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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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Significant Impact <br /> Impact 4.4-5: Compressible soils and non-engineered fills are present within project boundaries and <br /> construction on these soils could cause foundation and other structural failures. <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 /> compressible soils and non-engineered fill to a less-than-significant level: <br /> Mitigation Measure 4.4-5: All existing non-engineered fill, vegetation, and soft or compressible soils <br /> and colluvium in existing canyons, creeks, stock ponds, drainages, and other areas to be graded shall be <br /> removed as necessary for project requirements. The depth of removal shall be determined by the <br /> geotechnical engineer in the field at the time of grading. Evaluation of unsuitable deposits shall be <br /> performed during grading by sampling and laboratory analysis. <br /> Significant Impact <br /> Impact 4.4-6: Fill placed during construction could settle following construction and cause structural <br /> 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 /> fill settlement to a less-than-significant level: <br /> Mitigation Measure 4.4-6a: The differential fill thickness across a lot should be less than 15 feet. Lots <br /> requiring local subexcavation of soil and replacement with engineered fill to achieve this limit should be <br /> identified on the final corrective action grading plan. <br /> Mitigation Measure 4.4-6b: Following clearing and stripping, all areas to receive fill, slabs-on-grade, or <br /> pavement should be scarified to a depth of at least 12 inches, moisture conditioned, and compacted to the <br /> requirements for engineered fill. <br /> Mitigation Measure 4.4-6c: Site soils and bedrock used for engineered fill shall have organic content of <br /> less than 3 percent. Rocks greater than 6-inches in size shall not be placed at depths greater than 10 feet <br /> from finished grade. Rocks greater than 18 inches in size should be broken down such that their <br /> maximum dimension is less than 12 to 18-inches, or placed in non-structural fills below slopes or under <br /> one of the proposed detention basins. Alternatively, these rocks could be used in landscaping and/or creek <br /> restoration projects. <br /> Mitigation Measure 4.4-6d: Engineered fills shall be compacted to the specifications stated in the <br /> geotechnical framework. Over compaction of expansive materials (with a plasticity index of greater than <br /> 12) should be avoided within the upper five feet of building areas. All fills shall be placed in lifts not <br /> exceeding 12 inches, or the depth of penetration of the compaction equipment used, whichever is less. <br /> LUND RANCH II(PUD-25)RESIDENTIAL PROJECT 13 FINDINGS <br />
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