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APPENDIX D <br />• March 2000 -7- 993-2099.150 <br />• <br />3.2 Surface Reconnaissance and Exploratory Excavation <br />During May and June 1998, Golder representatives with previous experience in conducting <br />the exploratory investigation for the Phase III area were on-site to perform the surface <br />reconnaissance within the limits of Phase IV. The work included the development of a <br />written description and photographic record of each feature (copies of the written <br />descriptions and copies of the catalogued photographs have been included in the Golder <br />project files, but are not incorporated in this report). The reference numbering and <br />location of documented surface features is presented in Drawing Nos. 3 and 4. <br />A backhoe with a maximum reach of approximately 20 feet was then used to excavate a <br />representative number of the cone-shaped shallow surface mines. Observations of these <br />excavations were recorded, and the excavated material was then replaced back into the <br />excavation. <br />Over 140 surface features were inspected and documented, and approximately 20 of these <br />were excavated. The results are summarized in Table 1. This table identifies for each <br />feature whether it is an open shaft (and therefore not excavated), or whether the <br />observations made during the excavation of the feature indicated that it was historically <br />excavated completely in surfcial soils, "bottomed" at the bedrock contact, or had <br />previously been excavated down into bedrock. A record was also maintained of any <br />timber that was encountered or observed, indicating that the feature was likely a shaft, and <br />whether any lateral excavations could be identified connecting to the shaft. Some of the <br />features were visually identified as being collapsed tunnel portals, and others have been <br />shown to be such from the documented evidence of tunnels presented in the working plan <br />maps. Such adit portals are identified in Drawing Nos. 3 and 4. <br />The main objectives of the exploratory excavation of the shallow surface mines were to <br />determine if the features were previous shallow mine excavations or deep shafts, (which <br />I:\M99MNAL REP0FfiUMAPPD.DDC Golder Associates