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Table 1 Notes <br /> Continued <br /> (5) Same as (4) , except that existing lots scalier than 5 acres <br /> are developed at their platted densities. <br /> (6) Same as (5) , except that owners may create up to 5 2-acre <br /> lots from existing parcels. (This scenario was proposed in <br /> the October 1989 13-Point Agreement. ) <br /> (7) Same as (6) , except that average impervious coverage is <br /> increased from 6 to 7% for two-acre lots, and decreased from <br /> 20 to 15% for half-acre lots, as proposed by Orange County <br /> on February 5, 1990. Chlorophyll concentrations were <br /> interpolated from values derived with the CDM model. <br /> (8) Assumes 90% buildout of all undeveloped land at a density of <br /> 1 unit per 2 acres. Does not account for existing lots of <br /> record that may be smaller than 2 acres. <br /> (9) Assumes 90% buildout according to currently approved local <br /> land use and zoning plans. <br /> ( 10) Assumes 90% buildout at density of 1 unit per acre. <br /> • <br />