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Frorh:Staff To: Erin Garner • Dale:119196 Time: 11:41:44 Page 6 of 11 <br /> Subject: Supplemental Instructions to State Water Board December 3, 1995, <br /> Interim Guidance on Required Cleanup at Low Risk Fuel Sites <br /> January 5, 1996 / Page 3 <br /> In addition to the various methods of contaminant transport described in the ASTM standard, other <br /> methods may also be acceptable in determining heafth and environmental protective levels. <br /> When using the ASTM lookup table risk based screening levels (RBSLs) one has to multiply the RBSL <br /> value for benzene by a factor of 0.29 to obtain the corrected value for California (CAL EPA has a higher <br /> toxicity value of 0.1 as compared to the 11SEPA value of 0.029 for benzene). All other values in the table <br /> remain the same. <br /> 6) The site presents no significant risk to the environment. <br /> RBCA has no specific guidance for evaluating environmental risk although the basic framework is <br /> appropriate it site specific exposure pathways and ecological receptors are included. If the silo has a <br /> potential to significantly impact surface water, wetlands, other sensitive receptors, rt should not be <br /> considered low risk. <br /> Management Strategy <br /> Low risk soils cases should be closed when it is determined that site conditions conform to the above <br /> criteria. Further remediation or monitoring is not required. It the highest permitted use (e.g., residential) is <br /> not protected by the chosen cleanup levels, then land use restrictions or notifications for the site may be <br /> appropriate. <br />