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Widening or reconstruction of the Bristol Street bridge is not expected to have <br />impacts on the minor biological features of Santiago Creek The wetland -- <br />features of Santiago Creek and the wetland features that formerly existed <br />on this creek have been previously destroyed when the meek was stavilized <br />and channelized. Activities during the construction phase of the bridge - <br />widening are not expected to impact adjacent or downstream wildlife values. <br />The greatest impact will be to the ornamental plants that exist on the road •- <br />shoulders adjacent to the bridge. At least three large blue gum trees on the r- <br />southwest shoulder, a large Italian stone pine on the northwest shoulder, and <br />one medium -sized sycamore tree on the southeast shoulder of the bridge will <br />have to be removed to accommodate the bridge and street widening. Their <br />removal is not expected to produce negative biological impacts. <br />ra <br />Mitigation Measures <br />1. Replacement of tree plantings will occur on those shoulders without �- <br />surviving trees. <br />2. Bridge widening design and construction will comply with applicable <br />requirements of the "nationwide permit" provisions pursuant to the <br />Federal Clean Water Act and with applicable requirements of a <br />Streambed Alteration Permit issued by the California Department of <br />Fish and Game. <br />F. WATER QUALITY M <br />Consequences <br />M <br />Construction of the preferred widening alternative would not directly affect the <br />quality of local groundwater or other water sources. Street construction <br />activities typically involve very shallow excavation, reaching maximum depths <br />of about one or two feet. Throughout the subject segment of Bristol Street <br />(except Santiago Creek), depths to groundwater are greater than five feet. <br />Within Santiago Creek, depth to groundwater is somewhat shallower, <br />especially during the rainy season, but the absence of any typical wetland <br />vegetation or wildlife indicate that depth to groundwater in the creek bed is <br />not shallow. Reconstruction of the Santiago Creek Bridge supports, if needed, <br />would be accomplished during dry months, thus minimizing any disturbance to <br />ground water. <br />If not controlled, sediments and urban run -offs occurring during street <br />widening activities could result in contaminants being added to downstream ' <br />waters, where the street drainage system ultimately flows. <br />N -6 <br />