APPENDIX F: EVALUATION OF APPROACHES TO DETERMINE RECHARGE AREAS 



Cape Cod Aqifer Management Project Final Report Page F-4 



elude comparison of the area of influence with area (zone) of 

 contribution and determination of the upgradient boundary of the zone 

 of contribution. The subject of data acquisition in terms of 

 requirements and costs should be described. This will allow the 

 determination of the benefits of a more realistic model (more accurate 

 Zone II delineation) relative to the expense of collecting the data 

 necessary to adequately define such a model. Action item - financing 

 is need for a modeling effort of this nature. 



2. It is recommended that an evaluation of the existing hydrogeological 

 data base take place in the pilot area. Action item - U.S. EPA Office 

 of Ground Water Protection is currently evaluating this situation; a 

 report to the Aquifer Assessment Committee is being prepared and 

 should be considered supporting documentation for this report. 



3. It is recommended that recharge data developed from Thornthwaite calcu- 

 lations be utilized in future delineations for Cape Cod. Sources of 

 this data are Strahler, Palmer, Guswa and Leblanc . No action - data 

 available . 



4. It is recommended that transmissivity data be developed from well 

 pumping test data as outlined in the DEQE Guidelines for 

 Public-Supply Wells. Action item - Guidelines are currently being 

 updated. 



5. It is recommended that withdrawal data be based on a standard recom- 

 mended percentage of the well capacity as determined in accordance 

 with the DEQE Guidelines for Public-Supply Wells. Action item - DE- 

 QE/DWS to provide Guidelines for percentage. 



6. It is recommended that criteria for initializing water-level condi- 

 tions be developed and the program for data acquisition be upgraded. 

 Action item - Local, state and federal governments have the responsi- 

 bility to design, create, and monitor an observation well network and 

 publish water-level data. The Aquifer Assessment Group has accepted 

 responsibility for providing detailed guidance for this action. 



7. The Zone of Contribution should be referred to as Zone II and deter- 

 mined in accordance with 310 CMR 24.00, Chapter 286, Acts of 1982. No 

 action - regulations exist. 



References Cited 



Walton, W. C. 1984. Practical Aspects of Ground Water Modellinp. 

 National Water Well Association, Worthington, Ohio. 



