2013-07-03_REVISION - M1985112 (3)

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I (4) Sand and Gravel: The gravel stratum was encountered at the surface and below the topsoil, upper clays, and silts at depths one -half (112) to five (5) feet below the surface and extends to the bedrock below. The sand and gravel is uen- erally poorly graded. The upper portion of the gravel stratu '..1 above the groundwater table contains minor amounts of silt and less coarse material. Thin lenses of clay were encountered within the gravel stratum in Borings 1 and 7. In general, the gravel contained is a maximum size of one and one -half (1 -112) inch, and a few small scattered cobbles ranging in size to six (6) inches in diameter were encountered in Boring �. (5) Sandstone- Siltstone Bedrock: The bedrock was encountered in Borings 1 through 5 at depths forty -one (41) to forty -six (46) feet below the surface. Bedrock was not encountered in the reriaining test borings to depths eight (8) to nine ('�) feet below the surface. The upper two (2) feet of the bedrock is highly weathered; however, the underlying interbedded sandstone and siltstone is firm to dense. (6) Groundwater: At the time of the investigation, free ground- water was encountered at depths three (3) to fifteen (15) feet below the surface. Water levels in this area are sub„ect to change due to seasonal variations and irrigation denands on and adjacent to the property. RECOMMENDATIONS AND DISCUSSION The test borings at the site indicate that the stratum varies in thickness from thirty -six (36) to eight and one -half (58 -1/2) feet and has an average than forty -eight (48) feet. The site is overlain b varies in thickness from one -half (1/2) to five (5) average thickness of approximately three (3) feet. sand and gravel greater than fifty - thickness of greater V overburden which feet and has an Based on the test