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s31��` • <br /> SECOR www secorcom <br /> INTERNATIONAL 3017 Kilgore Road Suite 100 <br /> S E C ® R INCORPORATED Rancho Cordova CA 95670 <br /> 91$-881-0400 TEL <br /> 91661-0430 FAX <br /> kyt <br /> r,7 VED <br /> December 30, 2003 ` <br /> Mr Michael Infurna � �� (' l 2004 <br /> San Joaquin County Environmental Health DepartnLt�� <br /> Environmental Health Division EN\j H <br /> 304 East Webber Avenue, Third Flopi�Kjljft tl0,iWICES <br /> Stockton, CA 95202 41Z <br /> / G-c <br /> Re Response to San Joaquin County Environmental Health Department <br /> Circle K Store 01205 <br /> 16470 Cambridge Street, Lathrop, California <br /> SECOR Project No 77CP 61205 06 00010 <br /> Dear Mr Infurna <br /> This letter, prepared by SECOR International Incorporated (SECOR) on behalf of ConocoPhillips, <br /> presents the response to correspondence between Mr Mike Infurna with San Joaquin County and Ed <br /> Ralston with ConocoPhilllps (e-mail November 5, 2003) and Clinton Harms with SECOR International <br /> (phone conversation November 5, 2003) regarding Addendum to Work Plan for Off-Site Assessment <br /> dated April 7, 2003 During the above mentioned correspondence Mr Mike Infurna addressed the <br /> two following concerns 1) performing additional lateral assessment based on only one sampling <br /> event conducted at well MW-16 may not be appropriate and 2) the need for vertical assessment of <br /> the dissolved groundwater plume both on and off-site <br /> Performance of Lateral Assessment <br /> The fourth quarter groundwater sampling event performed at the site was conducted on October 9, <br /> 2003 (Analytical data is Included In Attachment A and will follow in a quarterly monitoring report <br /> prepared by TRC Alton Geosclences) The following are the results and a comparison with 3`d r <br /> quarter 2003 data for the down gradient wells Well MW-16 was Initially developed and sampled on <br /> September 15, 2003 after Installation <br /> 3r Quarter 2003 4 Quarter 2003 <br /> Well TPHg MTBE TPHg MtBE Comments r <br /> MW-12 7,600 880 16,000 540 Increase In TPH /decrease In MtBE y <br /> MW-13 <50 <2 0 <50 <2 0 Same <br /> MW-14 <50 66 <50 23 Decrease in MtBE now below MCL ; <br /> MW-16 52 140 1 <100 180 SII ht Increase in MtBE <br /> All concentrations in parts per billion (ppb) <br /> SECOR would request that SJC EHD approve the Addendum to Work Plan for Off-Site Assessment <br /> dated April 7, 2003 based on the above data SECOR anticipates that the work will be completed <br /> during the first quarter after encroachment permits and access agreements are completed <br /> Performance of Vertical Assessment <br /> ConocoPhilllps would like to complete the vertical assessment requested at the site during a future <br /> scope of work, not the currently proposed work outlined In Addendum to Work Plan for Off-Site <br />