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.......... Other regions use different atnndardn for determining when a groundwater Inventigatinn will be required. For mxnmple benzene In often twed in lieu or TPN. Fvett very low iovew or benzene urn often seen an grounda for requiring a subsurface investigatlaii, This criteria may be relaxed or stiffened depending an the Icy--atfon of the mitt- In relation to different groundwater syntnmn, the depth to wnter, type of "oil, and the coocentrationn of benzene Involved, The above standards apply only to fuels. When snmples taken In connection with a waste oil tank or a solvent tank are found to contain even small amounts of any of the EPA priority pollutants (such no 'rCE, PCE, DCE etc. which are detected by EPA methods 8010, 8020, and 8240) more stringent standards are often ap-.lied. In these cation, 5011 borings and monitoring well installation may b; i squired it there Is any detectable amount of any of the EPA priority pollutant compounds. When contaminants are found to havo reached the water underlying a site, the Br+nrd customarily requires that additional work be undertaken in order to define the extent or the contamination. REPORTAGE Submission to the Regional Water Quality Control Board and the local 0111111 implementing agency should include copies of the sampling report, the chain of custody, and the certified analytical report issued by the Hazardous Materials Testing Laboratory. The property owner should attach a cover letter and submit all documents together in a package. The following addresses have been listed here for your convonlenca: Water Quality Control Board Central Valley Region 3201 South Street Sacramento, CA 95816 ATTN: Antonin Vorster Son Joaquin Local Health Department Environmental Health Division 1601 East Hazelton Avenue Stockton, CA 95201 ATTN: William Snavely SnAopling Report 88342-C-I ClIsvno,4 1910 S1aCT1O14 PIVL/paga 12