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,, „ Ms Vicki McCartney <br /> Page 2 of 3 <br /> IS <br /> levels, groundwater samples were collected using dedicated disposable bailers and transferred into <br /> appropriate containers The samples were stored in an ice-chest refrigerated to approximately 4°C, for <br /> subsequent transport to Argon Laboratories (ELAP #2359) under chain of custody protocol Field notes and <br /> purge logs are included in Attachment A <br /> GROUNDWATER ANALYTICAL RESULTS <br /> Argon Laboratories analyzed all groundwater samples for total petroleum hydrocarbons as gasoline (TPHg) <br /> using EPA method 8015B, for benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 802113, <br /> and for oxygenated gasoline additives, including the lead scavengers EDB and 1,2-DCA, using EPA method <br /> 8260B I / <br /> Wells MW1 and MW3 contained TPHg at 240 parts per billion (ppb) and 140 ppb, respectively Toluene <br /> was detected at very low levels in MW1 and MW3 at 0 8 ppb and 0 6 ppb, respectively Low levels of <br /> ethylbenzene and xylenes were detected in MW1, both at 1 8 ppb No TPHg or BTEX constituents were <br /> detected in well MW2 No benzene, oxygenated gasoline additives, or lead scavengers were detected in any <br /> site well Groundwater analytical results are summarized in Table 2 Laboratory reports are included in <br /> Attachment B Charts showing contaminant concentration trends are included in Attachment C <br /> SUMMARY AND CONCLUSIONS <br /> • The depth to groundwater beneath the site ranged from 1151 to 12 02 feet btoc Groundwater flowed <br /> north with a gradient of approximately 26 feet per mile <br /> • TPHg was detected in wells MW 1 and MW3 at 240 ppb and 140 ppb, respectively <br /> • No benzene or gasoline additives were detected in any site well No BTEX constituents were present in <br /> any site well at levels exceeding their respective primary Maximum Contaminant Levels (MCLS) <br /> Please feel free to contact Ground Zero at (209) 838-9888 if you have any questions regarding this <br /> submittal <br /> Eta <br /> Respectfully, <br /> Ground Zero Analysis,Inc tL <br /> JLAN A <br /> ANE <br /> John P Lane No 6795 <br /> CA Registered Geologist No 6795 <br /> Attachments OF CAL��O <br /> cc Mr James L L Barton, RWQCB <br /> Ms Karen Collins, Environmental Closures <br /> Mr Patrick D Riddle, Attorney-at-Law <br /> Mr Mike Souza, Souza H,LLC <br /> G 1GROUNDZE\Souza\Reportsl4QMR_2003 doe <br />