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w KIER WRIGHT Civil Engineers Surveyors, Inc. Attachment I:Surveying Methodology- Brief summary of the overall history of the block dimensioning in this area A) Oakland Land Company Map, 1894 a. The lots. blocks and roadways in the immediate area were originally shown on the "Amended • Map of the Oakland Land and Improvement Co's Subdivision of a portion of the Santa Rita Ranch at Pleasanton Alameda Co. Cal 1894" filed for record on June 20. 1894 and posted in Book 14 of Maps at Page 20. Alameda County records. On this map there were 24 lots. labeled A thru X in the area hounded by the East line of Oakland Avenue. the North line of Pleasanton Avenue (now known as Mohr Avenue), the west line of Martin Avenue and the South line of Santa Rita Avenue (now known as Trenery Drive). h. The dimensions of these lots were all 544.5 feet deep in the North/Si.,uth direction and 400 feet wide in the east/west direction. They were arranged into 4 tiers of 6 lots each with the two center tiers being divided by a street designated as Camron Avenue on the map. c. For the purposes of discussion all dimensions labeled hereinafter as "record' will relate to the mathematical information shown on this 1894 map for the lots and roadways. All of these quoted "record dimensions" can he observed on this map by the use of simple addition and subtraction. B) Parcel Map 1558. 1974 In 1974 the firm of McKay and Sumps prepares Parcel Map 1558 (84m62) which is a subdivision adjacent to the area in question. In order to resolve the exterior boundary of their subdivision they retraced and resolved the area hounded by Mohr Avenue. Martin Avenue.Trenery Drive and Oakland Avenue. They recovered existing survey markers and then show the mathematical information around this two block area. A comparison of their findings is: a. Along Mohr from Martin to Oakland: measured 2459.15' vs. "record''of 2460' h. Atong Trenery from Martin to Oakland: measured 2459.42' vs. "record'of 2460' c. Along Martin from Mohr to Trenery: measured 2249.27' vs. "record of 2248' (note: the dimension line in Mohr is 40' south of the southerly property line of lots a dru E) d. Along Oakland Avenue from Mohr to Trenery: measured 2248.74' vs. "record"of 2248' The largest discrepancy they found was 127 feet in a north and south direction in the retracenent of an 80 year old subdivision. C) Parcel Map 2547, 1978 In 1978 the firm of Archer and Barbee prepared Parcel Map 2547 (105m14) which is a subdivision generally hounded on the North by Trenery Drive. on the South by Cameron Avenue, on the East by Martin Avenue and on the west by the dividing line between original lots V/U and 0/P. This map covers the majority of original lots P.Q.R.S.T and U. They recovered existing survey markers and then show the mathematical information around this area. A comparison of their findings is: • a. Along Cameron from Martin westerly to the dividing line between lots O and P: measured • 1199.73' vs. -record- 1200' h. Along Trenery from Martin westerly to the dividing line between lots O and P: measured 1199.94 vs. 1200' record. c. Along Martin hoe Cameron to'Trenery: measured 1119.70 vs. record 1 119'. d. Along the westerly line of lots U and P: measured 1 119.4' vs. record I f 19'. 2850 Collier Canyon Road, Livermore, California 94551 (925) 245-8788 • FAX (925) 245-8796