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'I <br /> i <br /> KEI-J90-0611.R1 <br /> September 24 , 1990 <br /> i Page 3 <br /> 1 <br /> ranging from 130 ppb to 5, 600 ppb. Detectable EPA 8010 and 8270 <br /> constituents and their respective concentrations are summarized <br /> in Table 1. Metals concentrations are also summarized in Table <br /> r <br /> 1. Results of the soil analyses are summarized in Table 1. <br /> Copies of the laboratory analyses and the Chain of Custody <br /> documentation are attached to this report. <br /> DISCUSSION AND RECOMMENDATIONS <br /> Based on the analytical results and in accordance with the <br /> guidelines established by the RWQCB, further work is necessary at <br /> the site because of the level of contamination found in the soil. <br /> i To comply with the requirements of the RWQCB and the San Joaquin <br /> County Public Health Services, KEI recommends that additional <br /> i excavation be performed in the vicinity of the waste oil -tank <br /> pit. This excavation should be performed in conjunction with the <br /> removal of the existing underground fuel storage tanks currently <br /> scheduled for the first quarter of 1991. A work plan for the <br /> additional excavation will be prepared upon removal of the fuel <br /> tanks and evaluation of the required initial soil samples. For <br /> safety, and as discussed with Ms. Margaret Lagorio of the San <br /> Joaquin County Public Health Services, the waste oil tank pit . can <br /> g be backfilled at: this time. <br /> DISTRIBUTION <br /> A copy of this report should be sent to Ms. Margaret Lagorio of <br /> the San Joaquin County Public Health Services, and to the RWQCB, <br /> Central Valley Region. <br /> j LIMITATIONS <br /> I Soil deposits and rock formations may vary in thickness, lithol <br /> ogy, saturation, strength and other properties across any site. <br /> In addition, environmental changes, either naturally-occurring or <br /> artificially-induced, may cause changes in the extent and <br /> concentration of any contaminants. Our studies assume that the <br /> field and laboratory data are reasonably representative of the <br /> site as a whole, and assume that subsurface conditions ' are <br /> i reasonably conducive to .interpolation and extrapolation. <br /> The results of this study are based on the data obtained from the <br /> field and laboratory analyses obtained from. a state certified <br /> laboratory. We have analyzed this data using what we believe to <br />{ be currently applicable engineering techniques and principles in <br /> l the Northern California, region. We make no warranty, either <br /> expressed or implied, regarding the above, including laboratory i <br /> analyses, except that our services have been performed in <br /> a <br />