<simpleType name="InvestigationTargetEnumType">
  <annotation>
    <documentation>A controlled list that indicates the target being investigated by this feature: Deep Foundation - investigation of deep foundation elements. Earthworks - earth materials excavated and/or emplaced by engineering activity. Ground Improvement - activities designed to alter the characterstics of natural ground. Ground Water - hydrology and chemistry of ground water. Indoor Atmosphere - meteorology and chemistry of air in indoor spaces. Material Sample - a sample of material not derived from other enumerations in this list. Natural Ground - earth materials sampled in natural or undisturbed state. Outdoor Atmosphere - meteorology and chemistry of air in outdoor spaces. Surface Water - hydrology and chemistry of surface water.</documentation>
  </annotation>
  <restriction>
    <simpleType>
      <restriction base="string">
        <enumeration value="Deep Foundation">
          <annotation>
            <documentation>Investigation targeting deep foundation elements (piles, drilled shafts, caissons, and other deep load-bearing systems).</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Earthworks">
          <annotation>
            <documentation>Investigation targeting earthwork construction (fills, embankments, cuts, and other earth moving activities).</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Ground Improvement">
          <annotation>
            <documentation>Investigation targeting ground improvement systems (grouting, soil mixing, compaction, and other ground modification techniques).</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Ground Water">
          <annotation>
            <documentation>Investigation targeting groundwater conditions, hydrology, chemistry, and properties.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Indoor Atmosphere">
          <annotation>
            <documentation>Investigation targeting indoor air quality, atmospheric conditions, and contaminants in enclosed spaces.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Material Sample">
          <annotation>
            <documentation>Investigation targeting specific material samples for characterization that do not fit other categories.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Natural Ground">
          <annotation>
            <documentation>Investigation targeting natural, undisturbed ground conditions and properties.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Outdoor Atmosphere">
          <annotation>
            <documentation>Investigation targeting outdoor air quality, atmospheric conditions, and meteorological parameters.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Pipeline">
          <annotation>
            <documentation>Investigation targeting pipeline installations, corridor conditions, or pipeline-related geotechnical concerns.</documentation>
          </annotation>
        </enumeration>
        <enumeration value="Surface Water">
          <annotation>
            <documentation>Investigation targeting surface water bodies, hydrology, chemistry, and conditions.</documentation>
          </annotation>
        </enumeration>
      </restriction>
    </simpleType>
    <whiteSpace value="preserve"/>
  </restriction>
</simpleType>