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HazeltinelRoad Runners Rest II/Brinkmann-Woodward Gravel Pits Lining Project -Design Technical Memorandum Denver Water August 2003 4.3 Representative Cross Sections Based on the results of our subsurface exploration program, packer permeability tests, and knowledge of the local subsurface conditions, we developed six generalized cross sections to represent the subsurface conditions around the west, north, and east sides of the combined Hazeltine/Road Runners Rest IUBrinkmann-Woodward pits. The subsurface conditions used for each cross section are based on the subsurface stratigraphy and bedrock properties identified in the borings that are located within the section. The six representative cross sections are illustrated on Figures 4.2 through 4.7 and the general locations of each representative section are shown on Figure 4.1. The bedrock was modeled with 3 to 5 horizontal bedrock layers with varying thickness for each cross section and the fill and alluvial deposits that overlie bedrock were modeled as one horizontal ]ayer. A table with the depths, degree of weathering, and predominant material type for each horizontal bedrock layer is provided in Appendix B. The approximate stations where the cross sections are located, corresponding sections from previous analyses (GEI, 2001 b), and the representative borings from which the bedrock profiles were developed are shown in Table 4.1. TABLE 4.1 CROSS SECTION LOCATIONS Corresponding Cross Sections from GEI, Section A roximate Stations 2001 Re resentative Borin s 1 91+00 to 105+00; 118+00 to ~ E B-103, B-100, B-111, B-403, B- 129+50 ' ' 404, B-407, B-408 2 87+00 to 91+00; 105+00 to 118+00 F B-109, B-402, B-405, B-406 3 5+00 to 33+50; 49+50 to 57+75; P B-104, B-107, B-115, B-401 65+50 to 82+00 4 33+50 to 42+50; 57+75 to 65+50; B H I J, L M N, O B-101, B-105, B-106, B-108, 6- 82+00 to 87+00; 147+00 tD 148+00 , , , , 114, B-116, B-117, B-120 5 0+00 to 5+00; 42+50 to 49+50 K, O B-113, B-118 6 129+50 to 147+00 C B-102, B-112, B-409 The soil-bentonite cutoff wall was modeled as a 2.5-foot-wide zone extending from the ground surface downward into the bedrock Boundary conditions used were either constant head, no-flow, or review boundaries. A constant head boundary is a boundary where the water surface (head) remains constant. A no- flowboundary is aboundary where the flow of water is not allowed to enter or exit the model. GEI Consultants, Inc. 17 030500?-0)-31 IA-Hueliine Design TM