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L l Ilvir011111ental Data Resources, Inc. Historical Topographic Map Report LEnvironmental Data Resources, lnc.'s (EDR) Historical Topograpinc Map Report is designed to assist professionals in evaluating potential liability on a target properly, and its surrounding arca, resulting from L past activities. ASTM E 1527-00, Section 7.3 on Historical Use hnforination, identifies the prior use requirements for a plhase I cnviromncntal site assessment. The ASTM standard requires a review of reasonably ascertainable standard historical sources. Reasonably ascertainable is defined as L information that is publicly available, obtainable from a source with reasonable time and cost constraints, and practically reviewable. L To Hied the prior use requirements of ASTM E 1527-00, Section 7.3.2, the following standard historical sources may be used: aerial photographs, city directories, fire insurance maps, topographic maps, property tax files, land title records (although these cannot be the sole historical source consulted), building department records, or zoning/and use records. ASTM E 1527-00 requires "All obvious uses of the L property shall be identified from the present, back to the property's obvious first developed use, or back to 1940, whichever is earlier._ This task requiresreviewing only as many of the standard historical sources as are necessary, and that are reasonably ascertainable and likely to be usejul." (ASTM E 1527-00, Section 7.3.2 page 11.) EDR's Historical Topographic Map Report includes a search of available public and private color historical topographic map collections. "Topographic Maps LA topographic map (topo) is a color coded lute-and-symbol representation of natural and selected artificial features plotted to a scale. Topos show the shape, elevation, and development of the terrain in precise detail by using contour lines and color coded symbols. Many features are shown by lines that may be straight, curved, solid, dashed, dotted,.or in any combination The colors of the lines usually indicate similar classes of information- For example, topographic contours (brown); lakes, streams, irrigation ditches, etc. (blue); land gids and important roads (red); secondary roads and trails, railroads, boundaries, IL. etc. (black); and features that have been updated using aerial photography, but not field verified, such as disturbed land areas (e.g., gravel pits) and newly developed water bodies(purple). For more Dian a century, the USGS has been creating and revising topogapluc maps for the entire country at a variety of scales. ']lire are about 60,000 U.S. Geological Survey (USGS) produced logo maps L covering tlnc Unitod States. Lach nt�p covers a specific quadrangle (quad) defmod as a four-sided area hounded by latitude and longitude_ Historical topographic maps are a valuable historical resource for documenting the prior use of a property and its surrounding area, and due to their frequent availability can be particularly helpful when other standard historical sources (such as city directories, fire insurance maps, Lor aerial photographs) are not reasonably ascertainable. L L