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J.. L.01 <br /> O1 December 2006 <br /> AGE-NC Project No. 48-0440 <br /> Page 2 of 6 <br /> L. <br /> Excavated soil was screened for the presence of organic vapor using a using an organic vapor meter <br /> (OVM) equipped with a photo-ionization detector (PID: Thermo Environmental 580, 10.0 eV, <br /> calibrated to isobutylene). Based on OVM readings and field observations, excavated soil was <br /> segregated into impacted soil and clean soil. Only soil exhibiting hydrocarbon odor or measurable <br /> OVM readings was stockpiled for final disposal; the clean soil was used to backfill the excavation. <br /> Approximately 1,300 cubic yards of soil was excavated as part of remedial action at the site. Based <br /> on field observations (OVM readings, stained soil, hydrocarbon odors), impacted soil was <br /> encountered between 8 feet and 15 feet bsg. Approximately 600 cubic yards of petroleum <br /> hydrocarbon-impacted soil was excavated and removed from the site and approximately 700 cubic <br /> �. yards of clean overburden soil was removed and then used as backfill material. Figure 2 illustrates <br /> the approximate location and lateral extent of the excavation. <br /> La <br /> 2.3. EXCAVATION SOIL SAMPLE COLLECTION AND ANALYSIS <br /> Soil samples were collected from the floor and sidewalls of the excavation, utilizing the excavator <br /> bucket by AGE personnel.Excavation samples were collected using a metric soil sampling hammer <br /> loaded with brass sleeves. Soil sample locations are illustrated on Figure 3. <br /> Upon collection,the exposed ends of the sample sleeve were covered with Teflon sheets,capped and <br /> sealed with tape. Each sample sleeve was properly labeled, placed in a chilled container under ice <br /> and subsequently transported under chain-of-custody procedure to Cal Tech Environmental <br /> Laboratory(CTEL),a State of California Department of Health Services(DHS)-certified laboratory. <br /> Soil samples were analyzed for the following constituents: <br /> • Total petroleum hydrocarbons as gasoline (TPH-g) and as diesel (TPH-d) by EPA Method <br /> ,y 8015 Modified; <br /> • Benzene,toluene,ethylbenzene and xylens(BTEX)and methyl tertiary-butyl ether(MTBE) <br /> by EPA Method 826013; and <br /> L.. <br /> �- 2.4. BACKFILLING OF EXCAVATION <br /> On 01 and 05 June 2006, the excavation was backfilled using a combination of pea gravel, clean <br /> native soil removed from the excavation and imported AIB baserock. <br /> Advanced GeoEnvironmental,Inc. <br /> f� <br />