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i I Ecological!Evaludtion or Broveiil woods P.C. rlutck i NOTE: The folio Ing 3 pages replace page 3 in the 1989 report. Soils The report made to the Nature Conservancy in 1989 was based on soils inrormatloi) presented in the 1953 Soil Survey or San Joaquin County. in July 1990, a dart or a new San Joaquin County Sol I Survey became available. This section replaces and updates the inrormation in the 1989 evaluation of Broirel li Woods. The recently available San Joaquin Soil Survey ( 1990) presents more detailed soil Information than was previously available for this area. In the 1953 Soil Surveylon ly two major soils types were mapped within the boundaries of Broveili Woods. In the 1990 Sol] Survey, the Soil Conservation Service (UtA) lci�ntirled five soil types within the boundartes or the property now tali d Buckeye Ranch- Columbia fine sandy loam, 8ruella sandy loam, SanJoaquirtsandy loam. Kimball loam, Columbia, Bruellaland Kimball are considered prime agrIcultu al soils, however these soils comprise a relatively smal I proportion of the property and one of these, Columbia, lies beneath the oak forest. The soils map, redrawn by Bob Beit of Kjeldsen-Sinnock and Associates, inc., Stockton, CA, Is presented In Figure 2. i The so11s of Buckeye Ranch share three mayor characteristics: slow Permeability, and on underlying hardpan, and low erosion potential, Most of the soils, subsoils{, or claypans have a high clay content and are subject to seasonal shrinklnqand sweiling. Limitations Include 1 ) low permeability, of particular concer Ifor septic systems and irrigation, and 2) the need for well-designed roa s and buildings to avoid structural damage due to shrinking an¢ swe Ing of the soil. Management considerations for these soil include 1 ) reestric ng heavy equipment traffic from the soil when It is saturated, a4d 2) turning organic materials to the soil to maintain fertility and-avoldicrusting. in general, the erosion potential of the soils is Quite low. The distinctive woods or Buckeye Ranch, known for many years as Brovelli Woods, arf flourishing on Columbia fine sandy loams (CE). Columbia soils are esignated as prime agricultural soils. They are usually deeply channeled, tly drained, and frequently flooded. The main limitations or Colutnbia soils are slow permeability and the relatively shallow depth to thie hard substratum, a depth which averages about sixty � I S i � �0 d OTO oN 90 OT 367 7�-