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- 1 <br /> Cctober 4, 1991 <br /> Page 4 <br /> Ms. Laurie Cotulla <br /> Tri Valley Growers, Thornton, CA <br /> The WET requires a 10-Fold dilution of ase into the <br /> of ct solution. <br /> Response: tial milligrams 1110 of the <br /> soluble <br /> The results of the extraction g tl is, therefore, eq <br /> constituent per liter of extract(mg ) <br /> concentration expressed in milligrams of soluble constituent ger <br /> kilogram of solid waste. <br /> Clearly then even if all the total lead was in soluble form, <br /> the results <br /> soils in mg1kg- <br /> content in <br /> of the WET could only be olnla analysis of lead is not warranted. <br /> Therefore, further investigate 29, sled soil were field <br /> 1988, g samples of stockpiled <br /> g. Question: on January le, This result was used to determine that the <br /> composited into one ramp swill be <br /> lied soil was no longer contaminated. This method and number <br /> stockpiled osited is unacceptable• Additional boring <br /> of samples comp <br /> necessary to determine that the backfilled soil is uncontaminated. <br /> Response: table at that time. <br /> o WaterWork did not perfofrnptu�office,andtwaslaccep ust some that it was <br /> Resp done with the approval o y <br /> In an October 15, 1990 letter from your office,Darlene o the <br /> had}tial <br /> finished reviewing the file and had some questions on the anals tib <br /> methods used on soil samples from MW 1 to MW4, p <br /> sled soils. The analyses were correct at the bane of roblemowi h <br /> stocln as <br /> ositing. If the County hada p <br /> was the method of comp <br /> method of compositing, it should have been addressed at this time. <br /> Furthermore, at that time and currently in some areas, one composite <br /> nsidered adequately representative for a volume o <br /> sample was/is cof soil <br /> considerably less than 50 yds' it is <br /> The soils were backfilled into the former tank pi <br /> The former P <br /> niroring <br /> surrounded by Inc <br /> wells that would detect any hydrocarbons <br /> leaching into the groundwater. further believes is warrasitecl,it has adequately <br /> characterized these sods a ation within <br /> Please submit a Work Plan for the additional soil investigation <br /> on <br /> g Question: as leach lines provide <br /> 60 days from the e of <br /> Gait sRo date the septic system <br /> the adjacent property, uickl migrates. <br /> conduits through which contamination quickly <br /> TQR1004.wP <br />