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Ms Carol Oz Project 880-040 IA <br /> December 5, 2000 <br /> Page 3 of 6 <br /> details are presented on the well logs in Attachment B Monitoring wells were developed and <br /> sampled on September 20 and 21, 2000 <br /> Soil Selection and Analysis <br /> Soil samples were collected every four vertical feet in Geoprobeo borings and at five-foot <br /> intervals during monitoring well installation A maximum of three soil samples per boring were <br /> submitted to Sequoia Analytical, a California State-certified laboratory and analyzed for the <br /> presence of total petroleum hydrocarbons quanitifed as gasoline (TPH-g), benzene, toluene, <br /> ethylbenzene, total xylenes (BTEX), and methyl tertiary-butyl ether(MtBE) by <br /> U S Environmental Protection Agency (EPA) Methods 8015 Modified and 8020 MtBE <br /> detection was confirmed by EPA Method 8260 No additional oxygenate analysis of soil <br /> samples was conducted based upon non-detection of diisopropyl ether(DIPS), ethyl tert butyl <br /> ether (ETBE), tert amyl methyl ether(TAME), tert butyl alcohol (TBA), 1,2-dichloroethane <br /> (1,2-DCA), ethylene dibromide (EDB), methanol, and ethanol in excavation soil samples <br /> collected during product line upgrade and overexcavation activities at depths ranging from 3 to <br /> 10 feet bgs <br /> Groundwater Analysis <br /> Groundwater samples collected form Geoprobee borings and monitoring wells were submitted to <br /> Sequoia Analytical for analysts Groundwater samples from the Geoprobe° borings and <br /> monitoring wells were analyzed for the presence of TPH-g, BTEX, and five oxygenates (MtBE, <br /> DIPE, ETBE, TAME, and TBA) using EPA Methods 8015 Modified, 8020, and 8260, <br /> respectively Groundwater samples collected from monitoring wells were also analyzed for <br /> methanol, ethanol, 1,2-DCA, and EDB using EPA Methods 8015 and 8260 <br /> i <br /> Well Surveying <br /> Upon completion of well construction, the wells were surveyed by Farley Surveying, a licensed <br /> surveyor, for location and elevation relative to mean sea level Groundwater gradient was <br /> interpreted utilizing wellhead elevations and measured depths to water The surveyor's report is <br /> included at Attachment C <br /> Well Search and Conduit Study <br /> A search for domestic, municipal, agricultural and industrial wells within a 2,000-foot radius of <br /> the site was conducted The Department of Water Resources (DWR) was contacted as well as <br /> other municipal water suppliers The well search indicated that there was one Caltrans irrigation <br /> well located within a 2,000-foot radius of the site The Caltrans irrigation well was located at the <br /> Sa DP-I19gCPFPl1COXE IOMGonsulaingUalalShamdlPrgeclsLnuc1880.O4O JAaa.doc IT CORPORATION <br />