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City of Santa Ana, CA I WATER RATE STUDY <br />Soils Analysis <br />To evaluate likely impacts to pipeline deterioration due to soil conditions along the pipe facilities, soil <br />data was downloaded from the US Department of Agriculture, National Resources Conservation Service <br />(NRCS). Several soils characteristics were then reviewed to determine if they may be contributing factors <br />to pipe failures and degradation. Although conclusive trends were not identified, key characteristics <br />were reviewed and area depicted in Table B - 8 and on Figure B - 22. <br />• Corrosion of Steel: since soils for almost the entire City has "high" Corrosion of Steel values, <br />there was minimal spatial variation over the area. Thus, this factor was ignored. <br />• Corrosion of Concrete: except for a small area to the south, the majority of soils for the City <br />have "Low" Corrosion of Concrete values. Only a very small area has "High" values. No obvious <br />relationship of this soil property to the main breaks was identified. Thus, this factor was ignored. <br />• Linear Extensibility: general indicator of the soils' capacity to shrinking or swelling due to <br />changing water content. <br />• Drainage Class: general indicator of the soils' capacity to retain water. <br />Table B - 8: Impacts on Breaks /Mile by Material <br />AC 1930s <br />Cl <br />all by age <br />Somewhat <br />drained <br />CMLC <br />CVL <br />19706 <br />DI <br />1970 -80s <br />Somewhat <br />drained <br />PVC <br />19805 <br />poorly C, D silt loam 7.5, 4.5 8.5, 8.2 Moderate <br />silty clay loam <br />poorly C, D silty clay loam 4.5 8.2 <br />silt loam <br />D clay 7.5 8.5 Moderate <br />BLACK & VEATCH I Appendix B: Water CIP Pnorftiz�P.cr ?roc =" <br />65B -117 <br />I()K. <br />