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yi <br /> 7 <br /> .1 <br /> than 70 feet below ground surface (bgs) r it is further requested <br /> groundwater investigation be set forth <br /> that no requirement foL a <br /> at this time. <br /> tes of soil samples will be acquired <br /> Sample blanks and/or duplica <br /> as specified by <br /> the County of San Jthoroug y All <br /> dnwith <br /> equipment will be steam clby a eaned or thoroughly <br /> tion followedte and betwe nsalllrinse prior to <br /> samplings <br /> alconox solution <br /> being <br /> All tasks will be performed under the direction <br /> a quail <br /> geologist working under the direction of a reist e. <br /> cvi <br /> engineer with significant environmental exp <br /> Your approval is requested to remediate any excavated soils <br /> containing elevated levels of fuel hydrocarbons through passive <br /> aeration and/or bioremediation technologies. Although space <br /> minimizing methods are available for both aeration and biological <br /> treatment, frequently the most cost effective format involves <br /> "thin spread landfarming". Here, contaminated soil is spread <br /> over a bermed, hydrocarbon resistant liner <br /> ro aydepth ofli nine <br /> to twelve inches. once positioned, gasoline <br /> leaving soil sufficiently free of fuel hydrocarbons to render <br /> it acceptable for re-use on site or Class III <br /> itansfill disposal. <br /> osed <br /> Should the soil prove resistant <br /> detoxified.aeration, <br /> the soil. would be <br /> that it be biologically <br /> mixed with compost or treated with liquid inoculum in order <br /> to provide for adequate bulking, nutrients, and moisture, as <br /> well as non-pathogenic, hydrocarbon utilizing bacteria capable <br /> of thoroughly degrading the contaminants to carbon dioxide, <br /> and water. This process generally takes between two <br /> minerals, this period, the treatment bed(s) would <br /> to three weeks. During <br /> be monitored for rates of degradation, <br /> formation <br /> of dbioactivity- <br /> Confirmation <br /> ioactidatv ty. <br /> r ra <br /> intermediates, moisture content, y, and would be <br /> Confirmation of the success of the treatment process <br /> through the collection and certifi�dnksaforleach 50Composite yards <br /> samples (one composite from four P <br /> of soil treated) for TPH-G and BTX&E. <br /> Certification of the remediated soil as non-hazardous will be <br /> made prior to profiling for Ce. Re-use III sal king <br /> fuel <br /> a7plication for re-use on site• reduced be below the practical <br /> 4±ydrocarbon contaminants have beetection (i.e. 1 Part per <br /> li its of certified laboratory and 5 parts per billion [Ppb] <br /> s, il' ion [pPm] for rPH-G/TPH-xylenes, and ethylbenzene) is, we <br /> fol: henzene, toluene, total xy <br /> unlerstand, permitted by the San Joaquin County Public Health <br /> Services, Air pollution Control District, and the Regional Water <br /> Quality Control Board. <br /> 3. <br /> est s�mo'ns 111®N+9y'illi <br />