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Phelan Development Holly Master Plan - Buildings H & 1 <br /> 15188.000.006 Geotechnical Exploration <br /> CATEGORY • . • <br /> WATER-SOLUBLE <br /> SULFATE IN SOIL <br /> % BY WEIGHT* <br /> Not applicable SO SO4< 0.10 <br /> S Moderate S1 0.10 :5 SO4< 0.20 <br /> Sulfate Severe S2 0.20 :5 SO4 :5 2.00 <br /> Very severe S3 SO4> 2.00 <br /> P Not applicable PO In contact with water where low permeability is not <br /> Requiring low required. <br /> permeability Required P1 In contact with water where low permeability is required. <br /> Not applicable CO Concrete dry or protected from moisture <br /> C C1 Concrete exposed to moisture but not to external sources <br /> Moderate <br /> Corrosion of chlorides <br /> protection of Concrete exposed to moisture and an external source of <br /> reinforcement Severe C2 chlorides from deicing chemicals, salt, brackish water, <br /> seawater, or spray from these sources <br /> * Percent sulfate by mass in soil determined by ASTM C1580 <br /> **Concentration of dissolved sulfates in water in ppm determined by ASTM D516 or ASTM D4130 <br /> Considering a `Not Applicable' sulfate exposure, there is no requirement for cement type or <br /> water-cement ratio; however, a minimum concrete compressive strength of 2,500 psi is specified <br /> by the building code. For this sulfate range, we recommend Type II cement and a concrete mix <br /> design for foundations and building slabs-on-grade that incorporates a maximum water-cement <br /> ratio of 0.50. It should be noted, however, that the structural engineering design requirements for <br /> concrete may result in more stringent concrete specifications. <br /> Based on the resistivity measurements, the soil is considered severely corrosive to buried metal <br /> piping. Values tested for chloride do not pose a significant impact to metals or concrete; however, <br /> groundwater is approximately 10 feet below existing grade. Therefore, we consider a moderate <br /> exposure to chlorides based on proximity to subsurface groundwater. <br /> A corrosion consultant should be retained to provide specific corrosion recommendations. <br /> 3.6 SHALLOW GROUNDWATER <br /> As discussed in Section 2.6, groundwater was encountered between 7 to 12'/2 feet below the <br /> ground surface. Depending on final site grades, groundwater could impact construction activities <br /> at some locations across the site. <br /> Shallow perched or high groundwater can: <br /> 1. Impede grading activities and underground utility installation. <br /> 2. Transmit moisture vapor through slabs causing excessive mold/mildew build-up, fogging of <br /> windows, and damage to computers and other sensitive equipment. <br /> ENGEOPage l 11 December 13, 2021 <br /> Expect Exceltence <br />