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VVZ1 INC <br /> 3.3 Instrument Limitations <br /> 1. Cultural interference like chain link fences, power lines, reinforced concrete, <br /> surface metal objects and metal walled buildings affect the geophysical readings. <br /> Data within 10 to 20 feet of the interfering source can produce unusable results or <br /> may mask the weaker signal of a possible anomaly. <br /> 2. The magnetometer and ground conductivity instruments rarely detect pipes or any <br /> ' objects made of plastic, concrete, most ceramics or clay. <br /> 1 <br /> 05300010.001 5 <br />