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L)tj/13/'eE7114 UU .fib 2094683433 FIFTH FLOOR PAGE 03 <br /> Z <br /> 7-Eleven #14117 -page 2 <br /> 2725 Country Club Blvd , Stockton <br /> COMMENTS AND CONDITIONS (continued) <br /> • Currently no 1,2-DCA soil data exists for this site. 1,2-LOCA analysis <br /> is required and is to be added to soil sampling protocol during this <br /> phase. Ensure adequate numbers of soil samples are collected and <br /> analyzed for 1,2-DCA throughout the site, and offsite as needed. <br /> • Existing monitoring wells for this site, as well as previously collected <br /> ground water grab samples, have only investigated to a maximum <br /> depth of 52' bgs, with all but one monitoring well, screened to only <br /> 20-feet bgs. TBA and other contaminants are present at these <br /> depths and the proposal to collect ground water grab samples from <br /> the CPT borings "near 70, 90, 110 feet bgs"may not be adequate to <br /> delineate the constituents of concern (data 52' to 70' ?) Ensure an <br /> adequate number of ground water samples are collected and <br /> analyzed from ALL permeable zones noted in the electronic CPT <br /> boring for all the constituents listed in the worts plan. Contaminants <br /> detected in these zones may require discrete monitoring well- <br /> screened intervals in the future as well as additional lateral and/or <br /> vertical investigation <br /> The report of findings for this phase should be formatted in the <br /> context of, and added to, the Site Conceptual Model (SCM) as an <br /> update Separate iso-concentration maps for each constituent <br /> detected on and offsite should be included in the SCM Separate <br /> depthleonstituent iso-concentration maps may also be needed if <br /> significant impact by each is noted in any permeable zone. Areas <br /> where lateral and vertical extents of contaminants are not supported <br /> by soil and ground water data will require additional investigation. <br /> Provide private party and City of Stockton encroachment permit <br /> copies to SJCEHD along with Well Permit Application forms and <br /> fees <br /> REASONS FOR DISAPPROV OF THE WQRK PLAN H&S 25296.10 c 3 <br /> ® none <br /> DATED Au ust . <br /> 23 2004 4 "►' � <br /> 9 y <br /> Michael Infurna, Sew&REHS (209)468-3454 <br /> [X]Faxed to Secor Intl on 8-23-04 <br />