Laserfiche WebLink
July 14 , 1987 <br /> 0714RNIB <br /> Page 2 <br /> 4. (Continued) <br /> samples showing the highest detected levels of hydrocarbons <br /> in each boring by TPH analyses will be analyzed for BTEX <br /> (EPA Method 8020 ) , tetraethyl lead (DOHS Method for organic <br /> lead) , and ethylene dibromide (EPA Method 8010) . Selected <br /> water samples will be analyzed for tetraethyl lead and <br /> ethylene dibromide. <br /> 5. We have attached a modified Generalized Site Plan (Plate P-3 <br /> in the original work plan) , which shows the layout of piping <br /> to the best of our present knowledge. There are apparently <br /> no "as built" plans available at present, and thus these <br /> locations are approximate at best. Any new information <br /> regarding line locations will be reflected in future <br /> correspondence as they become known. <br /> Local topography is generally planar, sloping very gently to <br /> the southwest. <br /> Known wells within 2 , 000 feet of the station are located on <br /> Plate P-2, and have been sampled as reported previously. <br /> 6. The purpose of this investigation is to constrain the source <br /> and extent of soil and ground water contamination at this <br /> site. USA is committed to defining the source of the <br /> problem, and correcting it as soon as possible. Applied <br /> GeoSystems will prepare and submit a report detailing the <br /> work performed and results of analyses within four weeks of <br /> initiation of field work at the site. At that time, we will <br /> propose a suitable mitigation program, which may include an <br /> initial phase designed to provide further information with <br /> regard to the extent of contamination. Additional work may <br /> involve drilling in off-site locations or may be confined <br /> to the site itself. The information derived from this <br /> investigation is necessary to define the scope of any future <br /> work. A full "Problem Assessment" report may require <br /> additional information not available at the end of the work <br /> proposed for this investigation. These needs will be <br /> addressed as soon as possible after they are defined. <br /> We have attached a copy of the guidelines for addressing fuel <br /> leaks put out by the San Francisco Bay Region of the CRWQCB. <br /> It is by these guidelines that we recommend EPA Method 8020 for <br /> BTEX and TPH analyses in those cases, such as these, where <br /> gasoline is the suspected contaminant. <br /> AA,o/led GeoSystems <br />