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71twas also noted that the consultant thought the 20.8 min/in perc rate "seems fast for clay loam <br /> soils." I have been documenting the exceptional permeability of the Tracy area clay soils for <br /> almost 30 years; my test results are not unusual. With regard to rainfall, the consultant states"The <br /> study states an assumption of 10 inches per year for rainfall recharge (R-Value),with no <br /> supporting rationale or reference." I have been using the San Joaquin County Isohyetal Map of <br /> Mean Annual Precipitation for the past 26 years. The EHD knows, or should know, this is the <br /> source of this data. <br /> This illustrates the problem of hiring outside consultants who are not familiar with local <br /> observations, or the documentation I have submitted to EHD, such as the Isohyetal Map, since I <br /> wrote the first Nitrate Loading Study for EHD, 26 years ago. <br /> In summary, as the civil engineer-of-record for this portion of the project, it is my professional <br /> opinion that the importation of an additional -3.5 feet of soil is unnecessary based on the <br /> discussions above. <br /> 41ofessio <br /> Respectfully submitted, sCa o D. Qes <br /> CHESNEY CONSULTING ti o �P o <br /> Q <br /> or. <br /> d No.7.5479 co <br /> ti <br /> Don Chesey, PE �!d fe of Cali4o�r1ro <br /> Registered Civil Engineer#C75479 <br /> CA Registered Nitrogen Management Specialist#341829 <br /> Page 3 of 3 <br /> Chesney Consulting <br />