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Ms Vicki McCartney <br /> Page 2 of 2 <br /> '40 drums, which were stored onsite pending disposal All liquid waste generated from groundwater sampling <br /> activities was transported off-site by American Valley Waste Oil, Inc for disposal at a licensed <br /> disposal/recycling facility A copy of the load receipt is included in Attachment A <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 42359) 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 801513, benzene, toluene, ethylbenzene, xylenes (BTEX) using EPA method 8021B, and <br /> oxygenated gasoline additives, including the lead scavengers EDB and 1,2-DCA, using EPA method 8260B <br /> Well MW3 contained TPHg and ethylbenzene at 150 parts per billion (ppb) and 1 2 ppb, respectively No <br /> gasoline constituents were detected in wells MW1 and MW2 Groundwater analytical results are <br /> summarized in Table 2 Laboratory reports are included in Attachment B Charts showing contaminant <br /> concentration trends are included in Attachment C <br /> SUMMARY AND CONCLUSIONS <br /> The depth to groundwater beneath the site ranged from 10 90 to 1141 feet btoc Groundwater flowed <br /> north with a gradient of approximately 27 feet per mile <br /> • TPHg and ethylbenzene were detected in well MW3 at 150 ppb and 12 ppb, respectively No gasoline <br /> constituents were detected in wells MW 1 and MW2 <br /> • No dissolved gasoline constituents were present in any site well at levels exceeding primary or <br /> secondary 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 /> Respectfully, aeD G — <br /> Ground Zero Analysis, Inc <br /> 4-4, � jOHP oa <br /> John P Lane O LANA <br /> CA Registered Geologist No 6795 Na <br /> No 6795 <br /> Attachments OF C AL�FO4 <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 1GROUNDZE15ouza\ReportslQMR1200411QMR 2004 doe <br />