08 ATTACHMENTS 1- 6 - Laserfiche WebLink

Mitigation Measure 4.4-1a: In general, landslide debris shall be removed where present and replaced with engineered fill in accordance with the approved corrective grading plan. More detailed information regarding the location, extent, and depth of the required landslide mitigation shall be depicted on the final project corrective grading plan to be submitted with the final grading plan, subject to review and approval by the City of Pleasanton Building and Safety Services Division. Mitigation Measure 4.4-1b: Landslide repairs shall be conducted on the natural slope behind Lots 24 and 25 (Landslide 17)and the proposed cut and fill slope adjacent to the driveway south of Lots 24 and 25 shall also be regarded. The finished slopes should be graded to approximately re-create the existing slope contours and to conform as much as possible with the adjacent natural slopes. Significant Impact Impact 4.4-2: Construction of the project on steep slopes could result in soil erosion or the loss of topsoil. Finding Changes or alterations have been required in, or incorporated into,the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential impacts related to soil erosion to a less-than-significant level: Mitigation Measure 4.4-2a: In the event of a work stoppage due to rain during construction, the contractor shall construct positive slopes to carry water surface runoff away from steep slopes to storm drainage structures or other areas where erosion can be controlled. In no event shall a completed slope be left standing through the winter season without erosion control features being provided. Mitigation Measure 4.4-2b: The on-site geotechnical engineer shall determine the depth of topsoil in the field during grading. Identified top soil shall be reserved and placed on graded slopes Excess top soil that is not suitable for use as engineered fill may be used in approved open space of landscape areas, if approved by the landscape architect. Mitigation Measure 4.4-2c: All landscaped slopes shall be maintained in a vegetated state after project completion using drought-tolerant vegetation requiring infrequent drip irrigation. No pressurized irrigations shall be placed at or near the tops of graded slopes. Significant Impact Impact 4.4-3: Some residences would be constructed near slopes with colluvial materials. These slopes, and slopes constructed as part of the project, could become unstable and potentially result in on-or off- site damage. Finding Changes or alterations have been required in, or incorporated into,the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential impacts related to slopes with colluvial deposits to a less-than-significant level: LUND RANCH II(PUD-25)RESIDENTIAL PROJECT 1 0 FINDINGS