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m <br /> Ms Vicki McCartney <br /> Page 2 of 3 <br /> • After groundwater parameters had stabilized and water levels had recovered to at least 80% of pre-purged <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 8021B, <br /> and for oxygenated gasoline additives, including the lead scavengers EDB and 1,2-DCA, using EPA method <br /> 8260B <br /> Wells MW1 and MW3 contained TPHg at 700 parts per billion (ppb) and 340 ppb, respectively Benzene <br /> was detected only in well MW3, at 0 9 ppb Well MW3 also contained very low levels of toluene and <br /> ethylbenzene Very low levels of toluene, ethylbenzene, and xylenes were also detected in well MW1 No <br /> BTEX constituents were detected in well MW2 No oxygenated gasoline additives were detected in any site <br /> 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 12 26 to 12 77 feet btoc Groundwater flowed <br /> north with a gradient of approximately 25 feet per mile <br /> • TPHg was detected in wells MW1 and MW3 at 700 ppb and 340 ppb, respectively <br /> • Benzene was detected only in well MW3, at 0 9 ppb No BTEX constituents were present in any site <br /> well at levels exceeding their respective primary Maximum Contaminant Levels (MCLS) <br /> • No oxygenated gasoline additives were detected in any site well <br /> Please feel free to contact Ground Zero at (209) 838-9888 if you have any questions regarding this <br /> submittal <br /> '��R�D GFpI <br /> Respectfully, �� 4 <br /> GroundZero Analysis,Inc � JONN P �N► <br /> LAV <br /> filo 6795 <br /> John P Lane <br /> CA Registered Geologist No 6795 <br /> O� C <br /> Attachments <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 II,LLC <br /> 0 IGROUNDZE\Souza\Reportsl3QMR_2003 doe <br />