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13 <br />STATE ENGINEER GUIDELINES FOR <br />LINING CRITERIA FOR GRAVEL PITS <br />AUGUST 1999 <br />1.0 Design Standard <br />The intent of the reservoir lining design is to achieve ground water inflow (leakage rate) <br />into the reservoir that is not greater than 0.03 ft3 /day /ft2 (1x 10 "5 cm3 /cm2 /sec) multiplied <br />by the length of the perimeter wall in feet multiplied by the average vertical depth of the <br />perimeter wall as measured from the ground surface to the pit bottom along the toe of <br />the pit side slope, plus 0.0015 ft3 /day /ft2 (5x 10 "7 cm3 /cm2 /sec) multiplied by the area of <br />the bottom of the liner system or natural bedrock bounded by the perimeter wall. <br />Appropriate geotechnical evaluations and analyses should be performed to indicate that <br />the Design Standard could be achieved with the proposed design to a reasonable <br />probability. It is recommended that the applicant submit design and construction plans <br />for review to the State Engineer. <br />2.0 Construction Standards <br />The applicant must demonstrate that the constructed liner meets the requirements of <br />the design by performing appropriate quality control observations and tests. The <br />applicant shall provide written documentation of the work performed and results of <br />quality control field and laboratory tests. Tests performed shall meet or exceed the <br />standards established by the American Petroleum Institute (API) and /or the American <br />Society of Testing and Materials (ASTM) as applicable. <br />3.0 Performance Standards <br />The Performance Standard shall be three times the Design Standard as described <br />above. The Performance Standard shall be applied to an initial test of competency of <br />the liner, as well as to the ongoing operation of the reservoir. <br />3.1 Initial Liner Test <br />For mined pits: The unregulated ground water inflow to the reservoir will be tested <br />by evacuating the contents of the reservoir and observing the inflow <br />of water over a period of ninety days. The start of the test will be <br />under essentially dry conditions. <br />