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NEST&HANSEN <br /> ENGINEERS.INC. <br /> 7. ANALYTICAL LABORATORY <br /> Our proposed analytical laboratory is Coast to Coast Laboratories, <br /> Inc. , 1885 Kelly. Road, Napa 94558. The Coast to Coast phone <br /> number is 707-257-7211 . Coast to Coast is certified by the <br /> California Department of Health Services (No. 108) for EPA methods <br /> 8020, 8260, 8270 and 8240, among others. Coast to Coast is also <br /> accredited for environmental testing by the American Association <br /> for Laboratory Accreditation. <br /> 8. ANALYTICAL METHODS <br /> It is proposed to analyze all soil samples for total petroleum <br /> hydrocarbons (TPH) , benzene, toluene, xylenes and ethyl benzenes <br /> (BTXE) . The most recent Tri-Regional Recommendations ( 10 August <br /> 1990) authorize two EPA test methods for soil analyses where <br /> fuel/heating oil is the potential contaminant (Page 17, Table #2 <br /> "Recommended Minimum Verification Analyses for Underground Tank <br /> leaks" ) . One method utilizes EPA 3550 (GC/FID) for TPH and EPA <br /> 8020 or 8240 for BTXE. The alternative is EPA 8260 (GC/MS) for <br /> both TPH and BTXE. <br /> It is proposed to utilize EPA 8260 for the soil sample analyses <br /> associated with this project. Not only does this method offer the <br /> advantage of lower detection limits, as compared with GC/FID, it is <br /> a more efficient procedure since both TPH and BTXE are measured in <br /> a one pass analyses. <br /> Enclosed also with this submittal is a dated "Authorization To <br /> Release" form and a copy of a letter received from the Stockton <br /> Fire Department regarding their jurisdiction in this matter. <br /> I trust the information in this addendum, in conjunction with the <br /> information submitted with our original closure in place <br /> application, will satisfy Environmental Health Division <br /> requirements for authorization to perform soils borings under this <br /> tank. We are anxious to investigate soil conditions in the tank <br /> vicinity so as to determine the probable closure method. If I can <br /> provide any additional information please contact me at (707)-451- <br /> 1360 . <br /> Yours truly, <br /> Brian W. West PE <br /> West & Hansen Engineers, Inc. <br /> BWW/es <br />