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Enviro ctics <br /> An Earth Systems Company <br /> Well yields in Orange County show little correlation with topographic or hydrogeologic setting.8 <br /> One possible explanation for why well yields in Orange County show little, if any,correlation with topographic <br /> setting is local variation in the regional relation between drainage patterns and structures in the underlying <br /> bedrock. <br /> Recent studies have shown that some high-yield wells in the County apparently are associated with <br /> fracture-controlled drainage patterns and that lower yielding wells are located not only in topographic highs <br /> but also in topographic lows where the drainage pattern is not fracture controlled. <br /> Statistical value by topographic setting <br /> Number <br /> Well characteristic Valleys Hills and All wells of <br /> and Slopes ridges wells <br /> draws <br /> Average yielda 15.6 16.6 18.1 16.8 553 <br /> (gallons per minute) <br /> Median yield 10 10 10 10 553 <br /> (gallons per minute) <br /> Average yield per foot .092 .109 .136 .113 549 <br /> (gallons per minute per foot of <br /> total well depth) <br /> Median yield per foot .062 .057 .061 .061 549 <br /> (gallons per minute per foot of <br /> total well depth) <br /> Average depth(feet) 223.1 219.2 183.8 211.5 549 <br /> Median depth(feet) 200 185 167.5 185 549 <br /> Average casing(feet) 49.6 52.9 61.1 53.9 526 <br /> Median casing(feet) 42 47 60 50 526 <br /> Average water level 25.7 26.6 28.0 26.6 466 <br /> (feet below land surface) <br /> Median water level 25 25 30 25 466 <br /> (feet below land surface) <br /> Average saturated thickness of 22.8 26.5 33.4 27.2 446 <br /> regolith(feet) <br /> Median saturated thickness of 19 20 28 22 446 <br /> regolith(feet) <br /> 'Unadjusted for differeaices in depth sand diameter. <br /> Nearly all ground-water storage in the Piedmont ground-water system is in the regolith. The quantity of <br /> water stored in the bedrock is small by comparison. <br /> 8 https://pubs.usgs.gov/wri/2000/4286/wri2O004286.pdf <br /> Envirotactics, LLC Page 14 of 22 Hydrogeologic Desktop Study <br /> (732) 449-0077 Project No.6704 <br />