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Soll and Groundwater Investigation R2ep rt—�—� <br /> 730 E Channel Street,Stockton,CA <br /> June 1,2004 <br /> Page 3 <br /> a� Geological logs were prepared containing field observations including soil type, PID measurements, and <br /> the presence of staining or odor The geological logs are Included in Appendix B Soil samples were <br /> collected from the borings for laboratory analyses based on field observations and,PID measurements <br /> Two soil samples were collected from boring SB-1, and three soil samples were collected from each of <br /> borings S13-2, SB-3, SB-4, S13-5, and SB-6 for laboratory analyses The soil cuttings were placed in a 55- <br /> gallon drum, sealed, labeled, and left on-site to await disposal pending results of the laboratory analyses <br /> Each soil sample collected for laboratory analyses was cut from the liners The soil samples were <br /> retained, undisturbed, in the liners The liners were sealed at the ends with Teflon® sheeting, capped, and <br /> labeled The samples were placed In a cooler chilled with ice and delivered under chain-of-custody <br /> procedures to Argon Laboratories (Argon) in Ceres, California, for analyses The samples were analyzed <br />�I using U S EPA Methods and California-approved methods <br /> 3 2 2 Groundwater Sampling <br /> One groundwater sample was collected from each boring for laboratory analyses Temporary 3/4-inch <br /> outside diameter PVC screen was placed into each boring for the collection of groundwater samples <br /> Groundwater flowed hydrostatically from the formation into the temporary PVC screen A groundwater <br /> sample was retrieved from within the screen with a stainless steel bailer The groundwater samples were <br /> gently poured from the bailer into laboratory supplied sample containers The sample containers were <br /> sealed, labeled, placed in a cooler chilled with Ice, and delivered under chain-of-custody procedures to <br /> Argon for analyses The samples were analyzed using U S EPA Methods and California-approved <br /> methods The groundwater sampling equipment was cleaned prior to collecting the samples using <br /> laboratory-grade, non-phosphate detergent and deionized water and double rinsed with deionized water <br /> • 33 LABORATORY ANALYSES <br /> The soil and groundwater samples collected from the borings were analyzed for TPH-G, TEPH-D, TEPH- <br /> MO, and total extractable petroleum hydrocarbons quantified as kerosene (TEPH-K) by EPA Method <br /> 8015B, and for BTEX and selected gasoline oxygenates/additives by EPA Method 8260B The selected <br /> gasoline additives/oxygenates include methanol, ethanol, tertiary-butanol (TBA), methyl tertiary-butyl <br /> ether (MTBE), di-isopropyl_ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether <br /> (TAME), 1,2-dichloroethane (1,2-DCA), and EDS The soil samples were analyzed for total lead by EPA <br /> Method 7420 The groundwater samples were analyzed for total lead by EPA Method 200 9 <br /> 4.0 INVESTIGATION RESULTS <br /> The results of the soil and groundwater investigation include field observations and laboratory analytical <br /> results for the soil and groundwater samples <br /> 41 FIELD OBSERVATIONS <br /> Field observations Included direct push boring observations, PID screening results, detection of sample <br /> odors, and visual observations of the site geology Field observations are included on the geological logs <br /> prepared for the borings (Appendix B) _ <br /> Soils encountered in the upper 25 to 30 feet of all the borings were predominantly clays and silts Soils <br /> encountered below 30 feet were interbedded sands, silts, and clays PID measurements of soil samples <br /> collected from the borings indicated organic vapors were detected in concentrations up to 0 9 parts per <br /> . million (ppm) in SB-1, 128 ppm in SB-2, 742 ppm in SB-3, 429 ppm in SB-4, 9 8 ppm in SB-5, and 13 <br /> 1 <br /> �e� CONDOR <br />