WORK PLANS - Laserfiche WebLink

Home Browse Search

KLEINFELDER File No. 20-3937-01 September 3, 1996 Soil samples were collected in every boring at five foot intervals starting at a depth of 5 feet bsg for lithologic classification and'quantitative field screening. Lithologic classification were based on the Unified Soil Classification System (USCS). Additionally, soil samples were obtained for field screening with an organic vapor analyzer (OVA). The OVA measures ionizable compounds in air in parts per million by volume(ppmv Generally the subsurface conditions encountered were as follows: Approximate Generalized Interval Soil Description 0 - 15 feet Brown, very stiff clayey silt 15 - 20 Feet Brown, dense silty sand 20 - 75 fleet Brown, very stiff clayey silt For additional details regarding the subsurface conditions encountered, please refer to the logs of borings (Plates A-1 through A-3)in Appendix A. 4.3 QUALITATIVE FIELD SCREENING To provide a qualitative indication of the presence of volatile organic constituents in the soil and to monitor the constituent concentrations in the breathing zone, a portable organic vapor analyzer was used to screen the samples in the field. A Photovac MicroTip� photo-ionization detector (PID) was used to measure total .ionizable compounds in parts per million by volume (ppmv) of vapor. Soil samples obtained were screened in the field, and the PID readings were recorded on the boring logs. PID readings ranged from 0 to approximately 5 ppmv. These concentrations appear to be consistent with background levels. Hydrocarbon odors were not present in any of our borings. For the protection of the field crew, the PID was also used to measure the total ionizable concentration in the breathing zone prior to .and while drilling the borings. No consistent readings were noted in the breathing zone above 1 ppmv. Upon completion of the drilling, the borings were converted into monitoring wells MW-1 through MW-3 (see Plate 1). Installation and construction details, and decontamination procedures are presented in Kleinfelder's Field Procedures (Appendix B). 20-3937-011MR960189 Page 8 of 18 01996, Kleinfelder, Inc.