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
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<br /> �e� CONDOR
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