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File No. S-1182-3 <br /> May 31, 1972 <br /> PAGE; THREE <br /> in thickness. The sand is underlain by light-brown clayey <br /> silt to the depths explored. More detailed descriptions of <br /> the soils encountered are noted on the Logs of Borings , <br /> Plates V through VIII. All soils have been classified in <br /> accordance with the Unified Soil Classification System, <br /> described on Plate IV. <br /> Groundwater was encountered at depths varying from 20�2 <br /> to 48 feet below existing ground surface at time of drilling. <br /> The depths at which the water level rose after drilling are <br /> noted on the Logs of Borings ® It is possible that these <br /> water levels could change in the future due to variations <br /> in rainfall, pumping, or other factors not apparent at the <br /> time these measurements were made® <br /> 1ABORATORY TESTS <br /> Chemical tests were made on samples of the plant process <br /> water, the groundwater, and on selected soil samples . The <br /> tests performed on the water samples , according to your <br /> requirements, included pH, dissolved, suspended, and settle- <br /> able solids , total hardness , calci=4 chlorides, sulfates , <br /> 4 <br /> sodium, potassium, bio-chemical oxygen dand and aluminum. <br /> The tests on the soil samples were made to determine whether <br /> there is any .significant change in the chemical characteristics <br /> of the soils with depth. It was assumed that certain indicator <br /> tests would reveal such changes . The tests selected for the 5 <br /> soil' samples included pH, total hardness, and dissolved solids . <br />