5. 4. THREE HILLS A,B,& C HAS ELEVATIONS OF 660m, 625m & 600m RESPECTIVELY. B IS IN BETWEEN A & C AND IS 10km FROM A & 12km FROM C. a. b. C. CONSIDERING THE EFFECT OF CURVATURE & REFRACTION CORRECTION, WHAT IS THE CLEARANCE OR OBSTRUCTION OF THE LINE OF SIGHT AT B CONSIDERING THAT C IS VISIBLE FROM A. IF A 5m TOWER IS ERECTED ON TOP OF B, WHAT WOULD BE THE HEIGHT OF EQUAL TOWERS TO BE ERECTED AT A & C IN ORDER THAT A,B, & C WILL BE INTERVISIBLE WHAT SHOULD BE THE HEIGHT OF TOWER TO BE ERECTED AT C SO THAT B & C WILL BE INTERVISIBLE FROM A. DRAW A SKETCH COMPLETE WITH THE NORHT ARROW ON A CARDINAL DIRECTION & LOCATE THE BENCHMARK GIVEN THE FOLLOWING TECHNICAL DESCRIPTION: SET SPIKE 2m W/O BCR SOUTH CURB VICTORY BLVD. W/O VAN NUYS BLVD. 6. WRITE THE NUMBER BEING CALLED OUT BY THE SURVEYOR