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7/12/96 <br /> Mr. Michael Infurna <br /> Page 3 <br /> Method of cleanup proposed or implemented and a time table or schedule for the <br /> completion of the procedure. <br /> As I have explained, it seems that further cleanup activities may not be necessary or <br /> warranted. At most, additional groundwater monitoring might be performed as a further <br /> precaution. <br /> Method and location of disposal of the releases hazardous substance and any <br /> contaminated soil or groundwater. <br /> Please note that purgewater is being transported to Seaport Environmental in Redwood <br /> City for treatment. You should note that Seaport is permitted to accept nonhazardous <br /> wastewater, such as groundwater generated from a UST investigation. Please consider <br /> this the status quo unless you receive different information in the future <br /> Manifests for the transport"of any hazardous substances. <br /> Not applicable. Please consider this the status quo unless you receive different <br /> information in the future <br /> Groundwater elevations and hydraulic gradient and direction, pH, conductivity, <br /> and temperature of the groundwater, and the status of all the wells and the boxes <br /> protecting them. <br /> I believe the reports we have provided contain all of this information. If this is not the <br /> case, give me a call so we can comply with your request. <br /> Site maps showing the wells, the current and past structures, and the "zero lines" of <br /> contamination. <br /> �Alisto has been instructed to update the site plan per your request. I would like to have <br /> a firmer grasp on the basis for the request for a"zero line" before we amend the report <br /> format. I suspect that this information would be used to evaluate the stability of a <br /> petroleum hydrocarbon release, however, I am concerned that there is often a <br /> considerable degree of uncertainty associated with the exact position of a"zero lines", <br /> and the use of"zero lines" fails to properly convey the degree of uncertainty inherent in <br /> all subsurface investigations. There have been many occasions in the past where we have <br /> been presented with contouring data, and have subsequently obtained more data. I <br />