(b) Frequency.

1. (1) Existing beaches. A sanitary survey may be conducted if indicated by the results of an unsatisfactory water sample.
2. (2) Proposed beaches. On proposed bathing beaches, a sanitary survey shall be conducted before construction or expansion.

(c) Scope.

1. (1) Existing beaches. The history of the bacteriological quality of the water shall be reviewed.
2. (2) Proposed beaches. The results of samples as required in 20 CAR § 139-108(b)(4), shall be reviewed by the division.

3. (3) Nature and sources of contamination. The nature of potential sources of contamination, including but not limited to:

   1. (A) Streams;
   2. (B) Unsewered residential areas;
   3. (C) Wastewater treatment plants;
   4. (D) Combined sewer and storm drain outlets;
   5. (E) Industrial outlets;
   6. (F) Sanitary landfills;
   7. (G) Open dumps;
   8. (H) Animal enclosures; and
   9. (I) Potential high erosion areas.

4. (4) Bather load.

   1. (A) History of average and peak bather load.
   2. (B) On proposed beaches, anticipated bather load.