Laserfiche WebLink
Kennedy/Jenks Consultants <br /> 22 Field Investigation <br /> 2 2 1 Geophysical Survey <br /> Subdynamic Locating Services (Subdynamic) conducted a geophysical survey on 7 August <br /> 1996 in an attempt to locate the gasoline UST, buried utilities and other subsurface <br /> obstructions at the proposed locations of the two soil borings <br /> 2 2 2 Subsurface Soil Sampling <br /> Two soil borings (P13-1 and P13-2) were drilled at the Site to approximately 20 feet below <br /> ' ground surface (bgs) Spectrum Exploration Inc of Stockton, California performed the <br /> drilling operations using a hydraulic push/drive sampling system The locations of the sod <br /> borings are shown on Figure 1 <br /> ' Sod samples were collected approximately every 5 feet using a split-spoon sampler lined <br /> with acetate tubes The sod samples were collected in accordance with the procedures <br /> presented in the Work Plan, and are outlined in Appendix B Soil conditions in each <br /> ' borehole were recorded on boring logs which are presented in Appendix C <br /> 3 SOIL SAMPLE ANALYTICAL RESULTS <br /> ' From each boring (PB-1 and PB-2), the sod samples collected from the 19 5 to 20 0 feet <br /> below ground surface interval were submitted for the following analysis <br /> • Total petroleum hydrocarbons as gasoline (TPHg) using Modified EPA Method <br /> 8015 <br /> ' • Benzene, toluene, ethylbenzene and total xylenes (BTEX), methyl-tertiary-butyl- <br /> ether (MTBE) using EPA Methods 8020 <br /> Total lead using EPA Method 3050/7420 <br /> TPHg, BTEX, and MTBE were not detected above the respective laboratory detection limas <br /> in the sod samples submitted for analysis as presented on Table 1 Total lead was <br /> detected in sod samples PB-1 D and PB-2C at concentrations of 9 micrograms per kilogram <br /> (mg/kg) and 8 mg/kg, respectively These concentrations are well within the range of lead <br /> concentrations typically found in U S or Western U S sods (Shacklette and Boergen, <br /> ' 1984, and Lindsay, 1979) <br /> The analytical reports and chain-of-custody form for the soil samples submitted for analysis <br /> ' are presented in Appendix D <br /> 4 FINDING AND CONCLUSIONS <br /> ' • On the basis of the September 1996 sod investigation, Kennedy/Jenks presents the <br /> following findings and conclusions <br /> The analytical results of soil samples collected from Borings P13-1 and PB-2 indicate <br /> that TPHg, BTEX, and MTBE are not present above the laboratory detection limits <br /> in soils in the vicinity of the UST <br /> 1 i yobWft68070 011phase ulteAdoc 2 <br />