Laserfiche WebLink
months (April — June) of the growing season for signs of stress or leaf scorching. If leaf <br />scorching is observed, follow the decision matrix below. <br />Are cottonwood leaves <br />scorched? <br />Yes <br />Are cottonwood leaves <br />scorched on nearby <br />trees? <br />Yes <br />Are leaves turning <br />brown and curled? <br />Yes <br />Trees are not stressed due to <br />No lack of water. Re- inspect <br />during the next scheduled <br />monitoring period. <br />Stress may be related to causes <br />No other than lack of water. Be <br />aware of possible stressors <br />during future monitoring <br />No ----> <br />May still be an indication of <br />early stress and low water <br />availability. Check recent <br />rainfall data and groundwater <br />levels. Irrigation may be <br />needed. <br />Indication of drought stress. Check recent rainfall amounts and <br />groundwater levels to determine if drought is regional due to <br />precipitation or localized due to dewatering activities. Irrigation may be <br />necessary if symptoms are potentially due to dewatering actions. <br />b) Once per month during the winter dewatering period, inspect cottonwood trees within [750] <br />feet of the mine pit for signs of stress from desiccation (excessive drying), including broken <br />limbs, easily broken branches or stems, or sloughing of bark from the tree. If these <br />symptoms are visible on any single tree, check to determine if other trees are experiencing <br />similar problems that could be attributable to localized, excessive drought conditions. If <br />these stress indicators are observed, check past monitoring records for: <br />a. Determination if stresses were also occurring during the growing season <br />b. Groundwater levels to determine recovery and water availability during the past <br />season <br />c. Recent precipitation to determine if sufficient surface moisture has been available <br />