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w . <br /> E.y <br /> 1 •4 UNDERGROUND TANK REMOVAL AND PETROLEUM HYDROCARBONS <br /> SOIL IN THE <br /> Three 8, 000-gallon fuel tanks and one 500- <br /> were removed on gallon waste oil tank <br /> Corporation of Rancho Cordova, <br /> 4 February 1986 by American Environmental Manage- <br /> ment California, Personnel of <br /> Groundwater Technology, Inc. (GTI) monitored the tank removal <br /> screened the soils in the tank excavatiand <br /> ons with an HNU photoioni- <br /> Zation detector. Individual soil samples were collected f <br /> locations (S-1 through Figure 4) from six <br /> S-5 ure <br /> :.� g at the time of the tank <br /> excavation, The .samples were taken from areas where petroleum <br /> f 'J; odors and soil discoloration were detected and from <br /> areasbelow <br /> the product tanks and the waste oil tank. These samples were by removing <br /> Soil <br /> a b <br /> ackhoe and then placing. the <br /> .soil in brass tubes. . <br /> The analytical results for these samples <br /> are shown .in Table 3. <br /> The extent of petr <br /> the oleum hydrocarbons in <br /> .1 soil in the tank pit was described in the GTI re or <br /> _ "localized. Prior to the backfillin p t as <br /> sentatives from Groundwater Technologyg o€ the tank pit, "repre- <br /> Health .District determined that and the San Joaquin Local ; <br /> excavation of the minor amount of <br /> ( : 1 contaminated soil -was unnecessary" (GTI 1986a). <br /> �a <br /> J <br /> A number -of soil borings have been drilled at the site to as <br /> a �= the level of assess <br /> petroleum hydrocarbon contamination in soils across <br /> the site. Soil S+ borings MW1-MW5 were completed as <br /> groundwatmonitoring weller I : <br /> E <br /> Ea�77rl ier...in_:.Januar <br /> ; Y 1986 GTI drilled and sampled six soil borings - <br /> (MWi , MW2, SBI-SB4, <br /> .� lected from the borfngsure and4scr 'tJndisturbed samples were. col <br /> screened at the surface with an HNU <br /> photaionization detector. No hy�,-irocarbans were detected in an <br /> f of the samples .usin <br /> Y . <br /> -� g this method. <br /> In December 1986, a soil boring (MW3) was drilled <br /> E the former tank .pit. Three soil samples from in the area of <br /> analyzed; they contained very low levels of benzeneboring were <br /> xylenes, and total toluene, <br /> � ? petroleum hydrocarbons (see Table 3). <br /> e42/71050/7-90/tx <br /> .t 4 <br /> rr . <br /> r, <br />