3322 BROADWAY COMPASS HEALTH 2025-10-03

Compass Health June 26, 2019 JN 19178 Page 2 SUBSURFACE The subsurface conditions were explored by drilling five test borings at the approximate locations shown on the Site Exploration Plan, Plate 2. Our exploration program was based on the proposed construction, anticipated subsurface conditions and those encountered during exploration, and the scope of work outlined in our proposal. The test borings were drilled on June 6, 2019 using a track -mounted, hollow -stem auger drill. Samples were taken at approximate 2.5 and 5-foot intervals with a standard penetration sampler. This split -spoon sampler, which has a 2-inch outside diameter, is driven into the soil with a 140- pound hammer falling 30 inches. The number of blows required to advance the sampler a given distance is an indication of the soil density or consistency. A geotechnical engineer from our staff observed the drilling process, logged the test borings, and obtained representative samples of the soil encountered. The Test Boring Logs are attached as Plates 3 through 7. Soil Conditions Test Borings 1, 2, and 3 were drilled along the lower, eastern side of the property. Beneath the ground surface, native, loose, weathered silty sand was encountered. This weathered layer was underlain by dense and very dense, slightly cemented, gravelly, silty sand at depths of approximately 3.5 to 4 feet and extended to the base of the test borings at depths of 16 to 21 feet where auger refusal was met. This dense and very dense soil is glacially compressed and is geologically referred to as glacial till. Test Borings 4 and 5 were drilled on the upper, western side of the site. Approximately 9 to 10 feet of loose fill was encountered beneath the existing grade. The fill was observed to contain brick and asphalt debris in Test Boring 4 on the northwestern portion of the site. The native glacial till was encountered beneath the fill, extending to the base of the test borings at depths of 22.75 to 25.5 feet where auger refusal again was met. Although our explorations did not encounter cobbles or boulders, they are often found in soils that have been deposited by glaciers. Groundwater Conditions No groundwater seepage was observed during drilling. However, it should be noted that groundwater levels vary seasonally with rainfall and other factors, with higher levels and greater amounts in the winter and early spring months. It is possible that groundwater could be found in pockets within the glacial till, and between the looser near -surface soil and the underlying glacial till, especially during these months. The stratification lines on the logs represent the approximate boundaries between soil types at the exploration locations. The actual transition between soil types may be gradual, and subsurface conditions can vary between exploration locations. The logs provide specific subsurface information only at the locations tested. If a transition in soil type occurred between samples in the borings, the depth of the transition was interpreted. The relative densities and moisture descriptions indicated on the test boring logs are interpretive descriptions based on the conditions observed during drilling. GEOTECH CONSULTANTS, INC.