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• TABLE OF CONTENTS (continued) <br /> Historical Mining ................................ . 2.04-2 <br /> Las Animas County Land Use Classification .............. . 2.04-3 <br />2.04.4 CULTURAL AND HISTORIC RESOURCE INFORMATION .. . 2.04-3 <br />2.04.5 GENERAL DESCRIPTION OF HYDROLOGY AND GEOLOGY 2.04-4 <br />2.04.6 GEOLOGY DESCRIPTION ......................... . 2.04-4 <br /> Alluvium/Colluvium .............................. . 2.04-7 <br /> Overburden ................................... . 2.04-7 <br /> Ciruela Coal ................................... . 2.04-7 <br /> Interburden .................................... . 2.04-7 <br /> Primero Coal .................................. . 2.04-8 <br /> Underburden ................................... . 2.04-8 <br /> Physical/Geochemical Properties ...................... . 2.04-8 <br />2.04.7 HYDROLOGY DESCRIPTION ...................... . 2.04-9 <br /> Groundwater .................................. . 2.04-9 <br /> Depth and Extent of Water Bearing Zones ............. . 2.04-9 <br /> Overburden ............................. 2.04-9 <br /> Ciruela Coal ............................ 2.04-9 <br />• Interburden ............................. 2.04-9 <br /> Primero Coal ........................... 2.04-10 <br /> Underburden ........................... 2.04-10 <br /> Aquifer Characteristics and Water Quantity ............. 2.04-10 <br /> Alluvium .............................. 2.04-11 <br /> Overburden ............................ 2.04-13 <br /> Ciruela Coal ............................ 2.04-14 <br /> Interburden ............................ 2.04-15 <br /> Primero Coal ........................... 2.04-17 <br /> Underburden ........................... 2.04-19 <br /> Water Quality ................................ 2.04-21 <br /> Alluvium .............................. 2.04-21 <br /> Overburden ............................ 2.04-22 <br /> Ciruela Coal ............................ 2.04-22 <br /> Interburden ............................ 2.04-23 <br /> Primero Coal ........................... 2.04-23 <br /> Underburden ........................... 2.04-24 <br /> Windmills ............................. 2.04-24 <br /> Surface Water .................................. 2.04-25 <br /> Watershed Delineation and Drainage Basin Characteristics ... 2.04-25 <br /> Flow, Crest, and Storm Events ..................... 2.04-27 <br /> Water Quality Data Summary . <br />. 2.04-29 <br />• ::::::::::::::::::: <br />Surface Water Stations 2.04-29 <br />ii (revised 10-8-O1) <br />