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h -T <br /> ` <br /> 7U. to U.( an15—u d(1STUN, (I'.KAS 7ldlfl-4415 ;5 i!q� J rl i.r.q",9 <br /> 14ANNI TINL NI: EN <br /> PA Ii r HT <br /> It I;At r 9 r A TL A L'NGINLLpING <br /> I.N V I It U N H L N T A L INGINI:I R IN(i <br /> D. A. HARRIS <br /> LNV i It o MCN TAL GEOLOGI <br /> November 8, 1990 <br /> Former Exxon R/S i€: 7-3942 <br /> 4444 North Pershing Avenue <br /> Stockton, California <br /> Ms. Laurie A. Cotulla <br /> San Joanquin County Public Healthy Services <br /> Environmental Health <br /> 1601 East Hazelton Avenue <br /> Stockton, California 45201 <br /> Dear Ms. Cotulla: <br /> Attached for your review is a combined work plan to remediate soil and <br /> groundwater at the above referenced site. Details for the pump and treat <br /> system and for the soil vapor extraction system are included in this report. <br /> In the interest of restoring environmental quality in an expedient manner, we <br /> would like to proceed with implementation as quickly as possible. <br /> There is another pertinent Item that needs to be addressed. It is that data <br /> from wells installed to monitor this site strongly suggest that an upgradient <br /> source may be contributing hydrocarbons to the Exxon site. On page two of <br /> Table one the data confirming this is very clearly presented. Monitor wells <br /> 1-7 are all ,.on-detect for the presence of hydrocarbons in soil . MW-1 , MW-7, <br /> and MW-4 also lie along the border of Exxon's site as can be seen in Figure <br /> 3. However, quite conspicuously, soil analyses for MW-8, which lies <br /> upgradient of the Exxon site, reveal concentration levels of 12 ppm benzene, <br /> 150 ppm toluene, 260 ppm xylenes, and 3200 ppm TPN (near saturation level). <br /> Would you please respond to me as to how you plan to address the problem of an <br /> offsite contribution to this site? While our work plan is designed to try to <br /> deal with this problem, I also feel that the problem nees to be addressed at <br /> agency level . <br /> If you have questions, you may contact me at (713) 656-7755. <br /> Sincerely, <br /> DAH:t l g � .L�` L <br /> 3215D/l <br /> Attachment <br /> c - w/attachment: <br /> Mr. T. Peltier - Central Valley RWQCB <br /> ,i w/o attachment: <br /> Mr. D. J. Bertoch <br /> Mr. P. J. Brininstool <br /> Mr. Terry Winsor - EA Engineering, Lafayette office. <br />