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' • KLEINFELDER 1 moist, and stiff to approximately 16 feet bgs, where silty sand (ML) was encountered to ' approximately 28%2 feet bgs. The silty sand was observed to grade to a sandy silt (ML) to the bottom of the boring. No free groundwater was encountered in soil boring GT-3. ' GT-4 was drilled south of the Musco processing facility in the area of the proposed spray application field near the southern boundary of the northeast region of the site. The subsurface tsoils in GT-4 were classified as dark brown sandy silt (ML), to a depth of approximately 6 feet bgs. The soil graded to light brown silt with olive gray mottling, and sandy silt to an ' approximate depth of 14 feet bgs. Brown sandy clay (CL) was encountered to approximately 25 feet bgs, with increasing sand content and iron staining to approximately 29 feet bgs. Gray to ' light gray clay (CL) was observed to the bottom of the boring. No free groundwater was encountered in soil boring r:T-a Please see the attached soil boring logs in Appendix B for a complete stratigraphic description of the soils encountered in the soil borings. ' 5.1.2. Deep Soil Borings and Groundwater Sampling and Analysis ' The soil borings drilled near the existing 1 million gallon pond and the proposed 72 million gallon pond were drilled to asses the subsurface soils, in particular the clay or aquitard material, and groundwater. One soil boring (TW-1) was drilled near the south end of the 1 million gallon pond. The second soil boring (TW-2) was drilled in the area of the proposed 72 million gallon ' pond in the northern portion of the southwest region of the site. ' The soil borings were advanced into first encountered groundwater. Soil samples were collected for lithologic field analysis. Samples of clay material were collected as they were encountered ' for laboratory analysis. Groundwater samples were also collected from each boring for laboratory analysis. ' TW-1 was drilled to a depth of 120 feet bgs. The boring was advanced until clay was encountered at approximately 111 feet bgs. Groundwater was first encountered at approximately ' 9595 feet s. During the advancement of TW-1 sandy silt (ML) was encountered to a depth of approximately 33 %2 feet bgs. A layer of sand (SP) was logged to a depth of approximately 44 feet bgs, where ' sandy silt was again seen to approximately 60 feet bgs. Clayey silt was encountered in boring 20-2594-03.004/201IR447 Page 10 of 16 ' Copyright 2001 Kleinfelder, Inc. June 8,2001