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01
City of Pleasanton
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CITY CLERK
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2016
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010516
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12/29/2015 3:26:28 PM
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CITY CLERK
CITY CLERK - TYPE
AGENDA REPORT
DOCUMENT DATE
1/5/2016
DESTRUCT DATE
15Y
DOCUMENT NO
01
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is not suitable for use as engineered fill may be used in approved open space of landscape areas, if <br /> approved by the landscape architect. <br /> Mitigation Measure 4.4-2c: All landscaped slopes shall be maintained in a vegetated state after project <br /> completion using drought-tolerant vegetation requiring infrequent drip irrigation. No pressurized <br /> irrigations shall be placed at or near the tops of graded slopes. <br /> Significant Impact <br /> Impact 4.4-3: Some residences would be constructed near slopes with colluvial materials. These slopes, <br /> and slopes constructed as part of the project, could become unstable and potentially result in on- or off- <br /> site damage. <br /> Finding <br /> Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the <br /> significant effects on the environment. <br /> Facts in Support of Finding <br /> The City of Pleasanton has adopted the following measures which will reduce potential impacts related to <br /> slopes with colluvial deposits to a less-than-significant level: <br /> Mitigation Measure 4.4-3a: Debris catchment walls shall be constructed along the rear sides of the <br /> building pads on Lots 14, 15, and 22 through 25 where they border adjacent slopes. The walls shall be a <br /> minimum of 5 feet high and designed in accordance with the recommendations of the geotechnical <br /> exploration in regards to retaining walls. Walls may not be required if pad grading provides sufficient <br /> space via rear yard slopes or retaining walls. The final design of the walls or catchment area shall be <br /> reviewed by ENGEO when the detailed project plans are prepared. Proper access to the catchment areas <br /> shall be provided and all debris catchment walls or designated catchment areas shall be periodically <br /> maintained by removing and disposing of accumulated slope detritus. <br /> Mitigation Measure 4.4-3b: Debris catchment measures shall be constructed along Lots 5 and 25 which <br /> are located at the mouths of existing drainage courses. The catchment measures shall include a minimum <br /> 5-foot berm placed across the mouth of the drainage with clog-resistant surface drainage inlets provided. <br /> The final dimensions, placement, and design shall be determined in the detailed project plans. <br /> Mitigation Measure 4.4-3c: The final corrective grading plans shall show detailed locations of keyways, <br /> subdrains, debris benches, and subexcavation areas. The sequence of grading issues, such as placement of <br /> various cut materials in specific locations, should also be evaluated during review of the final 40-scale <br /> grading plans. <br /> Mitigation Measure 4.4-3d: The Geotechnical Engineer or qualified representative should be present <br /> during all phases of grading operations to observe demolition, site preparation, grading operations, and <br /> subdrain placement. After grading operations commence, geologic observations of cut areas should be <br /> made at frequent intervals so that revised geologic recommendations can be incorporated into updated <br /> grading plans as grading proceeds. During slope grading, all cut slopes should be viewed by the <br /> Engineering Geologist for adverse bedding, seepage, or bedrock conditions that may affect slope stability. <br /> In the event that adverse conditions are identified, overexcavation and reconstruction of the slopes may be <br /> required. Track rolling to compact slope faces is not sufficient. All fill slopes should be overbuilt at least <br /> two feet and cut back to design grades. <br /> LUND RANCH II(PUD-25)RESIDENTIAL PROJECT 11 FINDINGS <br />
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