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"�``�.'a;'_ F .fi •$ 6 _ '^'�'� '''c�si`'.' bhpp T o-. "��`,��._""°°n � ""td � <br /> '�a ` � Y^`a€r+�"�' c� � .3 `P .,...,.lrr�� � �y. ° ,.�.1•+ � .y.rd"�` �e #'� �.�,-. � �'^d', <br /> r <br /> Chevron/South Center 11 <br /> November 1989 <br /> Soil samples will be analyzed for the presence of benzene, <br /> toluene, ethylbenzene and xylenes (BTEX) , and for TPH-as-gasoline <br /> using modified U.S. Environmental Protection Agency (EPA) Methods <br /> - 5030/8020/8015. Samples taken from the vicinity of the waste- <br /> ail tank will also be analyzed for the presence of TPH-as-diesel <br /> using EPA Method 8015, for the presence of total oil-and-grease <br /> (TOG) using EPA Method 3550/APHA SM 503B, for TPH-as-waste-oil <br /> using APHA SM 503 E/IR, and for the presence of cadmium (Cd) , <br /> chromium (Cr) , lead (Pb) , and zinc (Zn) , using Methods 7005/6010. <br /> SOIL BORING AND WELL INSTALLATION <br /> If during soil excavation there is any evidence that leaked <br /> hydrocarbons may have impacted the groundwater beneath this site, <br /> Chevron will install groundwater monitoring wells. If wells are <br /> required, they will be installed using the following procedures. <br /> Soil borings will be drilled as required to assess the <br /> Y. lateral extent of gasoline-hydrocarbons in the soil. Figure 3 <br /> shows the approximate locations of the preliminary borings. <br /> Actual placement of the soil borings will be determined by the <br /> areal extent and configuration of any excavation pits, overhead <br /> - obstructions, site conditions, field safety considerations, and <br /> the availability of appropriate permits. Borings will be drilled <br /> and sampled in accordance with attached SOP 13, with the <br /> intention of installing 4-inch-diameter wells. Based an regional <br /> E groundwater information, the depth to groundwater is anticipated <br /> to be approximately 50-feet below grade surface with a west to <br /> northwest gradient direction. As such, GTI expects any wells to <br /> .� be approximately 70-feet deep. During drilling, if a laterally <br /> continuous aquitard layer of a thickness of at least 5 feet is <br /> encountered below the first encountered water, the boring will <br /> I,i GROUSMV.-i'i rR <br /> TmiNOWGY.!\'C. <br /> ,. e <br />