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IOEMORANDUM , CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD ' CENTRAL VALLEY AL 9Es)REGIO 3443 Router Road, Suite A CALNEi: 8-494-3000 Sacramento, California 95827-3098 Fnm: Jon B. Marshack To: Technical Staff Senior Environmental Specialist Fresno, Redding and Envircrtmental(Technical Support Unit Sacramento Offices DATE: 17 May 1995 SIGNATURE: (updates and replaces memoranda dated 3/26/90, 1/14/91,7/6/92, 5/13/93, and 1/18/95) _PROTECTIVE WATER SUBJECT: BEOIMPONEN SOF PETROLEUM-BASED FLEZST EMITS FOR ased A significant amount of our work involves the spills into soil and water. various water quality�eiei[eria have been cited by stiption of taff b all in determining rmitting e1 In an effort to whether beneficial uses have been impaired lr ylimits fo by P rposeeand to ring to your uniformity in the use of numerical water quality attention the wide range of available and relevant criteria I offer the list on the back of this memorandum. These values come from the staff report A Compilation of Water Quality Goals, ende to be May 1993 edition, updated with more recent information. These limitser.t Sou r es of drinking applicable to the protection of existing or potential sources of drinking water are surface and ground waters which have the beneficialCu ntrol plan e of c(Basin Pipal and ltan ) or the supply (`vlLN, as designated in the applicable Water Quality Resolution No. 88-63. State Water Board's "Sources of Drinking Several of the recommended values are based on the taste and odor which these chemicals can impart to water. For these chemicals, impacts on the palatability of the water occurs at lower concentrations than those which cause health effects. Taste- and odor-related criteria are applicable, since both health effects and palatability are relevant to the assessment of beneficial use protection. specifically,und or surface wa waans ters that havetheter�i' beneficialluseprohibiting designation.adverse tastes or odors in ground you will notice that certain of the recommended limits are lower than applicable analytical detection of any amount of these constituents in water detection limits in water. In these cases, the indicates that beneficial uses have been impaired. In addition, an assessment of existing and potential water quality impacts must take into account y With Respect to Maintaining High State Water Board Resolution Nos. 68-16 Quality of Waters in California, and 92-49, Policies and Procedures for Investigation to d Cleanup , Statement of Policy and Abatement of Discharges Under Water Code Section 13304- Requiring P technologically and economically achievable levels which are lower than beneficial use-protective limits, would be consistent with these policies for water quality control. J51