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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-DCA 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 work 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 /> depth/constituent 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 DISAPPROVAL OF THE WORK PLAN fH&S 25296.10(c)(3)1: <br /> • none <br /> DATED: August 23, 2004. by: <br /> Michael Infurna, Se ' r REHS (209) 468-3454 <br /> [ X ]Faxed to Secor Intl on: 8-23-04. <br />