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I Ell�yt® Mr James Barton January 12, 2005 Page 2 The soil samples from each boring were logged using the Unified Soil Classification System (USCS) visual and manual methods Soil samples collected were field screened for the presence of volatile organic compounds using a photoionization detector (PID) Soil boring logs I containing PID readings, USCS descriptions, and other pertinent drilling information are included in Attachment C Soil Sample Analytical Results Selected soil samples collected from MW-31 and MW-32 at depths of 70 feet and 35 feet bgs, respectively were submitted to California Laboratory Services (CLS) in Rancho Cordova, California under chain-of-custody protocol Soil samples were analyzed for benzene, toluene, ethylbenzene, and total xylenes (BTEX) using EPA Method 8021, for total petroleum hydrocarbons as gasoline (TPHg) by EPA Method 8015 Modified, and for methyl tertiary butyl ether (MtBE), 1,2-Dibromoethane (EDB), and 1,2 Dichloroethane (1,2 DCA) using EPA Method 82606 Soil samples were collected using procedures described In Attachment D Concentrations of BTEX, TPHg, MtBE, EDB, and 1,2 DCA were reported as not detected at or above the laboratory reporting limits In soil samples collected during this Investigation Sall sample analytical results are summarized in Table 'I and copies of the laboratory analytical reports are included in Attachment E Concentrations of TPHg, benzene, MtBE, and 1,2 DCA in sod are depicted on Figure 3 Monitoring Well Installation Groundwater monitoring wells MW-31 and MW-32 were constructed using 2 inch diameter, flush threaded, Schedule 40 polyvinyl chloride (PVC) casing Installed to a total depth of approximately 90 feet and 103 feet bgs, respectively MW-31 was screened from approximately 85 feet to 90 feet bgs with a machine-slotted casing having 0 020-Inch slots MW-32 was screened from approximately 98 feet to 103 feet bgs with a machine-slotted casing having 0 020-Inch slots Number 3 Monterey sand filter pack was placed from the base of the borings to approximately 1-foot above the top of the well screen A 3-foot thick bentonite seal was emplaced above each filter pack, and the remaining annular space was filled with cement grout containing approximately 5 percent bentonite to approximately 1-foot bgs The top of each well was completed with a flush grade traffic rated vault box set in concrete Well completion diagrams for wells MW-31 and MW-32 are presented in Attachment C Well DP_VPlnnm-nt and Samolina Groundwater monitoring wells MW-31 and MW-32 were developed and sampled on December 9, 2004 Copies of the groundwater sampling and development field sheets are Included in Attachment F The wells were developed according to field methods and procedures outlined in Attachment D J Troiects10694M5098 2931WorkinglReporW5098 Well Instailaton Reportdoc ' Celebratma 35 Years of Excellence in Environmental Services