The Spear repeat contained a map (?ol# 1^ sheet 6^ opposite p« 108) sh0iri.ng 

 the coisfigtaration of the water table on JtOy 1^ 1907^ in that part of Suffolk 

 Cotmty lying irest of Riverhead^ in addition to the above mentioned nater-table 

 aaap of Queen© and Nassan fcr 190S (idlm 1» sheet 1^ opposite p» 60) republished 

 from the Burr-Hering-Freeman report* The contour internal was five feet* All 

 elevations we^re referred to a neir dattm 1*72 feet below the dattim of the 

 Brooklyn Water Departiaent# 



General agreeiaent was shown between the Spear map of 1907 of western Suffolk 

 County and the Burr-Hering-FreeHian map of 1905 covering the saiae area. Maiy of 

 the wells put down during the 1903 investigation were later used by the Board 

 of Water Si35)ply* In addition, about 500 two-inch test wells were driven in the 

 area to augoaent those wells and other existing wells available for observation. 



Caution in the interpretation of tte water-table contours in certain areas 

 was again urged in the Spear report, as the following quotations from pages 108 

 and 109 will show: 



"The ground-water contours shown here define, however, oaaly the 

 main surface of saturation* In the laoraines, local beds of clay 



48 



and boulder till maintain elevated water-tables that are much 

 higher and quite independait of the main starface of saturation* 

 Between these elevated or "perched" water-tables »•«•*««• 

 and the main water-table below, the strata are only partially 

 saturated* • « • 



"There are but few observations upon the surface of the main 

 water-table beneath the high and cosqpact morainal ridges ^ and the 

 ground-water contours there are drawn in a general way from the 

 observations in wells outside of these areas* This lack of infor- 

 mation in these areas does not appreciably affect the accuracy 



