Intensive Survey. An intensive survey is most useful when it is necessary to know precisely what historic properties exist in a given area or when knowledge of the actual boundaries of potential historic districts is desirable. In an intensive survey, the goal is to document all historic buildings, structures, sites, objects, and potential districts in sufficient detail to enable an evaluation of the property’s eligibility for listing in the National Register. As a result, intensive survey involves the inspection of every property in the area being studied (the special characteristics of thematic survey are discussed below). In intensive surveys of potential historic districts, non-historic properties must also be documented as noncontributing resources. As with reconnaissance survey, it is important that intensive survey fieldwork be preceded and accompanied by archival research (see section on Intensive Archival Research). As the survey progresses, archival researchers and field surveyors should interact closely. It is important that the project director integrate the two research efforts. Preliminary Preparation The first step is to define the boundaries of the study area. Next, assemble maps of the intensive survey area, including road maps, city or county planning maps, U.S. Geological Survey maps, and a complete series of plat maps and Xxxxxxx Fire Insurance maps. A complete series of aerial photographs is also useful. The plat maps and Xxxxxxx maps, in particular, can provide relative dates for the construction of most of the buildings in an area. Next, create a base map. For urban areas, the most recent Xxxxxxx maps are best. If Xxxxxxx maps are not available, a plat map may be substituted. Check with the city’s planning department for more map options. It is generally necessary to divide the survey area into manageable units, such as groups of city blocks or defined neighborhoods. You can organize the project to either survey each study unit one by one or assign a team to each. The survey team should be trained, supervised, and properly equipped. Each field surveyor should be familiar with local architectural styles, architectural terminology, photographic techniques, and the procedures for properly completing the Historic Preservation Resource Identification Form. Field Work An intensive survey should be carried out essentially on foot. All major buildings, structures, objects, and sites, and when possible all outbuildings and other ancillary structures and object...
Intensive Survey. Systematic, detailed examination of an area designed to gather information 32 about historic properties sufficient to evaluate them against predetermined criteria of significance 33 within specific historic contexts. In archaeology, this survey includes the excavation of larger areas 34 to evaluate, document and determine the importance, degree of integrity, extent, distribution, and 35 chronology of the archaeological resources identified during the Reconnaissance Survey.
Intensive Survey. If surface visibility is limited by crops or other ground cover, or if soil surveys indicate the potential for buried soils containing prehistoric living surfaces, then systematic surface probing and shovel testing will be used to increase confidence in survey results. Phase 1 surveys are documented in a report that conforms to format and content guidelines as established in Guidelines for Archaeological Investigations in Iowa (1999) and that is intended to convey the results of the survey to the project reviewers. Reports are always submitted by the consultant to the DOT, which checks them for format and content accuracy and then forwards them to SHPO and other consulting parties as appropriate for review and comment. On minor projects, the reports on historic structures and prehistoric archaeological components will be combined; on major projects with multiple sites and properties located, the reports will normally be separate to facilitate SHPO staff review.
