This is a grain size distribution analysis chart, specifically a composite core sample from the Sea Bright Borrow Area (Boring No./Range 88-78, Elevation 0-30). The document presents particle size analysis data using a cumulative weight percentage curve plotted against phi distribution grain size values. The chart employs dual scales to display grain size classifications across multiple categories: coarse and fine gravel, coarse sand, medium sand, fine sand, and silt. The vertical axis shows percent coarse by weight (left side, ranging from 0.1 to 99.9) and percent finer by weight (right side), while the horizontal axis displays grain size in phi units (ranging from -4.5 to 4.0) with corresponding sieve measurements at the top. The curve indicates that approximately 84% of the sample consists of material finer than the 16% coarse threshold, with the majority of particles concentrated in the sand and fine sand ranges. This type of document is typically used in geotechnical investigations, dredging projects, or construction material sourcing to characterize soil and sediment composition for engineering or specification compliance purposes.
