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March 26, 2001 NOA Environmental Project Number LE00-429 Page 7 shrink swell potential is high The effective rooting depth is limited by the hardpan ata depth of 20 to 40 inches Depth to the water tablets more than 5 feet, but water may be briefly perched above the hardpan after periods of heavy rainfall or irrigation Runoff is slow, and the hazard of water erosion is slight The rate of water intake in irrigated areas is 0 1 inch per hour The soil is subject to rare flooding, which occurs during years of abnormally high precipitation. Urban land consists of areas covered by roads, driveways, sidewalks,parking lots, buildings, and other structures The soil material under the impervious surface is stm&ir to that of Jacktone clay ' Where Jacktone soil is used for urban development, the main limitations are the high shrinkage potential, the slow permeability, depth to the hardpan, and low strength. The rare flooding is a hazard Properly designed foundations and footings and diverting runoff away from buildings help to prevent the structural damage caused by shrinking and swelling " ' On January 12,200, 1 Nett O Anderson&Associates conducted a geotechnical investigation of the subject property and found the foregoing sods description to be a fair representation of soils sampled on the subject property General Groundwater Conditions Reference is made to Table 1 for a description of the general groundwater conditions at the subject property M. PROPOSED SITE INVESTIGATION ' Soil Sampling Location Three soil borings will be advanced by a truck-mounted dell ng equipped with a hollow-stem auger at the former UST burial site The proposed soil sampling locations are shown in Figure 4 of Appendix A Drilling fluids will not be used while advancing the boring Soil samples will be collected at intervals of five feet(5') beginning at a depth of 10 5 feet below ground surface During the drilling process, soil samples will be analyzed for odor and discoloration The soil borings will be terminated either at the capillary fringe or three sample intervals below the last field detection of petroleum hydrocarbons The soil samples will be assessed in the field for the presence of odor and discoloration At the reeRso � M s s • O 1 7ssQ`�f