SECTION 252:616-7-7. Concrete liners

(a)   Suitability. A liner system constructed with a soil subbase, a specially prepared subgrade, and reinforced concrete is a highly protective liner system and may be used for Class I, II, III, and V wastewater.

(b)   Pre-construction requirements. Before construction, classify and test all liner material and submit the following with the industrial wastewater treatment permit application:

(1)   test the concrete liner material for both chemical and physical properties that show the concrete is compatible with the wastewater by using actual or synthetic wastewater; and

(2)   determine an appropriate water-cement ratio based on maximum strength requirements and operational conditions.

(c)   Construction requirements. Construct a concrete liner as follows:

(1)   prepare the subgrade to prevent differential settling under maximum operational conditions;

(2)   mix the concrete with water free of oil, grease, acids and alkalis, and under 2000 ppm turbidity with minimal sulfates;

(3)   pour concrete liners monolithically, at least six inches thick and reinforced for impoundment stability and to prevent cracking or fracturing during maximum operating conditions; and

(4)   construct concrete liners with 3000 pounds per square inch compressive strength concrete as determined after 28 days curing time by standard concrete compression test.

[Source: Added at 17 Ok Reg 1925, eff 6-12-00]