Third class survey refixation

Last week, I come across a lot with third class survey as shown as above. Usually we can see circle mark on second class survey either BKL or BL. However, there is a dot only in this case where previously the surveyor planted the hard wood only. According to the owner, this is a swamp area where he has been refilled with the additional soil to enable him to plant tree and flower around the compund. It is a good place for retire man such like the owner. Mr Healty. There is a uncommon name I heard before. Nice and handsome ex-teacher.

Ok. Come back to our topic " How to do refixation in 3rd class survey?" There are 5 points where the bearing are in the 3rd class value. The value is in degree only and I can say that the previous surveyor was using prism compass to carry out the survey.

Up grade the status of survey is part of our surveyor work. But we need to do in proper method to avoid any misunderstand among the adjoining neigbour lot.

Look at point 1 as above diagram. I noticed that there is a 0.47m misclose for a small loop. A big gap. Thus, we use the marks before and after point 1 as control because these 2 marks are in second class. After that we used intersect method to obtain the point of 1. This method is used because previous distance were in high accuracy (0.4 link).

How about point at 2,3,4 & 5? This is critical area needed to highlight. Let say there are no up-grade survey carried out and we need to refix by 3rd class value. Please acknowledged to the neighbour lot owner aware before you get trouble. Thank you.