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L <br /> Potential Potential > <br /> co co <br /> vD <br /> Significance Significance <br /> Without Mitigation With N -o <br /> Impacts Mitigation Mitigation Measures Responsibility Mitigation ca <br /> 0 <br /> degradation. Consider light grading equipment - N <br /> to avoid creating ruts in the subgrade, a <br /> situation that might require pumping. -p <br /> Remediate rutted subgrade areas by over- <br /> excavating the soft area to a depth of 18 to 24 <br /> inches, placing a geotextile at the bottom of the <br /> over-excavation, and backfilling with suitable <br /> granular material. <br /> • Do not use excavated Bay mud as fill beneath <br /> structures or pavement. When placing <br /> substantial fill directly on top of Bay mud,the fill <br /> might need to be placed in thin, uniformly thick <br /> lifts to prevent"mud waves"from forming. Mud <br /> waves can damage structural elements already <br /> installed, particularly piles and underground <br /> utilities. <br /> • The project civil engineer shall certify that all <br /> relevant provisions of the detailed, design-level <br /> geotechnical investigations have been <br /> incorporated into the grading and construction <br /> plans. <br /> • All earthwork and site preparation shall be <br /> performed under the direct supervision of a <br /> certified engineering geologist or geotechnical <br /> engineer. <br /> Implementation of these measures would reduce this <br /> impact to a less-than-significant level. <br /> Impact 11-5: Corrosive Soils. The soil on the S Mitigation 11-5: Require that the detailed, design- Applicant LS <br /> project site is classified as"severely corrosive"to level geotechnical investigations recommended m <br /> iron, steel, metal, and concrete. This condition could under Mitigations 11-1 and 11-2 include an <br /> result in long-term damage to building foundations evaluation of corrosive soils within the limits of all m <br /> -0 > <br /> S = Significant .0• m _ <br /> LS = Less than significant - a v <br /> SU = Significant unavoidable impact • c o <br /> NA = Not applicable <br /> T:I10695 Pete's Harbor EIR Addendumlrevised addendum no 2ITable 1-1(10695-01).doc <br />