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V <br /> • • BP OI! ' ^" n BP Oil Company <br /> t f t±l 5 Environmental Remediation Managemen! <br /> 295 SW 41st Street <br /> Renton,Washington 98055.4931 <br /> (206)251-0667 <br /> March 6, 1997 Fax No:(206)2511.0736 <br /> San Joachin County Public Health Services <br /> Environmental Health Division <br /> Attention Mr. Steve Sasson <br /> P.O. Box 2009 <br /> 1601 East Hazelton Avenue <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 /> l <br /> This letter transmits a report titled Groundwater Monitoring and Sampling Report, dated 15 <br /> January 1997 and responds to a letter from the`San Joaquin County Public Health Services <br /> date stamped 7 February 1997. <br /> The enclosed report summarizes groundwater monitoring data collecte&since 1992. Upon <br /> review of the results associated with the most recent(l I November 1996) sampling event, <br /> you will note that petroleum hydrocarbons were detected in samples collected from four of <br /> the seven wells installed at this site. Consistent with the previous sampling events, the <br /> highest concentrations were detected in samples obtained from wells MW-1 and MW-2, <br /> located next to the underground storage tanks. <br /> The San Joaquin County 7 February 1997 letter raised a number of concerns, which I will <br /> address as follows: <br /> f <br /> 1. Enclosed please find the soil boring and well completion diagrams for all of the wells at <br /> the site. My records show that logs for wells MW-5 through MW-71 were submitted,,to <br /> Mr. Mark Collins of San Joaquin County Public Health Services o28 September 994. <br /> The logs were appended to Alisto Engineering Group's Supplemental Site Investi ation <br /> Report, dated June, 1994. Let me know if you need another copy of the report and I will <br /> send it to you. <br />{ 2. Your letter suggested that benzene and MTBE concentrations are rising in wells MW-1, <br /> MW-2, and MW-5, and that annual sampling of wells MW-3, MW-4; and MW-5 may <br /> result in missing the migration of MTBE in an upgradient direction.;,You will recall that <br /> the highest benzene concentrations at this site have been detected in"samples obtained <br /> s <br />