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1 <br />' <br />CONTENTS <br />Section <br />Page <br />' <br />1.0 <br />EXECUTIVE <br />SUMMARY <br />1.1 <br />Summary <br />1-1 <br />' <br />1.2 <br />Conclusions <br />1-2 <br />1.3 <br />Recommendations <br />1-3 <br />' <br />2.0 <br />INTRODUCTION <br />2.1 <br />Purpose and Scope <br />2-1 <br />2.2 <br />Authorization <br />2-2 <br />' <br />2.3 <br />The Setting <br />2-2 <br />2.4 <br />Background Reports <br />2-4 <br />' <br />3.0 <br />EFFLUENT <br />LIMITATION AND WATER QUALITY <br />3.1 <br />General <br />3-1 <br />' <br />3.2 <br />Groundwater Contamination <br />3-1 <br />3.2.1 Saltwater Encroachment <br />3-2 <br />3.2.2 Irrigation Practices <br />3-4 <br />3.2.3 OnSite Waste Disposal <br />3-4 <br />' <br />3.2.4 Functions of a Septic Tank <br />3-6 <br />3.2.5 Design and Operation Guidelines <br />3-7 <br />' <br />3.3 <br />Groundwater Protection <br />3.3.1 Federal <br />3-12 <br />3-12 <br />3.3.2 State <br />3-12 <br />3.3.3 Local <br />3-13 <br />' <br />3.4 <br />Review of Existing Water Quality Reports <br />3-14 <br />3.4.1 Background <br />3-14 <br />3.4.2 Regulations <br />3-18 <br />3.4.3 Case Studies <br />3-18 <br />' <br />3.4.4 Water Quality Data in the Study Area <br />3-20 <br />3.5 <br />Summary <br />3-21 <br />' <br />4.0 <br />EXISTING CONDITIONS <br />4.1 <br />Physical Conditions <br />4-1 <br />4.1.1 Hydrology <br />4-1 <br />' <br />4.1.2 Soils <br />4-3 <br />4.1.3 Other Study Area Characteristics <br />4-4 <br />' <br />4.2 <br />Demographic and Land Use Data <br />4.2.1 County Demographic Data <br />4-4 <br />4-4 <br />4.2.2 Land Use Data <br />4-5 <br />4.2.3 Rockridge Study Area <br />4-5 <br />' <br />4.3 <br />Wastewater Flows <br />4-10 <br />4.4 <br />Performance of Existing Onsite Systems <br />4-14 <br />