Agenda - 11-01-1993 - VIII-A - Laserfiche WebLink

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/7- 7- 73 ORANGE COUNTY PLANNING DEPARTMENT MEMORANDUM TO: COMMISSIONER ALICE GORDON • FROM: DAVE STANCIL 4S Comprehensive Planner II/Land Use and Environment DATE: October 28, 1993 SUBJECTS: 1) LITTLE RIVER/LAKE MICHIE "MOST CRITICAL ZONE" 2) TREYBURN INTERNAL TOPOGRAPHY AND HYDROLOGY On Tuesday evening, you asked me to gather information about the above issues regarding Little River watershed. I am writing to inform you of my findings . As suggested, I am providing a copy of this material to members of the Board of Commissioners, the County Manager, and Planning staff involved in watershed planning. First, I have copied excerpts from the 1989 Watershed Management Study: Little River/Lake Michie Watersheds that deal with the "most critical zone" in terms of pollutant travel time to the reservoirs. I have attached the entirety of Section 3 .4, "Nonpoint Pollution Loading Model" . Most of the narrative deals with modeled delivery ratios for pollutants entering streams in the watersheds. At the top of page 3-23, the "most critical zone" concept is defined as the area within a 12-hour travel time to the reservoir. The following page, figure 3-3, shows the boundaries of the "most critical zone" (shaded) . I have also enclosed sub-sections 8 . 1 - 8.4 of the "Recommended Watershed Management Plan" . On page 8-4, the middle paragraph references the critical zone shown on Figure 3-3 as a fallback recommendation, if the study recommendation of land use controls (two-acre lots and six percent impervious surface limits) for the entire watershed are not found to be feasible. In regard to Treyburn, you asked about the internal topography and hydrology of the project as it relates to the water intake of the adjacent Little River Reservoir. I have spoken with Dick Hails, Assistant Director of the Durham City-County Planning Department on this subject. Please find attached excerpts from the approved 1985 Treyburn rezoning, including text and a map showing hydrology/climate, plus a table and map on the land use pattern of this mixed-use development. In addition, I have a larger map of the topography and hydrology on loan from Durham. In general, there are two portions of Treyburn that adjoin the Little River Reservoir, referred to respectively as the east, or "right" bank; and the west or "left" bank.