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I <br /> 'Corporation <br /> October 28, 1999 '` A Member of The IT Groep <br /> Page 3 <br /> • Soil Selection and Analysis. Soil samples will be collected every five <br /> vertical feet in the borings. Selected soil samples will be submitted to a <br /> California State-certified laboratory and analyzed for the presence of total <br /> petroleum hydrocarbons quantified as gasoline (TPH-g), benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX), and methyl tertiary-butyl ether <br /> (MtBE)by EPA Methods 8015 Modified and 8020. The highest MtBE <br /> detection from each boring will be confirmed by EPA Method 8260. No <br /> additional oxygenate analysis of soil samples will be conducted based upon <br /> non-detection of DIPE, ETBE, TAME and TBA in over-excavation soil <br /> samples at depths of 11 and 13 feet bgs. In addition the sample <br /> corresponding with the highest benzene concentration will be analyzed for <br /> 1,2-dichloro ethane (1,2-DCA), ethylene dibromide (EDB) and total lead. <br /> Sampling and analytical methods are presented in Attachment B. <br /> • Groundwater Analysis. Groundwater samples will be submitted to a <br /> California State-certified laboratory for analysis. Groundwater samples will <br /> be analyzed for the presence of TPH-g, BTEX, and for five oxygenates <br /> (MtBE, DIPE, ETBE, TAME and TBA) using EPA Methods 8015 <br /> Modified, 8020 and 8260, respectively. Groundwater samples will also be <br /> analyzed for 1,2-DCA and EDB using EPA Method 8260. <br /> • Well Surveying. Upon completion of well construction, the wells will be <br /> surveyed by a licensed surveyor for location and elevation relative to mean <br /> sea level. Groundwater gradient will be interpreted utilizing wellhead <br /> elevations and depths to water. <br /> • Report. A report will be prepared after completion of fieldwork. The report <br /> will include the following: 1) boring logs, 2)boring and well location map, %Z <br /> mile radius well survey, 4) groundwater contour map, 5) soil/groundwater <br /> analytical results, 6) chain-of-custody documentation, and 7) summary of <br /> findings. <br /> SCHEDULE <br /> IT is prepared to initiate fieldwork following approval of this work plan and the issuance of <br /> necessary permits by the SJCEHD. A report documenting the findings of the investigation <br /> is anticipated to be submitted approximately 8 to 10 weeks after commencement of <br /> fieldwork. <br /> 911-011.1 B/0 102/Workpl an <br />