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RM 1 of 3 <br />RM — Stomar clay loam, 0 to 2 percent slopes. This very deep, well <br />drained soil is on nearly level alluvial fans. It formed in alluvium <br />from sedimentary rock sources. Elevation is 40 to 300 feet. The <br />average annual precipitation 1s about 10 inches, the average annual air <br />temperature is about 60 degrees F, and the average frost—free period Is <br />about 270 days. <br />Typically, the surface layer is grayish brown clay loam about 17 Inches <br />thick. The upper 9 inches of the subsoil is brown clay loam. The <br />lower 21 Inches is brown clay. The substratum to a depth of 60 inches <br />or more is yellowish brown clay loam. It Is calcareous between the <br />depths of 17 and 60 inches. In some areas the surface layer Is silty <br />clay loam or loam. <br />included in this unit are small areas of Cap-_) clay, El Soiyo clay <br />willows clay and Pescadero clay loam.' Also included are small <br />seas of so is similar to Stomar soils with mottles at depths of 24 to <br />inches Or perched water tables at depths of 48 to 60 Inches. <br />i-.c.ucea areas make up about 15 percent of the total acreage. <br />permeability of t�,ls Stomar soii is slow. Available water caracjty 15 <br />n c`. Effective rootlna depth is 60 Inches_ or mere <br />anc the hazard of water — —on Is slight - <br />PR ELTMI NARY <br />light. <br />PRELTMINARY <br />SUBJECT TO REVISION. <br />13.3-46 <br />Runoff 1s 510-, <br />