Laserfiche WebLink
i <br /> The corrected and updated Iso-concentration lines indicate a mass remaining of TPHg of 0 38K <br /> ( 51L), Benzene 0 005Kg ( 005L), and 1,2-DCA 0 035Kg (0 028L) <br /> CONCLUSIONS <br /> The deep sand layer at 70' below ground surface appears to be 15' thick <br /> BTEX, fuel Oxygenates, 1,2-Dichloroethane, and EDB were non-detect indicating that the j <br /> boundaries of the leak from the stoddard solvent tank and the leaded gasoline tank have been <br /> identified There were detectable amounts of Tetrachloroethene (PERC) in CPT#2 at 75' The <br /> 5 6ppb of Tetrachloroethene found is only 0 6ppb over California Primary MCLs of 5ppb The test <br /> results for Tetrachloroethene for the monitoring wells within the Vogue Cleaners property are non- <br /> detect or less than Ippb The offsite monitoring well MW-5D shows 1 6ppb Tetrachloroethene <br /> The data is showing the highest concentration of Tetrachloroethene and 1-2 DCA to be offsite <br /> The presence of TetrachIoroethene (PERC) in CPT #2 at 75' below ground surface was an <br /> unexpected finding The equipment used at Vogue Cleaners was not designed to accommodate <br /> PERC in the dry cleaning process PERC was never stored in the stoddard solvent tank nor in the <br /> gasoline tank The presence of PERC is not attributed to the Vogue Cleaners site <br /> I <br /> RECOMMENDATIONS <br /> Foothill Engineering recommends that the information from CPT#1 and#2 be combined with the <br /> up coming new monitoring wells MW-I S&D, and MW-6S&D on the Site Conceptual Model and <br /> the updated Site Conceptual Model be submitted for SJCEHD's reconsideration of site closure <br />• In order to conserve financial resources biannual monitoring was cancelled for the third quarter of <br /> 2005 in favor of the additional exploratory work Biannual monitoring will resume with the first <br /> quarter of 2006 <br /> Please contact this office at (916) 729-5184 if any questions arse from this report <br /> Respectfully submitted, Q�oFEss� <br /> Foothill Engineering �`�p �,tflBL��r cry <br /> sCO <br /> z <br /> � <br /> 0 U rn <br /> C 577^L-7 <br /> 1EXP 12-31-07 - Zh <br /> / <br /> Michael Vlach, PE <br /> Enclosures CPT Logs, Rev stdso-concentrations, Summary Recap of Analytical Data, Lab <br /> Certified Data, and Revised Fence Model (2406) <br /> cc Mrs Helen Higgins, 5815 Morgan Place#16, Stockton CA 95219 <br />• <br /> 3 <br />