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Rock types <br />Recovery values <br />Rock Quality Designation (RQD) values <br />Saturated hydraulic conductivity and secondary porosity <br />Rock descriptions including fracturing and jointing pattems <br /> <br />A CDM geologist will also conduct the necessary tests to determine hydraulic conductivity of <br />the aquifers as requested by the SWS. CDM will collect static water levels from each of the <br />new and existing piezometers at the time of boring, at 24 hours, and at 7 days. It is assumed <br />that County staff will continue to collect monthly water levels on both the new and existing <br />piezometers thereafter for at least 18 months in order to obtain information on the seasonal <br />high water table. <br /> <br />Task 3.4 - Reconnaissance Magnetic Survey <br /> <br />Geologic maps of the landfill site region indicate the possible occurrence of diabase dikes in <br />the vicinity of the Cabarms County landfill. A diabase dike is basically an area where molten <br />material has intruded into rock near the surface. Diabase dikes are often preferential paths for <br />ground water flow. For this reason, the SWS is likely to request that a surface geophysical <br />survey be conducted to determine the existence of diabase dikes on the proposed sites. The <br />purpose of the magnetic survey will be to provide geophysical evidence of the presence or <br />lack of diabase dikes at the proposed site. CDM w/Il retain a qualified subconsultant to <br />perform the magnetic survey. The cost for the survey is included in the allowance for <br />geoteclmical drilling work in Section 4 of this Amendment. The scope of services for the <br />magnetic survey work will include the following: <br /> <br />3.4.1 <br /> <br />Review of Available Aerial Magnetic Data - CDM's subconsultant will acquire and <br />review available aerial magnetic data of the Cabarms County Region. This review <br />will precede any geophysical field work and be incorporated into the approach of our <br />survey. <br /> <br />3.4.2 <br /> <br />Magnetic Survey Field Work - CDM's subconsultant will perform a limited magnetic <br />survey to include at least two survey lines across both Option A and B. The work will <br />be performed with a portable magnetometer/gradiometer. We estimate that this work <br />will require about one to two days in the field. Survey line locations will be selected <br />by CDM. The intent is to select lines which would cross typical dike trends at right <br />angles. The CDM subconsultant will locate these lines in the field by estimating <br />distances to site features and using corresponding topographic maps. Data will be <br />collected at 25 to 50 foot intervals as selected by CDM and the subconsultant. Any <br />magnetic anomalies indicating a diabase dike will be flagged along the survey line as a <br />temporary marker. <br /> <br />3.4.3 <br /> <br />Analyses and Reporting - CDM and the subconsultant will analyze the magnetic data <br />to estimate the location of any significant magnetic features encountered in our survey. <br />Detailed analyses wkich involve computer modeling are not included in this scope of <br />services. Man-made interference to include power lines, buried objects, and traffic can <br /> <br />n:xcabarmaxamendT.cab Page 6 of 18 <br /> <br /> <br />