31-9.3   Data to Accompany Tentative Map.
   The tentative map shall be accompanied by the following data, which shall be submitted at the time the map is filed with the Planning Department:
   a.   A written statement of general information which shall contain the following information:
      1.   Existing use or uses of property;
      2.   A description of the proposed subdivision, including the number of lots, their average and minimum size, and nature of development;
      3.   Source of water supply;
      4.   The method of sewage disposal proposed;
      5.   Other improvements proposed;
   b.   Two (2) copies of a preliminary geologic and/or soils reconnaissance report, as required by the Planning Department. Each report of a geological investigation shall be prepared and signed by an engineering geologist. Each report of a soil investigation shall be prepared and signed by a soil engineer. The required report should be based on the latest grading plan for the subject development and shall reference the date of the grading plan. The format for required reports shall generally follow the guidelines for geologic/seismic reports required by the Planning Department. All reports shall include the following:
      1.   A detailed geologic map showing the location and extent of any geologic hazard or potentially hazardous soil condition within or immediately adjoining the subject property which warrants special management and/or further evaluation;
      2.   Recommendations outlining an exploration program to fully define and delineate any geologic hazard or potentially hazardous soil condition, and to accurately identify developable areas;
      3.   Conclusions regarding the effect of any geologic hazard or potentially hazardous soil condition within or immediately adjoining the project site on the design of the proposed subdivision;
      4.   Recommendations for redesign of the subdivision and/or recommendations for construction procedures to mitigate potentially hazardous conditions, if warranted.
      The requirement for a preliminary geologic or soils reconnaissance report may be waived if the Planning Department determines that there are no apparent hazardous geologic or soils conditions within, adjacent to, or affecting the subdivision, based upon the geotechnical knowledge the Department possesses.
      For subdivisions of four (4) lots or less there is no mandatory requirement for a preliminary geologic or soils reconnaissance report. Such a report may be required if the Planning Department determines that there are apparent hazardous geologic or soils conditions within, adjacent to, or affecting the subdivision.
      An engineering geologist, within or retained by the Town of Danville, shall evaluate the reports required herein and advise the body having jurisdiction and authority. Supplemental reports and data may be required if deemed necessary;
   c.   When a tentative map is filed on an area which is a part of a larger single ownership which may be subdivided in the future, the Planning Department may require a development plan showing the proposed future development;
   d.   Four (4) copies of a preliminary grading and site development plan, including drainage, when required by the Planning Department.