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F <br /> F <br /> 2417 West Lane, Stockton <br /> Page 2 <br /> The EHD fife for the former waste oil UST refers to different sizes of the UST (i.e. 200 <br /> gallon, 500 gallon, 600 gallon). In order to know the depth to the bottom of the UST <br /> where samples are to be collected, the construction of the tank should be confirmed. <br /> The work plan proposes manual sampling from two vertical borings. In discussing this <br /> with your consultant this was confirmed to be hand augering to obtain the soil samples. <br /> The preferred investigation is to perform slant borings in order to obtain soil samples <br /> from beneath the UST. The work plan implies that only manual sampling could occur <br /> inside the building. Please be advised that probe borings, performed by equipment <br /> inside a van that is driven into the building, can be used to slant bore and obtain soil <br /> samples from beneath the UST. It appears from the picture provided in the work plan of <br /> the transmission building that a van can be driven into the building. <br /> i <br /> An EHD well permit must be obtained for exploration holes (borings)whether they are <br /> performed manually or mechanically. If the depth o the boring is limited to 10 feet, <br /> specific registered professionals can obtain the permit. If the depth of the boring is <br /> greater than 10 feet, a C-57 licensed contractor must obtain the permit. <br /> The work plan proposes analyzing the soil samples for TPH as diesel and motor oil. The <br /> analysis required to be performed on soil samples, to sufficientfy investigate for waste oil <br /> contamination, is for TPH as gasoline and diesel using EPA Method 8015M or 8260; <br /> BTEX using EPA Method 8020 or 8260; chlorinated hydrocarbons using EPA Method, <br /> 8010, 8240 or 8260; MTBE, TBA, DI PE, EtBE, TAN E using EPA Method 8260, metals <br /> using ICAP Method 6010 or AA Method 7000; PCB using EPA Method 8270 or 8080. ' <br /> In order for EHD to properly evaluate your site for releases from UST's the concerns <br /> discussed above should be addressed in an addendum to the submitted work plan. <br /> If you have any questions contact me at (209)468-3449. <br /> Donna Heran, RENS, Director <br /> Environmental Health Department <br /> Margaret Lagorio, Supervising REHS <br /> Unit IV <br /> a <br /> c: Environeering Inc. —G.W. Roy <br /> I <br />