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Ellf�yt� • Mr James Barton November 2, 2004 Page 4 benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA Method 8021, total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 Modified and methyl tertiary butyl ether (MtBE), 1,2—dlchloroethane (1,2-DCA), and 1,2—dibromoethane (EDB) using EPA Method 8260B Additionally, selected samples will be analyzed for total lead using EPA Method 6010B for waste disposal purposes Field methods and procedures to be used by ENSR during drilling and installation of the proposed well are summarized in Attachment B ' Groundwater Monitoring Well Installation The groundwater monitoring wells will be constructed using 2-inch diameter, flush-threaded, Schedule 40 PVC casing The casing for well MW-31 will be installed to a total depth of approximately 90 feet bgs The well will be screened from 85 to 90 feet bgs with a 0 02-inch machine-slotted casing The casing for well MW-32 will be installed to a total depth of approximately 103 feet bgs The well will be screened from 98 to 103 feet bgs with a 0 02-Inch machine-slotted casing Final screened Intervals will be based on field observations The annular space for each well will be filled with No 3 Lonestar, or equivalent, sand (filter pack) from the maximum depth of the well to 2 feet above the top of the well screens A minimum of 2-foot thick bentonite seal will be placed above each filter pack Above the upper bentonite seal to 1 foot bgs the annular space will be sealed with neat cement grout A concrete surface seal will be Installed to set the traffic rated vault boxes Proposed well construction details are presented in Figure 3 Soil Stockpile It is anticipated that drilling activities will generated approximately 20 cubic yards of soil cuttings The cuttings will be placed in 55-gallon DOT-rated drums and temporarily stored onsite It is anticipated that the drums containing soil drill cuttings and drums containing rinse water will be transported as non hazardous waste to an approved facility within 90-days Well Development and Groundwater Sampling The newly installed groundwater monitoring wells will be developed a minimum of 72 hours after their installation This will allow the neat cement grout seal time to cure The wells will be developed using a surge block and submersible pump Groundwater samples will be collected from the monitoring wells following development a minimum of 24 hours after development is completed Groundwater samples will be submitted to a state-certified laboratory under chain of custody protocol for analysis of TPHg using EPA Method 8015M, and BTEX, MtBE, 1,2 DCA, and EDB by EPA Method 8260B Additionally, groundwater samples from wells MW-31 and MW-32 will be analyzed for concentrations of nitrates, sulfates, iron (II), and manganese (II) using previously described methods Dissolved oxygen readings will--also—be—collected-from-wells- MW-31 IIL_aiso_be—collectedfromwells_MW-31 and MW-32 11DcsacramentolprojectslProjects10694015098-293TinaAReportslWork PlansM%Work Plan-SVE AS System doe ^i ;.t' - 'I c Ypc+r ^,Z' I��.,-- , `7".,,,m�nf