09 ATTACHMENT 3 - Laserfiche WebLink

March 23, 2006 Page 4 F. GEOLOGY, SOILS, AND SEISMICITY The Pleasanton General Plan recognizes that there is a seismic risk associated with development in the Pleasanton Planning Area and calls for a geotechnical investigation when any building intended for human occupancy is proposed for construction of within an earthquake zone. The geotechnical study is subject to review by the City's consulting geologist for acceptability. This measure is found by Pleasanton to reduce the seismic risk of individual projects to an acceptable level. The cumulative risk associated with a seismic event would increase with the movement of population into a seismically active area. This impact is not mitigatable. It will be addressed narratively without a scope adjustment. G. HAZARDS AND HAZARDOUS MATERIALS The three projects are residential projects. If hazards and/or hazardous materials are identified associated with the projects, those hazards are likely to be capable of mitigation at the project level. Should subsequent project analysis determine that there would be a contribution to an areawide cumulative impact, this topic would be reconsidered and a scope adjustment requested. H. HYDROLOGY AND WATER QUALITY The analysis of the cumulative impacts of the Oak Grove and Greenbriar/Spotorno residential devel- opments on hydrology and water quality will be conducted by BASELnvE Environmental Consulting. The following potential impacts would be addressed in the cumulative analysis: (1) Impacts on surface water quality runoff and degradation of receiving water quality, (2) Impacts associated with hydromodification of downstream creek channels associated with the combined runoff from the three projects, and (3) Impacts associated with incremental salt loading that would result from the three projects in the Livermore-Amador Valley groundwater basin. The onsite mitigation each project proposes will be taking into account in this cumulative analysis. n. The Lund 2 property will be included in the multi-project cumulative analysis if the Lund 2 EIR team and/or the applicant provides sufficient information on Lund 2 drainage and hydrology to permit BASELnvE to add it to their scope. I. LAND USE AND PLANNING In view of the fact that these projects are envisioned by the General Plan, the General Plan cumulative analysis covers them. A supplemental cumulative analysis limited to the three projects is not proposed. J. NOISE The analysis of cumulative noise impacts will be conducted by Illingworth & Rodkin. It is anticipated that traffic from Lund 2 and Greenbriar/Spotorno would contribute cumulatively to traffic noise at I&R's noise monitoring station on Sycamore Creek Way. The cumulative impact will be assessed ar. ~ u~~ .~; ~~~ , .~bc :a_rm rt.~ ~ ,,,n:a ~ ... , :'n