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i <br /> r <br /> UNDERGROUND TANK <br /> METAL EVALUATION GUIDELINES <br /> I. • If the'total metal concentration equals or exceeds the values listed below in Table 1,the waste extraction test* <br /> should be performed to determine the soluble fraction of the metal. If the total metal concentration is less than <br /> the values listed below, no further action is required. <br /> 1 <br /> TABLE 1 <br /> TOTAL METAL CONCENTRATIONS <br /> REQUIRING SOLUBLE FRACTION DETERMINATION } <br /> (mg/kg) <br /> DEPTH TO WATER<5' ALL OTHER DEPTH TO WATER.>30' I <br /> METAL PORO� US SOIL SITES 5%OR> CLAY CONTENT I� <br /> Lead 0.15 1.5 15.0 r <br /> Cadmium 0.05 0.05 0.5 <br /> Chromium 0.5 <br /> 0.5 5.0 <br /> Zinc 20.0 <br /> 200.0 2000.0 <br /> Nickel 1.0 <br /> 1.0 10.4 { <br /> 2. Compare the result of the waste extraction test (soluble value) to the values listed below in Table 2. If the <br /> soluble value equals or exceeds the designated soluble level for that metal further assessment is required. <br /> TABLE 2 <br /> DESIGNATED SOLUBLE LEVELS <br /> DEPTH TO WATER <5' ALL OTHER DEPTH TO WATER >3V 1 <br /> METAL POROUS SOIL SITES 5% OR> CLAY CONTENT ; <br /> Lead 0.015 0.15 1.5 <br /> Cadmium 0.005 0.005 0.5 <br /> Chromium 0.05 0.05 0.5 <br /> Zinc 2.0 20.0 200.0 <br /> Nickel 0.10 0.10 1.00 <br /> *a. The extraction solution to be used in the waste extraction test for most sites should be deionized water. If the <br /> site is (or may be) subject to acidic conditions, citric acid extraction solution should be used. The,.pH of the <br /> sail can be determined in the lab for those sites where acidic conditions are suspected but not known. <br /> The detection limits used in determining the soluble fraction of the metal should be low enough to compare <br /> with current water quality standards (not the STLC values). I <br /> 3/20/92 { <br /> i <br /> i <br /> .w <br />