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<br />Ms. Laurie Anderson, P.E. <br />July 18,2001 <br />Page 2 <br /> <br />Project Geology: Based on review of local geologic literature and the numerous projects our <br />firm has previously conducted in this area, it is our opinion that a majority of the project is <br />located within an outcrop zone of the Pecan Gap formation, however, alluvial deposits such as <br />clayey sand and clayey gravel are located near the San Marcos River. The Pecan Gap consists of <br />expansive clay soil which transitions into shale. The clays and shales of this formation exhibit <br />high plasticity and are considered to be moderate to highly expansive. Another important feature <br />of this formation is the presence of localized slickensided fracture sets. The fractures are a direct <br />result of past fault movements of the ancient Balcones Fault Zone located just west of the project <br />area. Seepage water is often noted in the fracture zones of the Pecan Gap formation. Alluvial <br />deposits are anticipated along the San Marcos River and may also be present above the Pecan <br />Gap at locations near Cottonwood Creek. These soils, due to their more granular composition, <br />will tend to transport groundwater. <br /> <br />Field Exploration: Based on our review of the provided plan and profiles, boring locations and <br />depths were selected. Critical features such as roadway crossings and lift stations were selected <br />as first priority. After establishing these borings, intermediate locations were selected along the <br />alignment of the wastewater line near every 1,000 linear feet. Table 1 is provided as a summary <br />of the recommended boring locations and depths. <br /> <br />Table 1: Boring Schedule Summary <br /> <br />Boring No. Station Depth, ft General Comments <br />Al 20+00 17 Line "A" <br />A2 30+00 16 Line "A" <br />A3 38+25 25 North Side of Clovis Barker <br />A4 49+00 17 Line "A" <br />A5 59+00 16 Line "A" <br />A6 69+00 17 Line "A" <br />A7 79+00 16 Line "A" <br />A8 89+00 15 Line "A" <br />A9 95+25 20 South Side of Mc Carty Road <br />AlO 105+00 16 Line "A" <br />All 115+00 19 Line "A" <br />A12 125+00 16 Line "A" <br />A13 135+00 13 Line "A" <br />A14 145+50 19 Line "A" <br />B1 14+00 13 Line "B" <br />B2 24+00 16 Line "B" <br />B3 34+00 16 Line "B" <br />B4 44+00 19 Line "B" <br />B5 54+00 16 Line "B" <br />B6 64+00 15 Line "B" <br />B7 73+80 15 Line "B" <br /> <br />61 YPG365\613IPI53 <br />Copyright 2001 K1einfelder. Inc. <br /> <br />3601 Manor Road . Austin, Texas 78723 . (512) 926-6650 . (512j 926-3312 iax <br />