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Corporate Office <br />' 3500 American River Drive <br /> P.O. Box 15002 <br /> Sacramento, Calif.95851 <br /> (916)484-3011 <br /> A.TEICHERT & SON, INC. <br /> e� Established 1887 <br /> Letter Of Acknowledgement <br /> A. Teichert & Son, Inc (Teichert) is in agreement with EMCON's recommendations <br /> regarding the attached workplan for 103 North E Street at Stockton. We believe the <br /> report is accurate and that all Tri Regional Board Guidelines have been followed. <br /> Since 1986, Teichert has expended a tremendous amount of resources to clean up the <br /> site at 103 North E Street. In 1987, Teichert launched a huge excavation which removed <br /> the majority of the contamination. Since that time, we have installed more monitoring <br /> wells which have shown that their is virtually no contamination remaining. Out of 14 <br /> samples of 3 monitoring wells, 11 samples showed benzene at non-detect levels. There <br /> has only been three samples which show very low levels of benzene. The three samples <br /> show benzene on the order of 1 to 1.7 ppb. In our opinion, reduction of these levels <br /> down to .5 ppb does not seem reasonable or justifiable. Since there are no nearby wells <br /> used for drinking water, we do not feel that 1.7 ppb poses any threat to the public. <br /> Furthermore over a period of time, these very low levels of benzene will decompose even <br /> further. <br /> Al Mer46rDate <br /> Vice P Vsident Mobile Equipment Division <br /> 3 - <br /> George zPakemori Date <br /> Equipment Administrator <br />