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/ Recommended topsoil salvage depths are based predominantly on calcium carbonate content <br /> • <br /> and depth to bedrock. High calcium carbonate levels at the soil surface in isolated ridge <br /> and former swale positions may limit the salvage depth of suitable first lift topsoil. <br /> Baseline soil survey sampling results (Appendix 9-5-5) indicate an average of 3 and 7 <br /> inches of first lift topsoil can be salvaged from the Barx-scalped or Barx-buried soils, <br /> respectively. However, about 15 inches of first lift topsoil will be salvaged from Barx <br /> sandy loam if areas of this soil can be identified and isolated by additional premine <br /> sampling. <br /> The mean salvage depth for the D70B map unit is based upon the composition percentage of <br /> the three dominant soil types (Bari sandy loam, Barx-scalped, and Barx-buried) and one <br /> major inclusion (Progresso). The calculated mean recoverable suitable topsoil depth is <br /> 4.3 feet (Table 21-4). The first lift topsoil (0.8 feet) will typically include the <br /> neutral to mildly alkaline A and upper Bt horizons which have a moderately high to very <br /> high organic matter content and are generally slightly effervescent. The second lift <br /> topsoil (3.5 feet) will generally include the lower Bt, Bk, and C horizons. <br /> • 808 - Lithic-Typic Haplaquolls. This map unit complex occurs on nearly level to very <br /> gently sloping drainage channels throughout the study area. The soil depth within this <br /> map unit ranges from very shallow to deep. All soils have dark colored, organic matter <br /> enriched surface horizons and gleyed (mottled) subsurface horizons. Depth to ground water <br /> is typically less than 0.5 feet during the irrigation season. <br /> Recommended topsoil salvage depths are based dominantly on depth to sandstone bedrock. <br /> The shallowest soil, Lithic Haplaquoll, was discussed earlier under Soil Map Unit 1EW. <br /> Based upon 2 profiles, the Typic Haplaquolls (deep) have suitable topsoil to a mean depth <br /> of 55 inches, while the 1 profile of Typic Haplaquoll (moderately deep) was suitable to 24 <br /> inches. Topsoil salvage is restricted to these mean depths primarily due to sandstone <br /> bedrock at deeper depths. Additionally, topsoil will only be salvaged from this map unit <br /> if the profile is not saturated. <br /> The mean salvage depth for the 808 map unit is based upon the composition percentage of <br /> the three dominant soil types (Lithic Haplaquolls, Typic Haplaquolls-moderately deep, and <br /> Typic Haplaquolls, deep) and one major inclusion (Travessilla). The calculated mean <br /> recoverable, suitable topsoil depth is 2.4 feet (Table 21-4). A single mixed lift topsoil <br /> salvage technique will be utilized for this soil due to irregular organic matter contents <br /> 21-23 Revised 08/19/88 <br />