SITE INFORMATION AND CORRESPONDENCE

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• • Mr. Duane and Ms. Wendy Berdt 4 October 2006 Page 2 The vapor sampling wells will be installed using a hand auger. The boreholes will measure between approximately 4—6 inches diameter and will be drilled to a depth of approximately 5.5 feet below grade.. The borehole will be completed as a vapor sampling well. The well will be secured with a flush mounted, traffic rated steel well box. The groundwater monitoring wells will be installed using a truck-mounted rotary drill rig equipped with hollow-stem augers. The boreholes will measure 8.25 inches diameter and will be drilled to a depth of approximately 44 feet below grade.The boreholes will be completed as a 2-inch-diameter groundwater monitoring wells. The wells will be secured with a locking cap and completed at the surface with a flush mounted,traffic rated steel well box. The work is expected to take approximately 4 days. All materials generated during drilling activities will be stored at the former service station property. As required by the CRWQCB, the wells will be sampled every three months for the groundwater monitoring wells and at least once following their installation for the soil vapor sampling wells. The sampling will require our technician to be onsite for approximately 1 day. All equipment and materials used for sampling will be removed from your site upon completion of the work. We will make every attempt to minimize the impact to your tenants and will notify them prior to the installation of the well. ETIC will be responsible for any damage that may be caused to your property as a result of and limited to the borehole drilling- After completion of the project,the wells will be removed according to the applicable well standards and the drilling location will be properly resurfaced to match the surrounding conditions. G WmjmUW9-CAWuhSW \99-CAS 75 E Alpim Jx