Kill Van Kull serpentinite rock

In anticipation of dredging serpentinite and sediments in the contract area SKVK1, the New York District of the USACE ordered e4sciences|Earthworks to map the top of rock (perhaps diggable without blasting) and the top of intact rock (perhaps requiring blasting). We used existing borings (many obtained by e4sciences|Earthworks), unique multichannel seismic reflection, and unique resistivity surveys (with Demco). We produced maps and cross sections of the top of rock and the top of intact, high-velocity, and high-resistivity rock. The boring, seismic, and resistivity interpretations agreed on the top of rock. e4sciences|Earthworks estimated the total volume and area of rock. The sonar images demonstrated that while silt deposits exist in SKVK1, none of the silt possesses acoustic reflectivity indicating black silt. This result was confirmed by chemical and biological testing.