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WEST & HANSEN ENGINEERS, INC. <br /> P. O. Box 5891, Vacaville, California 95696 • (707) 451-1360 <br /> H <br /> June 3, 1991 ,�'�'�' � <br /> �WN <br /> San Joaquin County, Public Health Services GN ti ALHEPL�µ <br /> Po Box 2009 EN`,R�NN1 \CEs <br /> Environmental Health Division ptF'CM�1� <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> Attn: Letitia Resch REHS <br /> Subject: Closure In Place Proposal; Underground Boiler Fuel Tank - <br /> Stockton Developmental Center - Addendum <br /> Dear Ms . Resch, <br /> This letter and accompanying laboratory reports constitute an <br /> addendum to our report of findings dated May 21 , 1991 regarding the <br /> above referenced site. Although our chain of custody form <br /> (included in our report of May 21 ) specified soil sample analysis <br /> by EPA method 8270, appropriate for the heavy fuel oil stored at <br /> this tank site, our laboratory inadvertently performed an EPA 8260 <br /> analysis, appropriate for lighter molecular weight hydrocarbons . <br /> As indicated on the enclosed laboratory report forms, analysis by <br /> EPA 8270 indicates a TPH concentration of 3200 PPM in sample B1-1 . <br /> This is in addition to the 700 PPM detected utilizing EPA 8260, <br /> resulting in a total TPH concentration approaching 4, 000 PPM. All <br /> three other samples were non-detectable based on both test methods . <br /> We believe our original conclusion regarding contaminant extent is <br /> still valid; ie based on the non-detect results of soil samples <br /> B1-2, B2-1 and B2-2 the vertical and lateral extent of <br /> contamination is limited. <br /> Similarly, our other conclusions regarding the potential threat to <br /> groundwater, contaminants encountered, property ownership and <br /> practicality of remediation are unchanged. Only the magnitude of <br /> TPH contamination in one sample is modified by this addendum. <br /> We look forward to receiving notification from your office <br /> regarding our application to abandon this tank in-place. For any <br /> additional information please contact me at (707) 451-1360 . <br /> Yours truly, <br /> Brian W. West PE <br /> West & Hansen Engineers, Inc. <br /> cc: Cody Begley, OSA <br />