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Open-File Report 2014–1020

Toxic Substances Hydrology Program
Prepared in cooperation with U.S. Department of the Navy

Transmissivity and storage coefficient estimates from slug tests, Naval Air Warfare Center, West Trenton, New Jersey

By Alex R. Fiore


Matches between slug test data and type curves are presented in figures 2 through 46. Estimates of T and S are compiled in table 1 (XLSX, 24KB). Owing to the subjectivity of analysis and data accuracy limitations of slug tests, results in table 1 are given to one significant figure (Cunningham and Schalk, 2011). For wells with measureable T, values of T range from 0.07 to 10,000 ft2/day. However, T is likely even smaller (<0.07 ft2/day) for 2BR, 18BR, 23BR, 25BR, 27BR, 30BR, 38BR, 40BR, 43BR, 44BR, and 46BR because water levels in these wells did not recover measurably from slug insertion after more than 20 minutes. Values of S range from 10-10 to 0.01. The mode of S is 10-10, with slug tests at 15 wells indicating that estimate. The range of T and S estimates span several orders of magnitude, which reflects the 3-dimensional heterogeneity of hydrogeological properties of the fractured bedrock at NAWC.

Water levels in 54BR (fig. 32) exhibited a response with a poor fit to the Cooper type curve, and 62BR fit poorly to the Butler type curve (fig. 39). Therefore, their values are likely less accurate. Poor results for these wells may be due to unsuitable assumptions prescribed by the chosen methods used for analysis. Application of other slug-test-analysis methods (Hvorslev, 1951; Bouwer and Rice, 1976) was also unsuccessful.

Photograph showing well 23BR at the Naval Air Warfare Center, West Trenton, New Jersey.
Well 23BR at the Naval Air Warfare Center, West Trenton, New Jersey.

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