The classification of soil, at the proposed location of a seepage system, shall be determined by soil tests made as follows:
(A) For cesspools, a hole 4 inches to 12 inches in diameter shall be dug, extending to the depth of the proposed cesspool. For tile field, a hole 4 inches to 12 inches in diameter shall be dug, extending to the depth of the proposed trenches.
(B) Before observations are made, the pit shall be thoroughly wet down by filling it to a depth of at least 12 inches. The pit shall then be refilled with water to a depth of 12 inches or more and the rate of drop of water measured at intervals for a period of 30 to 60 minutes under normal conditions. The minimum or slowest uniform rate of drop shall be used in calculating seepage areas. When tests are made, consideration shall be given to the finished grade of building sites so that results will correspond to the absorptive value of the soil in which the leaching systems will be constructed. In investigating soil conditions for a large area, one test pit per acre or even one per lot may be required. Also, in investigating soil conditions, deep test pits may be required to check for ground water, ledge rock, or available good seepage soil below normal depths.
('66 Code, § 57-16)