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i <br /> kJ <br /> t t a <br /> �-rr''f,k; '� i s <br /> .:��•Etr�s ;.im. <br /> e <br /> pr-6,6 4 - :ter` ;'_, <br /> ; i#gini�, BP oil Company <br /> Environmental Resources Managetnent <br /> Bp OIL (+EP _�j (� er�i r� wilding 13.suite N <br /> f �} 8 f 1 1 G J K5 SW 41st Street <br /> Renton.Washington 9B055-4931 <br /> i (206)251-0667 <br /> ' September 5, 1995 <br /> San Joachin County Public Health Services <br /> Environmental Health Divisions <br /> Attention Mr- Steve Sasson <br /> l P.O. Box 2009 <br /> 1601 East HazeltoirAvenue <br /> Stockton, CA 95201 <br /> RE: BP Oil Site No. 11193 .{ <br /> Hammer&Kelly <br /> Stockton, CA,.- - , <br /> SITE CODE` 1129 <br /> ## Dear Mr. Sasson: <br /> This letter transmits a report titled Groundwater.Monitoring and SamplingRepo rt, dated <br /> `August-10, 1995,.. This letter also follows-up and confirms our telephone conversation <br /> that took place on July 6, 1995. <br /> Upon review of the report,-you will note that petroleum hydrocarbons,were detected in six <br /> of the monitoring wells,with the highest benzene concentrations(360 ug/1) reported in <br /> well MW-2. Plans for the upcoming quarter Include continuing groundwater monitoring. ' <br /> Confirming our July 6, 1995 telephone conversation, I understand that the extent of the <br /> petroleum hydrocarbon release has been adequately defined. I also understand that the <br /> used-oil UST area warrants a"no further action" priority, were it not for the suspected <br /> presence of MTBE (a gasoline octane enhancer), previously reported by the analytical <br /> laboratory. <br /> Finally, you requested that I forward information regarding the fate and transport of the <br /> petroleum hydrocarbons detected in the groundwater at this site. To that end, I have <br /> attached a copy of a memorandum summarizing the affects of leaking underground fuel <br /> tanks upon water supply wells in Region 5 (Central Valley Regional Water Quality <br /> Control Board). I have also attached calculations for the solution to an analytical <br /> transport and fate model'.(By including.the calculations with the memorandum, I am <br /> attempting to show how this site"fits" into the broader context of all of the sites in the <br /> Central Valley, including those rare circumstances where the actual impairment of <br /> beneficial use of shallow groundwater has resulted from a UST release: <br /> f - _ <br /> ' L'1_V-29SE3-� <br />