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Y Former Discovery Chevrolet February 10,1998 <br /> I , <br /> Tracy.California Letter Addendum to Work Plan <br /> equipment directly atop the location of the former dispenser, the GeoProbe® equipment <br /> will be placed as physically close as possible to that location. <br /> 4) A boring through-the former pipeline [location] near SB [location] and determine . <br /> vertical definition below groundwater. The proposed boring location that had been,. <br /> situated approximately 15 feet north of the former pipeline will be drilled through the: <br /> location of the former pipeline near the location of the hand-a_ugered soil boring SB. If <br /> we are unable to place the GeoProbe equipment directly atop the location of the <br /> former pipeline, the GeoProbe equipment will be placed as physically close as- <br /> possible <br /> spossible to the north side of that location. <br /> 5) Soil samples shall be collected until both the following conditions are met: a) the- <br /> boring depth reaches below groundwater level and b) field-screening with a portable <br /> organic vapor meter (OVM) indicates two consecutive sapling intervals where no <br /> petroleum hydrocarbons are present. Field screening'with the.OVM will be performed <br /> to evaluate whether the hydrocarbons are actually present within the. soil samples <br /> collected beneath the groundwater surface, or have impacted the sample tools upon <br /> their passing through the groundwater surface. <br /> 6) Water samples from all borings in order to provide subsurface hydrocarbons contour <br /> data. All six proposed GeoProbe® soil boring locations will be changed to proposed <br /> i <br /> Hydropunce locations for a total of nine proposed GeoProbeOD/Hydropunce locations <br /> at the site. <br /> The proposed work has been tentatively scheduled for February 19 and 20, 1998. The drilling <br /> contractor will be V &_W Drilling of Rio Vista, California. Enclosed with this letter is a the <br /> completed SJCPHS/EHD Application for Well/Pump Permit and check for the proposed. <br /> drilling fees. - <br /> i _ ! <br /> F <br /> i <br /> t <br /> 0210jwon 2 HORIZON ENVIRONMENTAL INC: <br />