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L. rieologiuITedvdama Page 4 Sinclair&Thompson Property Additional Soil Gas Survey Report June 18,2007 L- equilibrium period was performed at each boring. After equilibrium was reached each sample point was purged as described below. ❑ Second, prior to collecting the sample, I,I-Diflouroethane (1,1-DFA), a tracer, was +r applied to the ground surface around the drive rod, above the hydrated bentonite, and around the connection of the tubing to the syringe of each boring. LO Purge/Sample Flow Rate The purge and sampling flow rate was between 20 to 200 ml/min. Thus avoiding or reducing the potential problem of stripping or ambient air dilution from occurring. A new plastic syringe was used at each borehole. Sample Tubing L• The polyethylene tubing was approximately '/8-inch diameter (i.d.) and new tubing was dedicated to each sample point. LN 2.2.3 Sample Handling Procedures a A new syringe and polyethylene tubing were used on each of the soil gas samples collected during the soil gas investigation. The laboratory technician wore disposable gloves while '" collecting syringe from the boring. The laboratory technician wore disposable gloves while analyzing the collected vapor samples. Gloves were changed with each sample collection_ 2.2.4 Soil Gas Analytical Procedures TEG mobile laboratory and direct push service was selected for the soil gas investigation at LO the Property. A certified mobile lab mobilized to the Property and performed soil gas analysis for BTEX, TPHg, and MtBE using a GC/MS by method 8260B. • The leak-check compound (I,l-DFA) with a detection limit of 10 µg/L was used. • A probe blank was analyzed for the leak compound and chemicals of concern. LO • A duplicate sample was run on SG-9. ~ 2.25 Soil Gas Survey Results LO & All three (3) soil gas samples, all purge volumes, the duplicate, and the probe blank were non-detect above laboratory reporting limits for the leak check compound, ` benzene, ethyl benzene, o-xylenes, and MtBE. LW • Each of the SG-7 soil gas samples show the presence of all toluene and m,p-Xylene constituents. The samples were nom-detect for all other analyzed constituents. • The SG-8 soil gas sample showed the presence of all toluene, m,p-Xylene, and TPHg V constituents. The sample was non-detect for all other analyzed constituents. • SG-9 and SG-9 duplicate soil gas samples show the presence of all toluene, m,p- Xylene, and TPHg constituents. The samples were non-detect for all other analyzed constituents. • Laboratory Data Sheets are included as Appendix A.