7 461 313.370 620 313.684 159.2323 159.2326 0.4 461 313.370 770 313.889 309.3900 309.3904 0.4 461 313.370 1370 314.894 908.1344 908.1357 0.6 620 313.684 770 313.889 150.1576 150.1578 0.2 620 313.684 1370 314.894 748.9021 748.9030 0.4 770 313.889 1370 314.894 598.7444 598.7453 0.4 DESCRIPTION OF AMES BASE LINE YEAR MEASURED: 1982 CHIEF OF PARTY: REP THE BASE LINE IS LOCATED ABOUT 6.4 KM (4 MI) SOUTHWEST OF AMES, PARALLEL TO AND ALONG THE SOUTH SIDE OF A GRAVEL ROAD WHICH INTERSECTS WITH STORY COUNTY ROAD R 38 TO THE EAST OF BASE LINE. TO REACH THE BASE LINE FROM THE JUNCTION OF U.S. HIGHWAY 69 AND LINCOLN WAY (OLD U.S. HIGHWAY 30) IN AMES, GO WEST ON LINCOLN WAY FOR 4.8 KM (3.0 MI), TO STORY COUNTY R 38 (SOUTH DAKOTA AVE). TURN LEFT ON STORY COUNTY R 38 (PAVED SURFACE) AND GO SOUTH FOR 3.2 KM (2.0 MI) TO GRAVEL CROSSROAD. TURN RIGHT AND GO WEST FOR 0.2 KM (0.15 MI) TO THE 0 METER POINT ON LEFT (ABOUT THE SAME ELEVATION AS THE ROAD). THE 0 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF AN IRREGULAR MASS OF CONCRETE 33 CM (13 IN) IN DIAMETER PROJECTING 8 CM (3 IN) ABOVE THE GROUND LOCATED 6.4 M (21 FT) S FROM THE CENTER OF A GRAVEL ROAD, 3.6 M (12 FT) N FROM A WIRE FENCE, AND 2.4 M (8 FT) WNW FROM A ROAD SIGN. THE 461 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 55 CM (22 IN) IN DIAMETER FLUSH WITH GROUND LOCATED 5.8 M (19 FT) S FROM THE CENTER OF A GRAVEL ROAD, 4.3 M (14 FT) N FROM A WIRE FENCE, 5.2 M (17 FT) NW FROM A POWER LINE POLE, AND 0.6 M (2 FT) LOWER THAN THE GRAVEL ROAD. THE 620 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 44 CM (17 IN) IN DIAMETER PROJECTING 5 CM (2 IN) ABOVE THE GROUND LOCATED 6.1 M (20 FT) S FROM THE CENTER OF A GRAVEL ROAD, 4.0 M (13 FT) N FROM A WIRE FENCE, 32.3 M (106 FT) W FROM A POWER LINE POLE, AND 0.6 M (2 FT) LOWER THAN GRAVEL ROAD. THE 770 METER POINT IS A STANDARD NGS DISK SET IN THE TOP OF A ROUND CONCRETE MONUMENT 33 CM (13 IN) IN DIAMETER FLUSH WITH GROUND LOCATED 6.4 M (21 FT) S FROM THE CENTER OF A GRAVEL ROAD, 4.3 M (14 FT) N FROM A WIRE FENCE, 8.2 M (27 FT) E FROM THE CENTER OF A TRACK ROAD LEADING SOUTH TO A RADIO TOWER AND BUILDING, AND 0.9 M (3.0 FT) LOWER THAN GRAVEL ROAD. THE 1370 METER POINT IS A STANDARD NGS DISK SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 30 CM (12 IN) IN DIAMETER PROJECTING 10 CM (4 IN) ABOVE THE GROUND LOCATED 5.8 M (19 FT) S FROM CENTER OF A GRAVEL ROAD, 4.0 M (13 FT) N FROM A WIRE FENCE, 69.8 M (229 FT) E FROM CENTER OF GRAVEL ROAD (NORTH-SOUTH) INTERSECTING WITH EAST-WEST GRAVEL ROAD, AND 0.3 M (1.0 FT) LOWER THAN THE GRAVEL ROAD. NONE OF THE DISKS ARE STAMPED. THE BASE LINE IS A EAST-WEST BASE LINE WITH THE 0 METER POINT ON THE EAST END. IT IS MADE UP OF 0, 461, 620, 770, AND 1370 METER POINTS. ALL OF THE MARKS ARE SET ON A LINE SOUTH OF AND PARALLEL TO THE EAST-WEST GRAVEL ROAD. THE BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE IOWA STATE UNIVERSITY AT AMES, IOWA. FOR FURTHER INFORMATION, CONTACT DEPARTMENT OF CIVIL ENGINEERING, IOWA STATE UNIVERSITY, AMES, IOWA 50011. TELEPHONE (515) 294-3532 OR 6324. 