former was measured at 50 mhz and the latter at 20 khz both parameters increase with increasing liquid water content the research team again used a hammer drill to create the necessary test holes soil stiffness was measured using a 20 0 kg clegg impact soil tester cist and a dynamic cone penetrometer dcp the drop height used for the cist was 305 mm and three sets of four drops each were averaged for reporting at each test location the civ obtained from the cist is a measure of the peak deceleration of the hammer upon impact where 1 civ is equivalent to 10 gravities the dcp is comprised of an 8 0 kg dual mass slide hammer assembly used to manually drive a standard cone tip into the ground the penetration in mm blow is reported as a function of depth temperatures were recorded throughout the heating process in 10 minute intervals while electrical and stiffness measurements were obtained at both the beginning and end of the heating process where possible soil specimens were taken from both sites to enable determinations of soil classifications and in situ moisture contents site 1 u2014 the soil at site 1 was characterized as ol in the unified soil classification system and contained an average total gravimetric water content of 22 percent in the upper 305 mm as measured with a nuclear density gauge the average dry density of the soil in this zone was.