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1 _ i <br /> 1 <br /> • Mr .lames Barton <br /> 1 August 25, 2005 <br /> Page 2 <br /> 1 samples were logged using the Unified Soil Classification System (USCS) visual and manual <br /> methods Soil samples were field screened for the presence of volatile organic compounds <br /> 1 using a photoionization detector (PID) The soli boring log containing PID readings, USCS <br /> descriptions, and other pertinent drilling information are included in Attachment C <br /> Soil Sample Analytical Results <br />' 4 <br /> Selected soil samples collected from AS-33 at depths of 5, 10, 15, 20, 25, 30, 35, and 0 feet <br /> bgs were submitted to California Laboratory Services (CLS) in Rancho Cordova, California <br /> under chain-of-custody protocol Soil samples were analyzed for benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) using EPA Method 8021, total petroleum hydrocarbons <br />' as gasoline (TPHg) by EPA Method 8015 Modified, and for 1,2-dibromoethane (EDB), <br /> 1,2-dichloroethane (1,2 DCA), and oxygenates methyl tertiary butyl ether (MTBE), dl-isopropyl <br /> ether (DIPE), ethyl tertiary butyl ether (ETBE), tertiary butyl alcohol (TBA), and tertiary amyl <br />' methyl ether (TAME) all by EPA Method 8260B The additional samples collected in the <br /> saturated zone were composited by the lab and analyzed for total lead by EPA Method 6010, <br /> and for the parameters listed above Soil samples were collected using procedures described in <br /> Attachment D Excluding the composite sample taken from the saturated zone, concentrations <br /> of BTEX, TPHg, MTBE, EDB, and 1,2-DCA were not detected at or above the laboratory <br /> reporting limits in soil samples collected during this investigation Soil sample analytical results <br /> are summarized in Table 4 and copies of the laboratory analytical reports are included in <br /> Attachment E <br /> Air Sparge Well Installation <br /> Air sparge well AS-33 was constructed using 2-inch diameter, flush-threaded, Schedule 40 <br /> polyvinyl chloride (PVC) casing installed to a total depth of approximately 91 feet bgs AS-33 <br /> was screened from approximately 85 feet to 90 feet bgs with a machine-slotted casing having <br /> 0 020-inch slots Number 3 Monterey sand filter pack was placed from the base of the boring to <br /> approximately 2 feet above the top of the well screen A 2 5-foot thick bentonite seal was <br /> emplaced above the filter pack, and the remaining annular space was filled with neat cement <br /> nrni jt to annrnYimately 1-fnnt hnc Tha tnn of tha wall wac rmmnlptimd with n fli igh nrnrie <br /> I -11 —^ j —a— —r r U <br /> traffic-rated vault box set in concrete A well completion diagram for well AS-33 is presented on <br /> the boring log in Attachment C <br /> J 4ProlectsW694015098-2931WorkirglReports15098 Well Installation Report AS-33 doc <br /> ® Celebrating 35 Years of Excellence in Environmental Services <br />