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Mr. J. Kelly Williamson IT CORPORATION <br /> Kayo Oil Company <br /> March 14, 1985 <br /> Page 2 <br /> MW-3, accompanied by a 20 percent LEL reading in vapors coming up the <br /> auger stem, was the only other record of hydrocarbons in the three <br /> wells. The soil profile in all three bores was predominantly silty sand <br /> with occasional lenses of sandy silt, silty clay, or sand. <br /> Conclusions and Recommendations <br /> The presence of hydrocarbons Ott the water table in MW-1 indicates that <br /> there has been a spillage or leakage in the vicinity of the tanks which <br /> has reached the water table and spread laterally. We recommend that the <br /> local agencies and the Regional Water Quality Control Board be notified <br /> of the presence of hydrocarbon in the s il . The tank and piping records <br /> should be checked to' determine if a leak is present or if spillage is <br /> the likely cause of the hydrocarbons. W-1 should be monitored for the <br /> accumulation of gasoline, and vapors monitoring should be conducted in <br /> the other two wells. It appears that t ree to five monitoring wells to <br /> the water table will be required to define the water table surface and <br /> determine the extent of the contamination under the site. <br /> We trust the information contained herein meets your needs at this time. <br /> If you have any questions concerning this work, please feel free to <br /> contact me at our Martinez, California, office (415) 228-8400. <br /> Yer truly yours, <br /> Robert M. Galbraith, R.G. 3881 <br /> Manager, Geotechnical Services <br /> RMG:fc <br /> Attachments <br />