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October 24, 2021 <br /> Terracon <br /> Attn:Yoni Magallanes <br /> Site: 3263 Cherokee Rd Stockton,CA <br /> We appreciate the opportunity to provide this report for our work completed on October 21, 2021. <br /> PURPOSE <br /> The purpose of the project was to search for underground water well within the project boundaries provided by the client. The <br /> scope of work consisted of 1 location measuring approximately 100'x 100'. The client marked the desired locations prior to our <br /> scanning and our markings were then placed onto the surface using red pin flag. <br /> EQUIPMENT <br /> • Underground Scanning GPR Antenna. The antenna with frequencies ranging from 250 MHz-450 MHz is mounted in a stroller frame <br /> which rolls over the surface. The surface needs to be reasonably smooth and unobstructed in order to obtain readable scans. <br /> Obstructions such as curbs,landscaping,and vegetation will limit the feasibility of GPR. The data is displayed on a screen and marked in <br /> the field in real time. The total depth achieved can be as much as 8'or more with this antenna but can vary widely depending on the <br /> types of materials being scanned through. Some soil types such as clay may limit maximum depths to 3'or less. As depth increases, <br /> targets must be larger in order to be detected and non-metallic targets can be especially difficult to locate. Depths provided should <br /> always be treated as estimates as their accuracy can be affected by multiple factors.For more information,please visit:Link <br /> • Electromagnetic Pipe Locator.The EM locator can passively detect the electromagnetic fields from live AC power or from radio signals <br /> travelling along some conductive utilities.It can also be used in conjunction with a transmitter to connect directly to accessible,metallic <br /> pipes or tracer wires. A current is sent through the pipe or tracer wire at a specific frequency and the resulting EM field can then be <br /> detected by the receiver. A utility's ability to be located depends on a variety of factors including access to the utility,conductivity, <br /> grounding,interference from other fields,and many others.Depths provided should always be treated as estimates as their accuracy can <br /> be affected by multiple factors. For more information,please visit:Link <br /> • GPS. This handheld GPS unit offers accuracy down to 4 inches;however,the accuracy will depend on the satellite environment and <br /> obstructions and should not be considered to be survey-grade. Features can be collected as points,lines,or areas and then exported into <br /> Google Earth or overlaid on a CAD drawing. For more information,please visit:Link <br /> Page 1 of 8 <br />