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x�# DEPARTMENT OF THE NAVY NAVAL COMMUNICATION STATION STOCKTON STOCKTON,CALIFORNIA 95203-5000 IN REPLY REFER TO 5090 Ser 33/ 2 0 OCT1989 San Joaquin County 0 CT 2 3 1983 Public Health Services � 'MENTA`' Er'H "LTH Attn: Ms. Laurie Cotulla EN.. :RGN P. 0. Box 2009 FER!V!T/SER',,'I SES Stockton, CA 95201 Dear Ms. Cotulla: Naval Communication Station Stockton is conducting a Remedial Investigation/ Feasibility Study (RI/FS) per the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) , as amended by the Superfund Amendments Reauthorization Act of 1986, and other applicable federal and state laws and regulations . Section 121 (d) (2) (A) of CERCLA incorporates into law the CERCLA Compliance Policy, which specifies that remedial actions are to meet any federal standards , requirements , criteria, or limitations that are determined to be legally applicable or relevant and appropriate requirements (ARARs) . Also included is the new provision that state ARARs must be met if they are more stringent than federal requirements . Federal statutes that are specifically cited in CERCLA include the Solid Waste Disposal Act, Toxic Substances Control Act, Safe Drinking Water Act, Clean Air Act, Clean Water Act, and Marine Protection Research and Sanctuaries Act. States are required by CERCLA to identify state ARARs ' in a timely manner' , that is , in sufficient time to avoid inordinate delay or duplication of effort in the remedial process. There are three general categories of ARARs : chemical- , location- , and action- specific. Chemical-specific ARARs set health or risk-based concentration limits or ranges in various environmental media for specific hazardous substance, pollutants , or contaminants. Location-specific ARARs set restrictions on activities depending on the characteristics of a site or its immediate environments. Action-specific ARARs set controls or restrictions on particular kinds of activities related to management of hazardous substances , pollutants , or contaminants . ARARs can be identified only on a site-specific basis. They depend on the specific chemicals at a site , the particular action proposed as a remedy and the site characteristics. The different ARARs that may apply to a site and its remedial action should be identified and considered at multiple points in the remedial planning process. The chemical-specific and location-specific ARARs may be identified on a preliminary basis during the scoping of the RI/FS. During the site character- ization phase of the RI , when the public health evaluation is conducted to assess risks at a site, the chemical-specific ARARs and advisories and location- specific ARARs are to be identified more comprehensively and used to help deter- mine the cleanup goals. During development of remedial alternatives in the