Laserfiche WebLink
C� <br /> o Final report production. <br /> GENERAL <br /> All work will be performed in accordance with a Health and Safety Plan pre- <br /> pared by Dames & Moore. This Plan is attached as Appendix A. Prior to the <br /> initiation of any drilling, boring locations will be cleared with the City of <br /> F�� Tracy and the Underground Services Alert (USA). Two 20 lb Class A, $, and C <br /> fire extinguishers with current inspection tags and in good working condition <br /> will be present during all field work. <br /> This work will be conducted under the direction of a registered engineer or <br /> geologist. <br /> LOCATE CONCRETE PERIMETER <br /> Purpose <br /> The purpose of this task is to confirm the exact location of the oil reser- <br /> voir's original concrete perimeter. To accomplish this objective, we plan to <br /> 3 first use a portable probing device to locate the edge of the buried concrete <br /> perimeter. On the basis of the probing invesigation, at least three trenches <br /> will be excavated around the perimeter using. a backhoe. <br /> Probing Program <br /> The edge of the buried concrete perimeter will be located using a probing <br /> c� device operated by HanDriven Sampling Company of Antioch, California. The <br /> device consists of a one-inch diameter steel rod which is advanced into the soil <br /> using a hand-held gas driven hammer, similar to a jackhammer (Plate 3). The <br /> device is operated by a two-man crew, responsible for all operations involving <br /> the gasoline or electric powered hammer. This hand-held equipment will <br /> ` encounter increased resistance at the concrete layer, so the presence of the <br /> concrete perimeter would be immediately apparent upon contact. We estimate the <br /> depth of the concrete slab to be approximately 5-7 feet; therefore, the probing <br /> x process should be rapid. Probes will be advanced under the supervision of a <br /> ' Dames & Moore geologist or engineer to a maximum depth of 15 feet. If no <br /> concrete has been encountered at 15 feet, then it will be assumed that the loca- <br /> JED2/H <br /> -2- <br />