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:Am: <br /> TABLE 1. LAND USE, IMPERVIOUS COVERAGE, AND PREDICTED <br /> CHLOROPHYLL CONCENTRATIONS <br /> PREDICTED <br /> IMPERVIOUS COVERAGE CHLOROPHYLL <br /> LAND USE SCENARIO (% OF TOTAL WATERSHED) (UG/L) <br /> ( 1 ) ALL FOREST 0. 5 10. 8 <br /> (2) EXISTING LAND USE 3. 6 19. 2 <br /> (3) 5-ACRE LOTS, PER CDM 6. 3 22. 4 <br /> (4) 5-ACRE LOTS, 2 ACRES IN CHATHAM 6. 4 22. 7 <br /> (5) EXISTING LOTS GRANDFATHERED 6. 7 23. 4 <br /> ("CDM PLUS") <br /> (6) PLUS 5 2-ACRE LOTS PER FAMILY 7. 1 24. 5 <br /> (THE "OCTOBER PLAN" ) <br /> (7) INCREASED IMPERVIOUS LIMITS 7. 4 26. 2 <br /> . (THE- "FEBRUARY PLAN") <br /> (8) ALL 2-ACRE LOTS 7. 6 27. 4 <br /> (9) CURRENTLY APPROVED L. U. PLANS 8. 1 28. 2 <br /> (10) ALL 1-ACRE LOTS 11. 9 32. 4 <br /> NOTES: <br /> (1 ) Assumes no development in watershed; 95. 5% forest, 0. 5% <br /> roads. <br /> (2) Actual land use, as estimated by CDM, using characteristic <br /> impervious coverage with each land use: 4% for 5-acre lots, <br /> 6% for 2-acre, 12% for 1-acre, etc. <br /> (3) Assumes 90% buildout of all undeveloped land at a density of <br /> 1 unit per 5 acres. Does not account for existing lots of <br /> record that may be smaller than 5 acres. <br /> (4) Same as (3) , except that Chatham County develops at 1 unit <br /> per 2 acres. <br /> (Continued) <br />