Attachment N-7 <br />page 3 of 5 <br />4. Multi Stemmed maple(s), <br />river side of project: <br />Mature 32" <br />cottonwood <br />tree <br />10" multi stemmed <br />maple(s) <br />Maintain 16 ft <br />between maple <br />trunks and <br />construction fence <br />(river side of <br />maples) <br />vault <br />pipeline valve <br />Maintain <br />12 ft <br />between <br />maple trunks <br />and <br />construction <br />fence <br />(project side of maples) <br />A. The tree protection zone as suggested above, for the multi stemmed maples should <br />be preserved, with no roots cut, and with grade un-changed. If the grade of the <br />proposed adjacent parking lot is more than 1' higher than the grade of the multi- <br />stemmed maples, a simple retaining wall of keystone blocks should be installed. <br />B. If the multi stemmed maples are to be included in the permanent irrigation scheme, <br />do not trench within the suggested tree protection zone. If the tree(s) are to be <br />irrigated, to not apply water within 4 ft. of the trunks. <br />C. Hand digging within this protection zone should be directed by, or done by, a certified <br />arborist. <br /> <br />Drawing not to scale <br />Please turn to page 4 <br />