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<br />. <br /> <br />will be permitted is open to question. <br /> <br />. <br /> <br />Problems Outside the Purview of PL 92-500 <br /> <br />Diffuse Runoff and Atmospheric Fallout. As already noted above, <br /> <br />PL 92-500 does not provide direct controls or remedial solutions for <br /> <br />. <br /> <br />~ <br /><::> <br />~ <br />~ <br /> <br />diffuse natural sources. It also appears that the atmospheric transmis- <br /> <br />!lion of pollutants, such as heavy metals, is not adequately covered by <br /> <br />. <br /> <br />the Act, although it is subject to federal and state regulation under the <br /> <br />Air Quality Act. <br /> <br />Discharge into Dry Washe!l, It is presently a matter of dispute <br /> <br />. <br /> <br />:whether the discharge of pollutants into dry washes is a discharge sub- <br /> <br /> <br />ject to the effluent limitations and permit procedures of PL 92-500. <br /> <br />Pending the outcome of industrial-source litigation on this issue, in- <br /> <br />. <br /> <br />dications are that the EPAis ,not preslling to place dry-wash discharges <br />of :return flows under. permit. 43 <br /> <br />. <br /> <br />Groundwater Pollution. TheCRB is underlain at numerous Ioca- <br /> <br />tions with groundwater. Although many of the aquifers remain undeveI- <br /> <br />oped and are not currently subject to pollution by injection or percolation, · <br /> <br />others are being degraded in quality. Although the EPA is authorized <br /> <br />generally under PL 92-500 to "prepare or develop comprehensive pro- <br /> <br />. <br /> <br />grams for preventing, reducing or eliminating the pollution of the nav- <br /> <br />igabIe waters and groundwaters and improving the sanitary condition of <br /> <br />surface and underground water!l, ,,44 the thrust of the act is toward sur- <br /> <br />. <br /> <br />face water quality. The water quality standards, effluent limitations <br /> <br />8 <br /> <br />. <br />