SITE INFORMATION AND CORRESPONDENCE_FILE 1

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Excerpts on Ground Waters and Site Cleanup Page 2 from the Water Quality Control Plan CHAPTER II. EXISTING AND POTENTIAL BENEFICIAL USES Ground Waters Beneficial uses of ground waters of the basins are presented below. For the purposes of assigning beneficial uses,the term ground water is defined in Chapter I. Unless otherwise designated by the Regional Water Board, all ground waters in the Region are considered as suitable or potentially suitable, at a minimum, for municipal and domestic water supply (MUN), agricultural supply (AGR), industrial service supply (IND), and industrial process supply (PRO). In maktng any exceptions to the beneficial use designation of municipal and domestic supply (MUN', the Regional Water Board will apply the criteria in State Water Board Resolution No. 88-63, 'Sources of Drinking Water Policy'. The criteria for exceptions are: • "The total dissolved solids (TDS) exceed 3,000 mg/1 (5,000µmhos/cm, electrical conductivity) anc it is not reasonably expected by the Regional Water Board [for the ground water] to supply a public water system, or • "There is contamination, either by natural processes or by human activity (unrelated to a specific pollution incident), that cannot reasonably be treated for domestic use using either Best Management Practices or best economically achievable treatment practices,or • "The water source does not provide sufficient water to supply a single well capable of producing an average, sustained yield of 200 gallons per day, or • "The aquifer is regulated as a geothermal energy producing source or has been exempted adrainistratively pursuant to 40 CFR, Section 146.4 for the purpose of underground injection of fluids associated with the production of hydrocarbon or geothermal energy, provided that the ie fluids do not constitute a hazardous waste under 40 CFR Section 261.3." To be consistent with State Water Board Resolution No. 88-63 in making exceptions to beneficial use designations other than municipal and domestic supply (MUN), the Regional Water Board will consider criteria for exceptions, parallel to Resolution No. 88-63 exception criteria, which would indican;limitations on those other beneficial uses as follows: In making any exceptions to the beneficial use designation of agricultural supply (AGR), the Regional Water Board will consider the following criteria: • Tho-re is pollution,either by natural processes or by human activity (unrelated to a specific pollution incident), that cannot reasonably be treated for agricultural use using either Best Management Practices or best economically achievable treatment practices,or