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410934 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: AMES CBL IOWA ROCKVILLE MD 20852 - AUGUST 28, 1992 PROJECT ACCESSION NUMBER: 17034 STORY COUNTY NEAREST TOWN: AMES LIST OF ADJUSTED DISTANCES (AUGUST 18, 1992) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 M 312.399 461 M 313.336 461.1988 461.1997 0.1 0 M 312.399 620 M 313.659 620.4288 620.4301 0.1 0 M 312.399 770 M 313.860 770.5867 770.5881 0.1 0 M 312.399 1370 M 314.894 1369.3327 1369.3350 0.2 461 M 313.336 620 M 313.659 159.2300 159.2304 0.1 461 M 313.336 770 M 313.860 309.3879 309.3884 0.1 461 M 313.336 1370 M 314.894 908.1340 908.1353 0.1 620 M 313.659 770 M 313.860 150.1579 150.1580 0.1 620 M 313.659 1370 M 314.894 748.9039 748.9050 0.1 770 M 313.860 1370 M 314.894 598.7461 598.7470 0.1 DESCRIPTION OF AMES BASE LINE YEAR MEASURED: 1982 YEAR REMEASURED: 1992 CHIEF OF PARTY: KM THE BASE LINE IS LOCATED ABOUT 12.2 KM (7.6 MI) NORTH OF SLATER AND 6.4 KM (4.0 MI) SOUTHWEST OF AMES. THE BASE LINE RUNS ALONG AND IS APPROXIMATELY PARALLEL WITH THE SOUTH EDGE OF A GRAVEL ROAD. THE BASE LINE IS AN EAST-WEST LINE WITH THE 0-METER POINT ON THE EAST END. IT CONSISTS OF THE 0, 461, 620, 770, AND 1370 METER POINTS. TO REACH THE 0-METER POINT FROM THE JUNCTION OF U.S. HIGHWAYS 30 AND 69, LOCATED ON THE SOUTHEAST SIDE OF AMES, GO NORTH ON U.S. HIGHWAY 69 (DUFF AVENUE) FOR 2.0 KM (1.2 MI) TO THE INTERSECTION OF LINCOLN WAY (THE MAIN EAST-WEST STREET). TURN LEFT AND GO WEST ON LINCOLN WAY FOR 5.6 KM (3.5 MI) TO THE INTERSECTION OF COUNTY ROAD R 38 (SOUTH DAKOTA AVENUE) ON THE LEFT. TURN LEFT AND GO SOUTH ON COUNTY ROAD R 38 FOR 1.6 KM (1.0 MI) TO THE NORTH END OF THE BRIDGE OVER U.S. HIGHWAY 30. CONTINUE SOUTH ON COUNTY ROAD R 38 FOR 1.6 KM (1.0 MI) TO A GRAVEL CROSSROAD. TURN RIGHT AND GO WEST ON THE GRAVEL ROAD FOR 0.22 KM (0.14 MI) TO THE 0-METER POINT ON THE LEFT. THE 0-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "0 M" SET IN THE TOP OF A 33 CM (13 IN) DIAMETER CONCRETE POST PROJECTING 5 CM (2 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 6.0 M (19.7 FT) SOUTH OF, AND ABOUT LEVEL WITH, THE CENTERLINE OF THE GRAVEL ROAD AND 3.4 M (11.2 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 461-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "461 M" SET IN THE TOP OF A 51 CM (20 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 6.0 M (19.7 FT) SOUTH OF, AND ABOUT 0.8 M (2.5 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 5.0 M (16.4 FT) NORTHWEST OF A WOODEN POWER POLE, AND 4.1 M (13.5 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 620-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "620 M" SET IN THE TOP OF A 41 CM (16 IN) DIAMETER CONCRETE POST RECESSED 5 CM (2 IN) BELOW THE SURFACE OF THE GROUND. IT IS 5.9 M (19.4 FT) SOUTH OF, AND ABOUT 0.6 M (2.0 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD AND 3.9 M (12.8 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. 