﻿22 NEW YORK STATE MUSEUM 



Some of these are printed reports and records not directly con- 

 cerned with this enterprise, but whose information has been found 

 useful in this field. This is especially true of the first four sources 

 enumerated, I, 2, 3, 4. The last is a specific study with direct 

 reference to this project. 



Investigations were begun from the above vantage point. The 

 methods employed and the explorations conducted constituting the 

 further sources of information and furnishing the complete data 

 upon which all conclusions have been based include the following: 



6 Detailed topographic studies of the engineers of the Board of 



Water Supply 



7 Geologic field work making observations in detail of all geo- 



logic factors that seem to bear on the problem in hand 



8 Wash borings for depth to bed rock 



9 Chop drill holes through stony ground to bed rock 



10 Shot drill holes in bed rock 



11 Diamond drill holes 



12 Test pits and trenches for detail of drift structure 



13 Test tunnels in rock for working quality 



14 Deflection tests for holes that have swerved aside 



15 Pumping tests for underground water supply 



16 Pressure tests for rock porosity 



17 Microscopic examinations of rock types 



18 Laboratory tests of quality and behavior of materials. 



The mass of data accumulated from all these sources is surpris- 

 ing. For example, there are upward of 200 wash borings on the 

 different proposed Hudson river crossing lines alone; there are 69 

 drill borings and 177 wash borings on the site of Kensico dam; 

 there are 69 shot and diamond drill holes on the Rondout siphon 

 line aggregating 10,234 feet of rock core ; there are 65 drill holes of 

 various sorts on the Moodna creek siphon aggregating in total pene- 

 tration of drift over 10,000 feet; there are 106 borings, besides 

 several pits and trenches at Ashokan dam location. At every point 

 explorations suitable to the particular problems in hand were con- 

 ducted. The whole mass of data is conveniently recorded, much of 

 it is tabulated, some of it is represented graphically, samples of 

 nearly all of the material are available for examination, 1 and all 



1 The cores of all drillings and suitable samples of all boring's in drift 

 have been saved and properly labeled and are to be permanently housed at 

 some convenient point on the aqueduct line when completed. At present 

 they are cared for at the different division offices. 



