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�i <br /> a <br /> Mr. Fred Long 3 AUG N 5 1983 <br /> August 17, 1989 <br /> AM <br /> - Composite sail samples were collected from WWORpWiles and analyzed for <br /> TEPH. Five composite samples were collected for the contaminated stockpile <br /> and two were collected for the clean stockpile. The stockpiles were then <br /> covered with six-mil polyethylene sheeting. Analyses of the contaminated <br /> W-ded can TEPH. <br /> 3 op ons. fcr treatment and/or disposal of stockpiled soils w - <br /> ,.� addressed in a separate letter to POKStracal, Inc. A summary of the <br /> stockFle-nnRiyses-i"iverritr-Table-- :---Gamp-Iete-e­erI <br /> reports are in Appendix A. <br /> c # <br /> Analytical Results and Recommendations <br /> The verification soil samples summarized in Table 1, yielded detectable <br /> concentrations in only two of eight samples collected for TEPH (diesel). <br /> These samples, W-2 and E-1, indicated concentrate-ws of 51 and 37 mg/kg, <br /> respectively. Although there is no regulatory lir�it estah.lisied for <br /> r diesel, the concentration III be left in,place "without <br /> threatening ground wets s 100 mg/kg a rding to the Leaking Underground <br /> Fuel' Tank Tank Field Manu a <br /> x <br /> Board, May 1588 an t 4arch 1949), Trace concentrations of toluene were <br /> detected in Soil Samples E-1, N-1/N-2 composite, and S-1/S-2 composite at <br /> r� <br /> levels of 0.048, 0.028, and 0.026 mg/kg, respectively. No other detectable <br /> concentrations'of any constituents were found in the verification soil <br /> samples. Additionally, as shown in Table 3, no detectable concentrations <br /> i of any constituents were found in the ground water samples from the <br /> monitoring well Immediately adjacent to the former tank location. <br /> The.tank excavation'area was backfilled with imported soils after receiving <br /> ;the;above ,analytical:reauits from the laboratory confirminp. closurs. JU <br /> ur e'r remediation the former tank area nor 4round water monitoring is <br /> recommended. To allow for lant ex ensignens, it is reco " <br /> t emonitorine ulube destroyed1n accordance wzth "Watar We11 Standards: <br /> State of California" 0e artment Of-WateT Resources, oul.letin 74-8 <br /> 0ecem er 1581 . - Csnonio'cons ders:closure o t e un ergro�and <br /> r =`s�orage tan r coma . <br /> an have you If .. <br /> Fyy y y yues:ions concerning this letter, please call me at (415) <br /> 573-6012 or Elliott Bruhl at (303)790-1747. <br /> Very truly yours <br /> 1 , <br /> _ l--- -- ---Lan ce_D._Gesel.bracht, P.E.--- -...--- - ----- ---- <br /> a Project Manager <br /> LOG/rr <br /> Attachments <br /> ®��eEnvironmental <br />