The- measuring and refilling operation is repeated until the water level drops are approximately stable. This occurs when three successive measurements do not vary by more than 5 percent. Final measurements at or after the point of stabilization are used to calculate percolation times.

Total depth of hole should be measured before and after the test measurements.

2. PRESENTATION

The percolation report shall be signed and sealed by a Civil Engineer or Certified Engineering Geologist licensed to practice in California and include the following:

a. TEST RESULTS

1. Describe test method used.
2. Provide test hole location map.
3. Provide logs of all test holes.
4. Provide copies of all field data and calculations. All data should be in tabular form.

b. DISCUSSION OF RESULTS

1. Discuss soil conditions encountered with regard to percolation rates obtained.
2. Discuss any variation in test results.
3. Discuss potential geotechnical hydrogeologic effects of percolation of retention basin water (mounding, hydrocollapse of near-surface soils, etc.).

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