CHAPTER 4 - THE TECHNICAL BASIS FOR GROUNDWATER PROTECTION 



Cape Cod Aquifer Management Project Final Report Page 21 



The inventory identified 215 wells in the eastern half of Barnstable. 

 The Aquifer Assessment Committee then screened these wells for potential 

 selection for water level measurement. CCAMP criteria for well selection 

 included location, ownership, access, well construction, elevation rela- 

 tive to mean sea level, well depth and screened interval (a screen at or 

 near the water table was desired) . The initial 215 were narrowed down to 

 fewer than 100 wells and these were all field checked to ensure accessibil- 

 ity. During this initial field check, CCAMP also recommends a slug test 

 to test each well's responsiveness to actual water-table conditions. An 

 array of 71 wells and seven ponds was finally selected to create a uniform 

 geographic distribution of measuring points. 



The inventory was then used to prepare a water-table contour map. The 

 selected measuring points (measured on May 11-13, 1987) provided an exami- 

 nation of water-table conditions under periods of high-water table, in the 

 late spring. The water-table map that was developed from this effort is 

 very detailed, with one -foot -contour intervals in the center of the study 

 area. A discussion of the results are presented in Appendix C, "Water 

 Table Elevations in Eastern Barnstable, Massachusetts". 



The observation-well inventory and subsequent water-level measurement 

 and water-table mapping demonstrated that through the use of existing 

 wells, detailed hydrogeological work can be performed. More observation 

 wells could have been used in the preparation of the CCAMP water-table map 

 by Heath (Appendix C) if more survey data were available. After the cost 

 of well drilling, surveying was identified as the most expensive cost 

 related to observation well installation. 



4.3. CCAMP Recommendations for Observation-Well Inventory 



CCAMP recommends the following: 



1. Municipalities or Regional Planning Agencies (RPAs) should main- 

 tain observation well data bases that contain all of the informa- 

 tion from Figure 4.1, the Well Description Form. 



2. All new wells drilled should be surveyed to mean sea level and 

 the owner should submit all the information from Figure 4.1 to 

 the relevant agency. 



3. The observation well data base should be maintained and its use 

 in developing localized water-table maps should be promoted. All 

 future entries to the data base and water-table map revisions 

 should be well documented and maintained. 



