Amendment 0004_1988_71 penetration graphs.jpg

This document is a technical graph displaying penetration data measured in feet (ft) over time. The chart presents penetration rates across multiple test intervals, with the y-axis showing penetration depth in feet per hour (in./ft-1) and the x-axis displaying time intervals marked from 0 to 26 hours. The graph includes data from what appears to be drilling or boring operations conducted in the New York District area by the U.S. Army Corps of Engineers.

The chart legend indicates three data series: (Y = 5800902), (X = 2200 STATE TRANSVERSE MERCATOR), and (LOCATION AREA: BRIGHT BOUNDARY AREA MERCURY AREA). The penetration measurements show variable rates throughout the test period, with notable fluctuations occurring between hours 8 and 20. The data appears to reference specific date markers (Sand, Etc. @17° 28.5', Sand, Etc. @12° 5'-14.0', and Core No. BB-71 @0-12.5'), suggesting multiple sampling locations or testing protocols within the surveyed area. The graph serves as a technical record for subsurface investigation or geotechnical assessment purposes.