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Well Data Sheet Instructions(Rev. 11/99), Page 5 casing materials are steel,plastic (PVC), and fiberglass(less common). Conductor casing used? A conductor casing is a shorter,oversized casing that is used to stabilize the borehole during construction of a well. Older well drillers' Iogs do not clearly identify if conductor casing was used. Enter"Unknown"or leave the field blank if you are not sure that a conductor casing was used. Conductor casing removed? The conductor casing is generally removed during installation of the ' annular seal. The well drillers' log does not clearly identify if conductor casing was pulled out. This information may not be readily available, unless the well was recently constructed. Enter "Unknown"or leave the field blank if you are not sure. Depth to highest The depth to the first perforations should be entered in feet below perforations/screens ground surface. If the information is not available enter "Unknown". Screened interval beginning The beginning depth of the first screened interval should be entered depth/ending depth in feet below ground surface,followed by a slash(/)then the ending depth of the interval should be entered. If there are more screened intervals they should be entered the same way separated by a semicolon from the previous one. The field length can accommodate several screened intervals. Total length of screened interval The length of all the screened intervals should be added and the value placed in this field, See notes at end of this guidance for r additional information. Annular Seal? A cementous material placed within the annular space between the casing and the borehole of the drilled well. Sometimes called "sanitary seal". Enter"Yes","No"or"Unknown"as appropriate. Depth of Annular Seal The depth in feet from the ground surface.to the bottom of the annular seal. Material of Annular Seal Typical materials for an annular seal include Neat Cement, Sand Cement, Concrete and Bentonite_ Gravel Pack, depth to top Gravel pack is a specific type and size of gravel material that is placed in the annular space between the borehole and the well casing. The gravel pack allows water to enter a well more freely and can filter out finer sands and silts. In this field enter the depth in feet to the top of the gravel pack material. Total Length of Gravel Pack Enter the total length in feet of gravel pack placed in the well. If there are multiple layers of gravel pack, total the lengths and enter here. AQUIFER Aquifer materials In this field we are trying to get an idea of the materials that are in the aquifer from which the well draws. The best source of information is the geologic log information on the well drillers' log_ If this is not available, local knowledge of the area or nearby wells may be used. List all the materials that apply: Sand, Silt, Clay, Gravel, Rock,Fractured Rock. There may be other materials that are encountered such as cobbles, boulders,shells, glacial flour, etc. These may be listed on the MMS if they are a dominant feature in the well log, and are not adequately described by the materials listed above.