groundwater EDITEDDuffield Associates has been involved in many projects involving the evaluation of surface water and groundwater supplies, in addition to evaluation of groundwater contamination.  Duffield Associates has also been involved in numerous groundwater studies for new water supplies for developing areas.  These groundwater studies have been performed for public water utility companies and the evaluations have included well installations and aquifer testing.   Further more, evaluations have been performed on different water bearing zones within an aquifer to assess the influence of tidal activity.