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File No 20-3941-01 C01 kq KLEINFELDER <br /> August 20, 1996 <br /> r <br /> Soil samples were collected in every boring at depths of 2 feet bsg and at five foot intervals <br /> ' starting at a depth of 5 feet bsg for lithologic classification and quantitative field screening <br /> Lithologic classification were based on the Unified Soil Classification System (USCS) <br /> Additionally, soil samples were obtained for field screening with an organic vapor analyzer <br /> (OVA) The OVA measures ionizable compounds in air in parts per million by volume (ppmv) <br /> In the event that obvious field evidence of contamination is present in any of our borings, the <br /> boring were continued to a depth whereby the bottom two samples have no obvious field <br /> 1 evidence of contamination In the event that groundwater is encountered, a monitoring well was <br /> installed <br /> Generally the subsurface conditions encountered were as follows <br /> Approximate Generalized <br /> Intetval Soil Description <br /> 0 - 0 feet 2 to 3 inches/Asphalt Concrete pavement or silty sand, with or <br /> without line gravel <br /> 0 5 -20 feet Dat k brown to brown silty sands interbedded with poorly-graded <br /> sands and sandy silts, fine to medium grained Some well graded <br /> sands <br /> ' 20 - 55 Leet Brown sands, medium grained, well to poorly sorted, some silt <br /> For additional details regarding the subsurface conditions encountered, please refer to the logs of <br /> borings (Plates A-1 through A-18) in Appendix A <br /> 1 4.3 QUALITATIVE FIELD SCREENING <br /> To provide a qualitative indication of the presence of volatile organic constituents in the soil and <br /> to monitor the constituent concentrations in the breathing zone, a portable organic vapor <br /> analyzer was used to screen the samples in the field A Photovac MicroTip photo-ionization <br /> detector (PID) was used to measure total ionizable compounds in parts per million by volume <br /> (ppmv) of vapor <br /> Soil samples obtained were screened in the field, and the PID readings were recorded on the <br /> boring logs PID readings ranged from 0 to 1,600 ppmv Hydrocarbon odors were present only <br /> in some of the samples obtained from the Matt's Texaco site <br /> For the protection of the field crew, the PID was also used to measure the total ionizable <br /> concentration in the breathing zone prior to and while drilling the borings No consistent <br /> readings were noted in the breathing zone above 1 ppmv <br /> 20-3941-01 ,E011MR960163 Page 13 of 2J 01996 Kleinfelder, Inc <br />