1THE 770-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "770 M" SET IN THE TOP OF A 41 CM (16 IN) DIAMETER CONCRETE POST RECESSED 8 CM (3 IN) BELOW THE SURFACE OF THE GROUND. IT IS 8.5 M (27.9 FT) EAST OF THE CENTERLINE OF A GRAVEL DRIVE LEADING TO A RADIO TOWER, 6.2 M (20.3 FT) SOUTH OF, AND ABOUT 0.8 M (2.5 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, AND 4.0 M (13.1 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. THE 1370-METER POINT IS A STANDARD NGS CALIBRATION BASE LINE DISK STAMPED "1370 M" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 8 CM (3 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 6.2 M (20.3 FT) SOUTH OF, AND ABOUT LEVEL WITH, THE CENTERLINE OF THE GRAVEL ROAD AND 4.0 M (13.1 FT) NORTH OF A METAL WITNESS POST IN A FENCE LINE. USER NOTES: CBL USERS SHOULD TAKE CARE IN PLUMBING OVER ALL POINTS. ELEVATIONS ARE FOR CBL USE ONLY. THE 0-METER POINT HAS BEEN DISTURBED. THE NORTH EDGE OF THE CONCRETE POST IS SHEARED OFF AND THE MONUMENT IS LEANING TO THE SOUTHEAST. THIS CALIBRATION BASE LINE WAS ESTABLISHED AND REMEASURED WITH ASSISTANCE FROM THE IOWA STATE UNIVERSITY. FOR MORE INFORMATION PLEASE CONTACT DR. K. JEYAPALAN, DEPARTMENT OF CIVIL ENGINEERING, SURVEY SECTION, IOWA STATE UNIVERSITY, AMES, IA 50011. TELEPHONE (515) 294-6324 OR 294-3532. OR CONTACT MR. DENNIS OBRIEN, OFFICE OF ROAD DESIGN, SURVEY SUPERVISOR, IOWA DEPARTMENT OF TRANSPORTATION, 800 LINCOLN WAY, AMES, IA 50010. TELEPHONE (515) 239-1209. 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410953 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: POTTAWATTAMIE IOWA ROCKVILLE MD 20852 - OCTOBER 29, 1986 PROJECT ACCESSION NUMBER: G17034 POTTAWATTAMIE COUNTY LIST OF ADJUSTED DISTANCES (MARCH 20, 1984) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 1983 299.009 150 1983 299.378 149.9921 149.9925 0.2 0 1983 299.009 430 1983 299.080 429.9977 429.9977 0.5 0 1983 299.009 1400 1983 299.009 1400.0095 1400.0095 0.7 150 1983 299.378 430 1983 299.080 280.0056 280.0058 0.4 150 1983 299.378 1400 1983 299.009 1250.0175 1250.0176 0.6 430 1983 299.080 1400 1983 299.009 970.0119 970.0119 0.4 DESCRIPTION OF POTTAWATTAMIE BASE LINE YEAR MEASURED: 1983 CHIEF OF PARTY: WJR COUNCIL BLUFFS, 9.7 KM (6.0 MI) NORTH-NORTHEAST OF OMAHA, NEBRASKA, 4.8 KM (3.0 MI) WEST OF CRESCENT, IOWA, 1.6 KM (1.0 MI) WEST-NORTHWEST OF THE JUNCTION OF INTERSTATE HIGHWAY 680 AND INTERSTATE HIGHWAY 29 AND NORTH OF THE WESTBOUND LANES OF INTERSTATE HIGHWAY 680 AND SOUTH OF A GRAVEL FRONTAGE ROAD ABOUT 1.2 KM (0.75 MI) EAST OF EXIT ONE. TO REACH THE BASE LINE FROM THE JUNCTION OF INTERSTATE HIGHWAY 680 AND INTERSTATE HIGHWAY 29, WHICH IS ABOUT 12.9 KM (8.0 MI) NORTH-NORTHWEST OF COUNCIL BLUFFS, GO WEST ALONG INTERSTATE HIGHWAY 680 FOR 2.6 KM (1.6 MI) TO COUNTY ROAD EXIT NUMBER 11. BEAR RIGHT AND GO WESTERLY ALONG EXIT RAMP NUMBER 1 FOR 0.6 KM (0.4 MI) TO A T-ROAD JUNCTION. TURN RIGHT AND GO NORTH ALONG A GRAVEL ROAD FOR 0.1 KM (0.05 MI) TO THE POINT WHERE THE GRAVEL ROAD TURNS SHARPLY TO THE RIGHT. TURN RIGHT AND GO EAST ALONG THE GRAVEL FRONTAGE ROAD FOR 1.21 KM (0.75 MI) TO THE 0 METER POINT ON THE RIGHT. THE BASE LINE IS SET ABOUT 1.5 M (5.0 FT) BELOW THE LEVEL OF THE GRAVEL FRONTAGE ROAD. THE BASE LINE IS AN EAST-NORTHEAST-WEST-SOUTHWEST LINE WITH THE 0 METER POINT ON THE WEST-SOUTHWEST END. IT CONSISTS OF THE 0, 150, 430, AND 1400 METER POINTS. THERE