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Ms.-Mary Meat's- Page 2 <br /> Jule 8, .1993 <br /> • 'Total Lewd.(SW-846-Method 6010). <br /> -The-results, .f the laboratory_analyses -are summarized-in-Table I.- The <br /> laboratory analyses and -chain-of-custody--forms'areincluded in Attachment A. <br /> No°TPH-G;:TPH=D, or BTEX°compounds were detected.in the_samples=which <br /> were analyzed. Total-lead.was deiecfed in concentrations of 1T and 12 mg/kg; _ <br /> respectively; these levEls are.well within:t- established background levels- <br /> for total lead at the subject,site.: <br /> -.Resl2onse to PHS EHD_Comments <br /> Tlie_following points have been developed .in_Y6r ponse'to your comments <br /> _arid=..concerns: ... <br /> {1_) :PHS%EHD questions.the validity:-of ERM-West's-soil sampling and analysis <br /> program=partially because it. conducted-without PHS/:EHD inspection. <br /> P g= : . y -w <br /> -. The-sam lin and anal.-ss were conducted with strict adherence to <br /> applicable regulatory accepted methods and procedures, and the absence of <br /> a PHS/EHD. nspeetor :at-the time of sample collection'does not-Invalidate <br /> the resuit"s:. <br /> (2)-No TPH-D was deflected;in_the sarimples which were analyzed=during'this. <br /> investigation. -it is possible that-the diesel had undergone degradation <br /> m. during :the-time that.,,the `sail-remained stockpiled-at the site. <br /> It should.be_noted.that the=lAugust_,19.91 composite sample°analysis <br /> indicated-a­Iow concentration of TPH D in.the_stockpiled soils; the TPH-D <br /> _ ,concentration in thesampl' was22 mg/kg. Although these <br /> concentrations represent _detectable. quantities_ _of diesel, the LUFT Field <br /> 1Vlanual indicates that such concenaratloris of (fie : an be'left in place <br /> without threat enrig ground=water <br /> 1 California.State Watet Resources Control Board,Leaking UndergroundFuel Tank Field. <br /> Manual:.Guidelines-for Site-Assessment,Cleanup,and Underground Storage Tank Closure,:.;_ <br /> October.1989;7page.-29.. - - <br />