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r� n <br /> BP OIL BP Oil Company <br /> Environmental Remediation Management <br /> 295 SW 41st Street <br /> Renton,Washington 98055.4931 <br /> (425)251-0667 <br /> Fax No:(425)251-0736 <br /> Transmitted by overnight courier <br /> May 22, 1998 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Attention Mr.M. Infurna,Jr., Senior REHS <br /> 304 E. Weber Ave.,Third Floor cR^Fs° <br /> P.O.Box 388 <br /> Stockton,CA 95201-0388 <br /> M1 AY 2 6 1998 <br /> RE: Former BP Oil Site No. 11195 HEALTH <br /> 1-5 &Louise, SEQ <br /> 16500 S.1-5 SERVICES <br /> Lathrop,CA <br /> Site Code:1554 <br /> Dear Mr. Infurna: <br /> This letter transmits the 18 May 1998 Work Plan for Supplemental Site Investigation prepared on behalf <br /> of BP by Alisto Engineering Group. I believe this addresses all of the concerns discussed during our <br /> meeting at the site on 7 May as well as our subsequent afternoon meeting with others at your Stockton <br /> offices. <br /> I believe some explanation is in order regarding the hydraulic conductivity testing performed at the site on <br /> the morning of 7 May. Upon rechecking field calculations,we find that the horizontal flow velocity is <br /> considerably less than we initially believed. Given verified flow rate calculations on the order of up to a <br /> few feet per year rather than tens of feet per year, I think you will agree that this is good news. To my <br /> mind,this development reinforces the need to carefully evaluate man-made subsurface pathways,as these <br /> pathways will likely play a major role in both complicating the natural pathway interpretation and <br /> providing highly permeable conduits for the migration of the release. You will recall that we spent some <br /> time identifying these pathways in the field on 7 May. <br /> Feel free to call me at(425)251-0689 if you have questions. <br /> Sincerely, <br /> colt Hooton � <br /> attachment <br /> cc: site file <br /> B.Nagle-Alisto <br /> J.R.Rocco <br /> C.R.Pinzone <br /> i <br /> David Camille -Tosco(w/attachment) <br /> CRWQCB-CVR,Attention Ms.Beth Thayer,3443 Routier Road, Sacramento,CA 94827-3098 <br /> i <br /> I <br /> I. <br />