For every subdivision of land there shall be a survey meeting the following requirements: (1) MONUMENTS. (ac) All of the monuments required in pars. (ag) to (h) shall be placed flush with the ground if practicable. Whenever placement of a monument under this subsection is required at a corner or point that falls within a street or proposed future street, the monument shall be placed in the side line of the street if practicable. (ag) The external boundaries of a subdivision shall be monumented in the field by monuments of concrete containing a ferrous rod one-fourth inch in diameter or greater imbedded its full length, not less than 18 inches in length, not less than 4 inches square or 5 inches in diameter, and marked on the top with a cross, brass plug, iron rod, or other durable material securely embedded; or by iron rods or pipes at least 18 inches long and 2 inches in diameter weighing not less than 3.65 pounds per lineal foot. Solid round or square iron bars of equal or greater length or weight per foot may be used in lieu of pipes wherever pipes are specified in this section. These monuments shall be placed at all corners, at each end of all curves, at the point where a curve changes its radius, at all angle points in any line and at all angle points along the meander line, said points to be not less than 20 feet back from the determined or approximated ordinary high water mark. (b) All internal boundaries and those corners and points not required to be marked by par. (ag) shall be monumented in the field by like monuments as defined in par. (ag). These monuments shall be placed at all block corners, at each end of all curves, at the point where a curve changes its radius, and at all angle points in any line. (c) All lot, outlot, park and public access corners and the corners of land dedicated to the public shall be monumented in the field by iron pipes at least 18 inches long and one inch in diameter, weighing not less than 1.13 pounds per lineal foot, or by round or square iron bars at least 18 inches long and weighing not less than 1.13 pounds per lineal foot. (d) The lines of lots, outlots, parks and public access and land dedicated to the public that extend to lakes or to navigable streams shall be monumented in the field by iron pipes at least 18 inches long and one inch in diameter weighing not less than 1.13 pounds per lineal foot, or by round or square iron bars at least 18 inches long and weighing not less than 1.13 pounds per lineal foot. These monuments shall be placed at the point of intersection of the lake or navigable stream lot line with a meander line established not less than 20 feet back from the determined or approximated ordinary high water mark. (f) Any durable metal or concrete monuments may be used in lieu of iron pipes provided that they are uniform within the platted area and have a permanent magnet embedded near the top or bottom or both. (g) In cases where strict compliance with this subsection would be unduly difficult or would not provide adequate monuments, the department may make other reasonable requirements. (h) The governing body of the city, village or town which is required to approve the subdivision under s. 236.10 may waive the placing of monuments under pars. (b), (c) and (d) for a reasonable time on condition that the subdivider executes a surety bond to ensure that he or she will place the monuments within the time required. (2) ACCURACY OF SURVEY. The survey shall be performed by a professional land surveyor and if the error in the latitude and departure closure of the survey or any part thereof is greater than the ratio of one in 3,000, the plat may be rejected.
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