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Health and Safety Plan <br /> 1319 & 1327 South Madison Street, Stockton,CA <br /> 432770 <br /> AEI <br /> Consultants <br /> Electromagnetic Tracing <br /> Vibrocator <br /> Vibrocators are used to detect and trace fluid-filled, non-metallic utilities (for example, PVC or <br /> concrete water lines). A vibrocator system involves a low-frequency pressure wave generator <br /> (called a transonde), which is attached to a faucet, hydrant, or other available fitting. The <br /> transonde produces a continuous vibration or throbbing in the pipe.This vibration can be detected <br /> at the ground surface with a sensitive geophone or ground motion detector tuned to the <br /> transonde-generated frequency. There are two limitations of this technology. One is that all non- <br /> metallic pipes to be traced must be available for connection directly to the transmitter.The second <br /> is that excessive energy imparted to the pi e ma cause damage to the pipe. <br /> Vibrocator <br /> The current technology cannot assure a 100% detection of every underground utility lines and <br /> pipes. No matter who or what method is used to locate underground utilities, never take their <br /> exact location for granted. <br /> 3.4.5 Concrete Scanning <br /> For projects that entail drilling through concrete slabs for the purpose of installing sub-slab vapor <br /> probes or hand clearing/sampling soil underlying the slab,a portable ground-penetrating radar may <br /> be used to evaluate potential utilities,rebar,etc.,embedded in the concrete. A GSSI StructureScanT" <br /> Mini HR all-in-one high-resolution ground penetrating radar unit(and other equivalent devices) is <br /> designed for this purpose. This portable device is able to locate ferrous and non-ferrous targets <br /> (rebar,stainless steel, plastic conduit) in real-time.If anomalies are identified at a proposed drilling <br /> location,additional scanning should be performed in proximity to the proposed vapor location in an <br /> attempt to identify a location free of targets. If an area in the slab cannot be found that is free of <br /> targets, then the drilling work cannot not continue. Concrete scanners must be operated in <br />