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Advanced GeoEnvironmental, Inc <br /> January 3, 2012 <br /> Page 3 <br /> reflections. The deeper continuous reflections are defined throughout the survey area and are <br /> indicative of a hard pan layer that varies from about 0.5-to 2.0-ft below the asphalt pavement. It <br /> is deepest south/southeast of the planter and shallowest in the north central portion of the <br /> survey area. Most of the isolated reflection patterns correspond with the detected utilities <br /> mentioned above. However, there are some that define two additional possible utilities that trend <br /> south and east from the planter. Since the utilities were not detected by the MD, we believe that <br /> they are nonmetallic in nature. Our analysis of the GPR data did not define reflection patterns <br /> within the upper 3-to 4-ft typical of a UST or UST associated excavation within the designated <br /> survey limits. <br /> 4.0 LIMITATIONS <br /> There are general limitations unique to the geophysical methods used for this investigation. For <br /> example, USTs may be buried deeper than the detection capabilities of the geophysical method. <br /> There may be a lack of contrast in physical properties between native soils and buried objects, <br /> especially if they are nonmetallic. Above or below ground cultural features, such as utilities, may <br /> cause interference that limits or masks the detection of a nearby buried UST. Since the accuracy <br /> of our findings is subject to these limitations, it should be noted that not all USTs and buried <br /> objects or features can be detected or characterized by the geophysical techniques used for this <br /> investigation. <br /> 5.0 STANDARD CARE AND WARRANTY <br /> The scope of NORCAL's services for this project consisted of using geophysical methods to <br /> characterize the shallow subsurface. The accuracy of our findings is subject to specific site <br /> conditions and limitations inherent to the techniques used. We performed our services in a <br /> manner consistent with the level of skill ordinarily exercised by members of the profession <br /> currently employing similar methods. No warranty, with respect to the performance of services or <br /> products delivered under this agreement, expressed or implied, is made by NORCAL. <br /> We appreciate having the opportunity to provide you with this information. <br /> Respectfully, <br /> NORCAL Geophysical Consultants, Inc. <br /> tom 0�d d - <br /> Donald J. Kirker <br /> Professional Geophysicist, PGp-997 <br /> DJK/tt <br /> Enclosure: Plate 1 <br /> Appendix A GEOPHYSICAL METHODOLOGY <br />