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TABLE 1: LABORATORY ANALYSIS RESULTS FROM TANK EXCAVATION <br /> AND PIPE TRENCH SOIL SAMPLING AT THE CORPORATION YARD <br /> STOCKTON UNIFIED SCHOOL DISTRICT <br /> HLI 0089002 <br /> Sample Date Location' Depth TEPH Benzene Toluene Ethylbenzene Xylenes Chlorinatedc Semi,d OVAe <br /> collected (ft) (mg/Kg) (Ug/Kg) (ug/Kg) (ug/Kg) (ug/Kg) Hydrocarbons Volatile Reading <br /> Q (ug/Kg) Organics (Pp►m) <br /> (ug/Kg) <br /> 059 1/14/91 Center of Tank-#/ 10 NA <1 1 <1 10 NO NA NA <br /> 060 1/14/91 Center of Tank #4 10 <1 <1 <1 <1 <1 NA NA NA <br /> 061 1/14/91 Piping - Tanks #4 4 53 <1 <1 <1 <1 NO NA NA <br /> and4 Combined <br /> 062/063 1/14/91 West Si a of Tank #8 11 <1 <1 <1 <1 <1 NO NO NA <br /> 064/065 1/14/91 East Side of Tank #8 11 <1 <7 <1 <1 <1 NO NO NA <br /> 066 1/15/91 Remote Fill #1 4 17 <50 70'. ,760 <br /> 7700 NA NA NA <br /> 067 1/15/91 Remote Fill #2 4.5 <1 <1 <7 <1 <1 NA NA NA <br /> 068 1/15/91 Remote Fill #3 4.5 1400 <1 <1 <1 <1 NA NA NA <br /> 069 1/15/91 Remote Fill #4 5.5 5200 <5 <5 <5 <5 NA NA <br /> Sample Date Location' Depthb Total Cadmium Lead Nickel Zinc — — — <br /> Collected (ft) Chromium (mg/1) (mg/1) (mg/1) (mg/1) <br /> (mg/1) <br /> 062 1/14/91 West Side of Tank #8 11 <0.1 <0.05 <0.5 0.12 0.49 -- -- -- <br /> 063 1/14/91 West Side of Tank #8 11 <0.1 <0.05 <0.5 0.18 1.9 -- -- <br /> 064Il <br /> /14/91 East Side of Tank #8 11 <0.1 <0.05 <0.5 0.11 0.41 -- -- -- <br /> 065 /14/91 East Side of Tank #8 11 <0.1 <0.05 <0.5 0.15 2.5 -- -- -- <br /> a. Refer to Figures 1, 2, 3 and 4 for approximate locations of tanks and sample locations. Tanks No. 4 is a 500-gallon diesel tank, Tank No. 5 is a <br /> 500-gallon solvent tank, Tank No. 8 is a 1000-gallon waste ail tank. <br /> b. Depth below existing ground surface at time of sampling. <br /> c. Clorinated hydrocarbons by EPA Method 8010. Detection limits for all constituents is 1 um/Kg. <br /> d. Semi-Volatile Organics by EPA Method 8270. Detection limits for constituents vary between 330 and 1600 ug/Kg. <br /> e. Concentration in container headspace as measured in the field with a Porta-FID portable OVA equipped with a flame ionization detector. Concentrations <br /> are expressed in parts per million (ppm) by volume as methane equivalent. <br /> TEPH = Semivolatile Petroleum Hydrocarbons diesel fuel standards <br /> TPH-G = Total Petroleum Hydrocarbons as gasoline <br /> NA = Not Analyzed <br /> "<" = Laboratory Limit of Detection <br />