Ashby Farm - hydrostudy - Summary

EXECUTIVE SUMMARY GeoTrans conducted a hydrogeologic investigation of the proposed Ashby Farm subdivision approximately three miles north-northeast of Round Hill on behalf of Mr. Mark A. Simmons and Mr. Geoffrey T. Williams. Based on the results of literature review, well drilling, aquifer testing, water quality sampling and analyses, and evaluation of potential drawdowns and water-quality impacts, we conclude the following: (1) An adequate groundwater supply is available at the Ashby Farm site to support development of 24 residences on the 142-acre property. (2) Drawdowns to result from long-term domestic well pumping at Ashby Farm will probably not exceed two feet on adjacent properties ' within 500 feet of the site perimeter. Drawdowns at greater distances from the site will be even less. Drawdowns of less than two feet will not adversely impact nearby drilled domestic wells that are in ' compliance with current construction standards. ' (3) Bacteria migration from properly sited, constructed, and maintained drainfields will be very limited. Nitrate-nitrogen was not ' detected in groundwater (detection limit was 0.04 mg/L) at the two site wells tested. Nitrate-nitrogen contributed to the subsurface by septic drainfields will be diluted in the groundwater system. Alternate land uses, such as farming, may pose a greater threat of polluting groundwater with nitrate-nitrogen than onsite sewage treatment systems. 1 INTRODUCTION ' Mr. Simmons and Mr. Williams propose to develop Ashby Farm, a subdivision consisting of 24 lots on 142 acres, approximately three miles north-northeast of Round Hill on Route 719 (Figures 1 and 2). A preliminary plan of the Ashby Farm subdivision is given in Figure 3. ~~ GeoTrans, inc.