ARE TWO MONUMENTS SET EAST-NORTHEAST OF THE 0 METER POINT TO BE USED FOR CALIBRATION OF 100 FOOT TAPES. THE BASE LINE IS APPROXIMATELY PARALLEL TO AND ABOUT 1.5 M (5.0 FT) BELOW THE LEVEL OF A GRAVEL FRONTAGE ROAD. ALL THE MARKS ARE APPROXIMATELY 6.1 M (20.0 FT) SOUTH-SOUTHEAST FROM THE SOUTH EDGE OF A GRAVEL FRONTAGE ROAD, ABOUT 1.8 M (6.0 FT) NORTH-NORTHWEST OF A WIRE FENCE, AND ABOUT 3.0 M (10.0 FT) BELOW THE LEVEL OF INTERSTATE HIGHWAY 680. THE 0 METER POINT IS A STANDARD DISK STAMPED---0 1983---SET INTO THE TOP OF A ROUND CONCRETE MONUMENT 30 CM (12 IN) IN DIAMETER PROJECTING 13 CM (5 IN) ABOVE THE GROUND LOCATED 10.2 M (33.5 FT) SSE FROM THE CENTER OF A GRAVEL FRONTAGE ROAD (SLOPE DISTANCE) AND 1.9 M (6.1 FT) NNW FROM THE I-680 BOUNDARY FENCE. ALL THE MARKS EXCEPT THE 100 FOOT POINTS ARE PLAIN 3.8 CM (1.5 IN) BRASS DISKS STAMPED WITH THEIR BASE LINE DESIGNATION AND THE YEAR 1983, SET IN THE TOP OF 30 CM (12.0 IN) ROUND CONCRETE MONUMENTS THAT PROJECT ABOUT 13 CM (5.0 IN). THE 100 FOOT POINTS ARE PLAIN 3.8 CM (1.5 IN) BRASS DISKS STAMPED---100 FOOT 1983 A---AND---100 FOOT 1983 B---SET IN THE TOP OF 20 CM (8.0 IN) ROUND CONCRETE MONUMENTS THAT PROJECT ABOUT 0.55 M (1.8 FT) ABOVE THE GROUND. THIS BASE LINE WAS ESTABLISHED IN CONJUNCTION WITH THE IOWA WESTERN COMMUNITY COLLEGE. FOR FURTHER INFORMATION CONTACT POTTAWATTAMIE COUNTY ENGINEER, POST OFFICE BOX 1168, COUNCIL BLUFFS, IOWA 50502. TELEPHONE (712) 328-5608. 1 US DEPARTMENT OF COMMERCE - NOAA CALIBRATION BASE LINE DATA QUAD: N410953 NOS - NATIONAL GEODETIC SURVEY BASE LINE DESIGNATION: POTTAWATTAMIE CBL IOWA ROCKVILLE MD 20852 - AUGUST 28, 1992 PROJECT ACCESSION NUMBER: 17034 POTTAWATTAMIE COUNTY NEAREST TOWN: CRESCENT LIST OF ADJUSTED DISTANCES (AUGUST 17, 1992) ADJ. DIST.(M) ADJ. DIST.(M) STD. FROM STATION ELEV.(M) TO STATION ELEV.(M) HORIZONTAL MARK - MARK ERROR(MM) 0 1983 299.009 150 1983 299.387 149.9879 149.9884 0.1 0 1983 299.009 430 1983 299.089 430.0034 430.0034 0.2 0 1983 299.009 1400 1983 299.021 1400.0075 1400.0075 0.2 150 1983 299.387 430 1983 299.089 280.0155 280.0156 0.1 150 1983 299.387 1400 1983 299.021 1250.0196 1250.0196 0.2 430 1983 299.089 1400 1983 299.021 970.0041 970.0041 0.1 A TAPE CALIBRATION MONUMENT WAS SET AT THE 100 FOOT POINT OF THE BASE LINE. THE REDUCED MARK TO MARK DISTANCE IS 99.99 FT. DESCRIPTION OF POTTAWATTAMIE BASE LINE YEAR MEASURED: 1983 YEAR REMEASURED: 1992 CHIEF OF PARTY: KM THE BASE LINE IS LOCATED ABOUT 10.0 KM (6.2 MI) NORTH-NORTHWEST OF COUNCIL BLUFFS, IOWA, 9.7 KM (6.0 MI) NORTH-NORTHEAST OF OMAHA, NEBRASKA, AND ABOUT 4.8 KM (3.0 MI) WEST OF CRESCENT. THE BASE LINE IS AN EAST-NORTHEAST, WEST-SOUTHWEST LINE WITH THE 0-METER POINT ON THE WEST-SOUTHWEST END. IT CONSISTS OF THE 0, 150, 430, AND 1400 METER POINTS WITH A PAIR OF STATIONS USED FOR 100-FOOT TAPE CALIBRATION LOCATED EAST OF THE 0-METER POINT AND SLIGHTLY OFF LINE. TO REACH THE 0-METER POINT FROM THE JUNCTION OF INTERSTATE HIGHWAYS 680 AND 29, LOCATED ABOUT 10.0 KM (6.2 MI) NORTH OF COUNCIL BLUFFS, GO WEST-SOUTHWEST ON INTERSTATE HIGHWAY 680 FOR 2.5 KM (1.6 MI) TO THE EXIT RAMP FOR A COUNTY ROAD (EXIT 1). TAKE THE EXIT RAMP AND GO WEST-NORTHWEST FOR 0.6 KM (0.4 MI) TO A STOP SIGN AND T-JUNCTION. TURN RIGHT AND GO NORTHERLY ON A GRAVEL ROAD FOR 0.10 KM (0.06 MI) TO A GRAVEL T-JUNCTION. TURN RIGHT AND GO EASTERLY ON THE GRAVEL ROAD FOR 1.2 KM (0.7 MI) TO THE 0-METER POINT ON THE RIGHT. THE 0-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "0 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 15 CM (6 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.0 M (32.