Results
Thirty-eight samples were collected for 615N and nitrate-nitrogen
analyses:  two in Lowes Creek subdivision (Figures 2 and 3), nine in Oak Park
subdivision (Figures 4 and 5), five in Pine Grove-Deer Park subdivision
(Figures 6 and 7), three in Briarwood subdivision (Figures 8 and 9), eight in
Sandy Knolls subdivision (Figures 10 and 11), and eleven in Mill Run
Subdivision (Figures 12 and 13). Table 4 presents the mean and standard
deviation of the 615N and nitrate-nitrogen values for each subdivision. The
mean 61N for all measurements is 6.2 + 1.6 and the mean NO3-N value for all
measurements is 10.6 mg/L + 4.3 mg/L. The correlation coefficient between
615N versus nitrate-nitrogen for each well is 0.10 which is <90% significant
by the t-Test (Davis, 1986).
Discussion
Figure 14 shows the range of 615N for each subdivision; the range of
6 15 presented by Gormly and Spalding (1979) for fertilizer N, fertilized soil
NO -N, soil organic N, unfertilized soil NO -N, and animal waste N; the
3                                         3
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average 6 N (10.9) plus and minus one standard deviation for septic tank
waste and the average 61N (12.4) plus .and minus one standard deviation for
animal waste as presented by Wolterink et al. (1979); the range of 615N for
fertilizer, cultivated land, unfertilized land, and animal waste in West Texas
as presented by Kreitler (1979); the average 615N (0.2) for fertilizer used at
a potato farm on Long Island, New York and the average 915N (6.2) for ground
water beneath the potato farm as presented by Flipse, Jr. and Bonner (1985);
and the average 615N (-5.9) for fertilizer used at a golf course on Long
Island, New York and the average 615 value (6.5) for ground water beneath the
golf course as presented by Flipse, Jr. and Bonner (1985).

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