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.€..c •Tx. ,.gx- =rwWit <br /> ,. :y — .j-ria x�"'s •.` .`"''.3 'd�jY we :�.., — ;"`� ' ._ - - „ - _ Us <br /> - <br /> t <br /> l <br /> 4 <br /> E <br /> i <br /> t �iC�y <br /> r <br /> Mr. Ron Valinoti 4 July 25, 1989 <br /> Comment 5 <br /> Laboratory detection limits proposed for the verification samples were not <br /> included in the workplan. Submit the limit of quantification proposed <br /> during excavation. <br /> Response_5 <br /> The sample analyses will be conducted at the following laboratory detection <br /> limits: <br /> i <br /> Ietection Limit_ <br /> Water Soil <br /> Analysis (mg/1) (mg/ka) <br /> TEPH (Total Extractable Petroleum Hydrocarbons 1. 10, <br /> (EPA Method 2515: water; EPA Method 2520: soil <br /> TVPH (Total Volatile Petroleum Hydrocarbons; 0.020 0.0010 <br /> (EPA Method 8015 modified: water; EPA Method <br /> 8015 modified: soil) <br /> Purgeable Halocarbons 0.0005 0.02 <br /> (EPA Method 601: water; EPA Method 8010: soil) i <br /> Pur gsable Aromatics 0.005 0.2 <br /> + (EPA Method 602: water; EPA Method 8020: soil) P <br /> o n <br /> F' Contaminants remaining at the conclusion of the excavation attempt shall be <br /> addressed in a Soils Remediation Plan. This remedial plan can be prepared <br /> in concert with the groundwater investigative results and should include at j <br /> yxs least three options; The Soils Remediation Plan should include a feasibil- f <br /> ity study for each option proposed. <br /> Response 6 <br /> The soil remediation work plan, already submitted to the San Joaquin Local � <br /> Health District, and to which this comment is addressed, outlines the scope <br /> f � of work which is technically necessary .to remove diesel-contaminated soils <br /> from the vicinity of the tank excavation. As described in the plan, fal- <br /> lowing verification of adequate removal by sample analysis, the excavation <br /> will be backfilled with clean gravel . The removed, contaminated soil will <br /> : be stored on-site and will be placed on 50 mil plastic sheeting. A berm <br /> will be placed around the soil, and the soil wi.1 then be covered with <br /> plastic. Contaminated soil will be composite-sampled, and treatment or <br /> x disposal options will be evaluated for economic and technical feasibility <br /> after the analyses are complete. <br /> ------ -------- <br /> Me <br /> s , , <br /> Y; J <br /> noweEnvironmental <br /> y� 4y 4I <br /> l <br />