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 2.0 M (6.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.7 M (5.6 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. THE 150-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "150 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 13 CM (5 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.2 M (33.5 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 2.0 M (6.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.7 M (5.6 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. THE 430-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "430 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 20 CM (8 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.6 M (34.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 1.8 M (5.9 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE, AND 1.6 M (5.2 FT) NORTH- NORTHWEST OF A METAL WITNESS POST. 1THE 1400-METER POINT IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "1400 1983" SET IN THE TOP OF A 30 CM (12 IN) DIAMETER CONCRETE POST PROJECTING 10 CM (4 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 20.7 M (67.9 FT) NORTH-NORTHWEST OF THE NORTH EDGE OF THE WESTBOUND LANES OF INTERSTATE HIGHWAY 680, 10.9 M (35.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, AND 1.3 M (4.3 FT) NORTH-NORTHWEST OF A METAL WITNESS POST. THE 0-FOOT TAPE CALIBRATION STATION IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "100 FEET 1983 A" SET IN THE TOP OF A 25 CM (10 IN) DIAMETER CONCRETE POST PROJECTING 52 CM (20 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.6 M (34.8 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD, 4.4 M (14.4 FT) EAST OF THE 0-METER POINT, AND 1.1 M (3.6 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE. THE 100-FOOT TAPE CALIBRATION STATION IS A 5 CM (2 IN) BLANK BRASS DISK STAMPED "100 FEET 1983 B" SET IN THE TOP OF A 25 CM (10 IN) DIAMETER CONCRETE POST PROJECTING 45 CM (18 IN) ABOVE THE SURFACE OF THE GROUND. IT IS 10.5 M (34.4 FT) SOUTH-SOUTHEAST OF, AND ABOUT 1.5 M (4.9 FT) LOWER THAN, THE CENTERLINE OF THE GRAVEL ROAD AND 1.3 M (4.3 FT) NORTH-NORTHWEST OF A METAL RIGHT-OF-WAY FENCE. THE 100-FOOT TAPE CALIBRATION STATION WAS REMEASURED BY EDMI METHOD AND FOUND TO BE 30.477 M (99.99 FT) FROM THE 0-FOOT CALIBRATION STATION (MARK-TO-MARK DISTANCE). 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 IOWA WESTERN COMMUNITY COLLEGE AND REMEASURED WITH ASSISTANCE FROM THE POTTAWATTAMIE COUNTY ENGINEERING DEPARTMENT. FOR FURTHER INFORMATION PLEASE CONTACT MR. JOHN MUNSON III, POTTAWATTAMIE COUNTY ENGINEERING OFFICE, 223 SOUTH SIXTH STREET, COUNCIL BLUFFS, IA 51501. TELEPHONE (712) 328-5608.