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Page 1 of 3 <br /> <br /> <br />Advanced Geo Environmental <br />Attn: Brian Millman <br />Site: 17200 Murphy Parkway <br />We appreciate the opportunity to provide this report for our work completed on 2/19/2019 at the above address <br />in Lathrop, CA. <br /> <br />PURPOSE <br />The purpose of this project was to scan for with the EMI within the project boundaries provided by the client for <br />possible anomalies, specifically debris pits. The scan area was approximately 6.5 acres. <br />EQUIPMENT <br /> Electromagnetic Induction (EMI), Manufacturer: GSSI, Model: Profiler EMP-400. EM instruments <br />contain two sets of coils that are located on opposite ends of the tool. One set of coils is used to transmit <br />a primary magnetic field, which generates an electrical current into the ground. The induced current then <br />generates a secondary magnetic field, which is sensed by the coils in the receiver end of the instrument. <br />Data is then displayed on a control unit indicating the conductivity of the earth. The data is post- <br />processed and displayed in a color-coded contour map. <br />http://www.geophysical.com/Documentation/Brochures/GSSI-ProfilerBrochure.pdf <br /> <br />Process <br />Scans are collected 3’-5’ on center in any direction so as to cover the entire area. The data locations are tied to <br />GPS coordinates which are used to process the data and create a contour map. The conductivity values in the <br />contour map can then be interpreted as anomalies which could represent UST’s, excavations or other subsurface <br />features. The map can be overlaid on an aerial image using Google Earth. <br />Findings <br />GPRS scanned the area with Electromagnetic Induction equipment, and the following conductivity maps represent <br />the data collected from the scanning process. These conductivity maps, provide information as it relates to the <br />conductivity of the area(s) scanned. GPRS is providing this information for your interpretation. GPRS will simply <br />point out the areas of higher conductivity. It is the responsibility of the customer to further analyze/investigate <br />the information provided. <br />Limitations <br />Please keep in mind that there are limitations to any subsurface investigation. The equipment may not achieve <br />maximum effectiveness due to soil conditions, above ground obstructions(fencing, metal water pipe along the <br />wooden fence, trees, and the home), reinforced concrete, and a variety of other factors. No subsurface <br />investigation or equipment can provide a complete image of what lies below. Our results should always be used in <br />conjunction with as many methods as possible including consulting existing plans and drawings, exploratory <br />excavation or potholing, visual inspection of above ground features, and utilization of services such as Dig <br />Alert/Underground Service Alert. <br />At this site, we experienced some above ground obstructions such as standing water and large trees that limited <br />access for scanning. <br />The following pages will provide photos and further explanation of our findings.