SHI Builders West Orange NJ Prelim GI SWM Report 1

SUMMARY OF LABORATORY PHYSICAL/TEXTURAL RESULTS Moisture Liquid Plasticity Percent Boring Sample Depth USCS Content Limit Index Passing No. No. (feet) Classification (%) (%) (%) No. 200 (%) B-1 S-2 2-4 17.8 Not Plastic 33.4 GM B-2 S-3 4-6 15.2 Not Plastic 46.1 SM TP-1 S-1 1-2 15.1 17 Not Plastic 26.3 SC The engineering classifications are useful when considered in conjunction with the additional site data to estimate other properties of the soil types encountered and to predict the soil’s behavior under construction and service loads. Permeability Testing: Undisturbed tube permeameter tests were collected in general accordance with New Jersey Department of Environmental Protection (N.J.D.E.P.) Stormwater Best Practices Manual – Chapter 12: Soil Testing Criteria on representative samples obtained from anticipated stormwater management facility infiltration depths. Results of the permeability testing are included herein. 4.0 SUMMARY OF SUBSURFACE CONDITIONS 4.1 Site Geology The subject site is located in a region of the Piedmont Physiographic Province of New Jersey known as the Newark Basin. The Newark Basin contains rocks of the Newark Super Group and Brunswick Group which is a stratigraphic series of Triassic to Jurassic age igneous and sedimentary rocks containing intrusive sills and dikes as well as extrusive volcanics. The primary formation beneath the site is known as the Orange Mountain Basalt which includes basalts, greenish-gray to greenish-black, massive, pillow, and columnar jointed structures separated by thick beds of red siltstone or volcaniclastic rocks. The formation beneath the eastern portion of the site is known as the Passaic Formation of the Brunswick Group which includes thin to thick bedded siltstone and sandstone. Mud cracks, ripple marks, crossbeds and burrows are common. The overburden materials include residual soils derived from the underlying bedrock. Surficial geology at

k bedded siltstone and sandstone. Mud cracks, ripple marks, crossbeds and burrows are common. The overburden materials include residual soils derived from the underlying bedrock. Surficial geology at the site consists of the Rahway Till (Qwtr). The reported lithology consists of exposed clayey silt and sandy silt deposits and include pebbles and cobbles and few boulders directly desisted from glacial ice. Overburden material also include reworked on-site soils. 4.2 United States Department of Agriculture (USDA) Web Soil Survey Based on a review of the United States Department of Agriculture – Natural Resources Conservation Services (USDA-NRCS) soil survey, the near surface soils mapped underlying the subject site are summarized below: SHI Builders 4 4266-99-001E