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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY r� •oG Unit Stipervisot•S Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. r'. { Director Mike Fluggins,R.E.H.S., R.D.I. y' �J Allsen,R.1 . .s. Stockton, California 9520?_.-27OS . _�----�:• Douglas W.Wilson,R.E.H.S. 1� Prtrgram A9nraagcr Telephone: (209) 468-3420 Marga€'et 1 agorio,R.E.H.S. 44i Laurie A.Cotulla,R.E.M.S. Robert McClellon,R.E.H.S. Prop-am Manager Fax: (209) 464-01.38 Mark Barcellos,R.E.H.S. JOSEPH ROKOSZEWSKI FED 15 2005 R & L DIESEL SERVICE INC 2015 W HARDING WAY STOCKTON CA 95203 RE: R & L Diesel Service 2417 West Lane Stockton, CA San Joaquin County Environmental Health Department (EHD) has reviewed the work plan prepared by Environeering, Inc. dated January 28, 2005, to investigate the above referenced site. The work plan discusses investigation of two different areas at the site. One area is in front of a Parts Building where it is possible that two underground storage tanks (UST's) were operated prior to R & L Diesel purchasing the property. The work Plan states that if there is evidence of the tanks that soil samples will be taken adjacent to the tanks and that the tanks will be closed in place or removed. Please be advised that if UST's are found that were not properly closed (filled with inert material), they must be removed under permit and inspection of the EHD tank compliance unit. If the UST's were properly closed and you want EHD to provide a letter that states further investigation of the UST's is not required, then the same type of investigation of this area is required as is required for the closed in place waste oil UST except sample analysis would be for unknown contents of the UST's. The analysis performed would include total petroleum hydrocarbons (TPH) as gasoline and diesel; benzene, toluene, ethyl- benzene, xylene (BTEX); total lead, methyl tent butyl ether (MTBE), tert butyl alcohol (TBA), diisopropyl ether (DIPE), ethyl tent butyl ether (EtBE) tertiary amyl methyl (TAME) using appropriate EPA Methods. The second area of investigation is beneath the waste oil UST that was closed in place in April 1988. EHD does not agree with the proposed investigation and provides the following comments and concerns. 5 In correspondence from you to EHD dated January 14, 1987, you stated "we had Integrity Tank Testing perform a test on the tank, but upon filling the tank we found that it leaked at the top portion so we could not perform a complete test". Therefore, it is possible that there was an unauthorized release from this UST and that soil contamination may exist near the top of the UST as well as beneath the UST so soil samples should be collected and analyzed from near the top of the UST as well as from beneath the UST.