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