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4 <br /> <br />,.~ <br />aCCey uryey nc. - <br />3854lam6mn'Driow GawfmdAirpart, CmwfordCa(omCo 81415 <br />Dear Dave; <br />The field data that was surv~eved m Lire summer of iyy~ and aiso tiiai of me fau of <br />1991, reflect a horvnntal control error of up to 0.~ feet and a vertical eaor of up to 0.5 <br />feet. The summer work was dons by a Topcon Total Station and the fall work was done <br />by a HP3820A Total Station, both of which are cahbrated yearly. <br />There could be several factors in which the horizontal control is not as precise as <br />+/- 1 foot. <br />^ use of two different instruments <br />^(PPIVn atmospheric conditions <br />^ Different personal running the equipment <br />I believe that both surveys were run with precision and accuracy and with good <br />equipment, and that the errors reflect a random error in normal field conditions. <br />Sincerely <br />~-n <br />~o <br />Randy ~t'ihnor , <br />Valley Survey <br /> <br />(303J 921-30t7 ja;• 921-3075 • SKusage: 921-30t8 <br />