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GEOPHYSICAL RECONNASSAINCE- <br /> The basic approach will follow this general procedure <br /> 1 . Identify cultural features that will affect the data, <br /> (fences, standpipes, metal buildings, vehicles, & other metallic <br /> or electrical sources, ) by traversing the area with a grid or <br /> series of lanes using magnetics & electro-magnetics to evaluate <br /> the gradients & determine how they are affected by subsurface <br /> features such as pipes, tanks, etc The general area of <br /> investigation as shown on the attached PLATE V. <br /> 2 When & if targets are located, induction methods will be used <br /> to attempt to determine the type of feature identified Those <br /> areas will then be marked for further investigative work. If the <br /> sensitivity of the equipment permits, we will also investigate <br /> the area beneath the shop building. <br /> 2 If the result of the above operation is successful an <br /> locating previously unknown UST' s or product lines on the <br /> property, the necessary workplans & permits will be obtained from <br /> the San Joaquin County RHD, and they will be removed and required <br /> soil samples taken and analyzed If offsite sources are identi- <br /> fied or indicated, we will provide that information to the appro- <br /> priate government agencies for action <br /> Our client is in the process of obtaining a trespass agreement <br /> with the owner of the property to the west so that we may include <br /> that area an our survey, and allow us to place soil/water probes <br /> on that site if deemed necessary <br /> SOIL & GROUNDWATER INVESTIGATION - (SOIL PROBES ) <br /> An analysis of the data obtained to date indicates that there are <br /> two (2) areas of soil & groundwater contamination beneath the <br /> site one in the area which contained the diesel tanks, and the <br /> other associated with the waste oil tank, the removed septic <br /> system, and the area to the west of the maantaanance building. <br /> The estimated "zero" lanes an the groundwater for TPH-D & BTEX & <br /> TPH-G are shown on the attached PLATE VI . In order to fully <br /> define those limits, we propose to place up to ten (10) geoprobes <br /> in the approximate locations indicated on that plate . If the <br /> results of the geophysical survey reveals other possible sources, <br /> we will include those areas in our work; a brief addendum showing <br /> any additional locations will be submitted of needed. Field <br /> procedures will include the following <br /> 4 <br />