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(B) Perform laboratory tests as specified in Subsection (e) ; and (C) Field tests as specified in Subsection (f) . 1. The operator shall perform permeability tests in the test area under saturated conditions by using the standard test method ASTM Designation: D 3385-88 (approved 2/88] , ("Standard Test Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometers, 11 which is incorporated by reference, for vertical permeability measurements. A sufficient number of tests shall be ' run to verify the results. Other. methods that provide an accurate and precise method of measuring field permeability may be utilized as approved by the local enforcement agency and the Board. (D) Correlations between laboratory tests and test pad results shall be established for each of the various types of fill materials and blends to- be used in construction of the actual cover. (h) Earthen Material Requirements (1) The following minimum tests shall include, but not be limited to: (A) Laboratory tests as specified in Subsection (e) ; and (B) Field tests as specified in Subsection (f) and (g) . (2) The following minimum testing frequencies shall be performed: (A) Four (4) field density tests shall be performed for each 1, 000 cubic yards of material placed, or at a minimum of four (4) tests per day; (B) Compaction curve data (ASTM -Designation: D 1557-78)". -R graphically represented, and Atterberg limits (ASTM Designation:,-, D 4318-84) shall be .performed on the barrier layer material once a week and/or every 5, 000 cubic yards of material placed; r �M (C) For field permeability tests, representative samples shalloB be..performed .on barrier layer material; ) l.. .The frequency of testing may be increased or decreased, based on the pass/failure status of previous tests, as approved by the local enforcement agency and the Board. 2 . Field infiltration tests shall be -performed for the duration necessary to achieve steady conditions for the design permeabilityQ 3 . The following interpretive equation shall be used to determine,h the design permeability: -The infiltration rate (I) is defined as: I = Q/(tA) where: Q = volume of flow t = interval of time corresponding to flow Q A = area of the ring then the hydraulic conductivity (k) can be calculated from Darcy's . law as follows: k k1 where: I = infiltration rate A:-;,D i = hydraulic gradient. (i) Geosynthetic Membrane Requirements (1) Performance requirements for the geosynthetic membrane include, but are not limited to, the following: (A) a need to limit infiltration of water, to the greatest extent , possible; (B) a need to control landfill gas emissions; 111 7.8-17 (6/18/90)