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_ml gg RN #� KLEINFELDER During the drilling, p g, an experienced environmental geologist classified the Fk ] r• subsurface soil and logged the boreholes. A copy of the Unified Soil Classification System (used to identify the soil) is included as Plate 6 (Appendix A). Descriptions of the soil encountered in each boring, and identification of the sample depth are presented on the Logs of Borings, `Plates 7 through 9 (Appendix A). ,Soil encountered in the borings was predominantly a silty clay and clay with traces of fine sand lenses. 3.2 QUALITATI6'E FIELD SCREENING fs.o To provide a qualitative indication of contamination, a portable organ;, vapor detector was used in the field to screen soil samples. A Photcivac TIP photoionization detector (PID) utilizing a 10.6 eV photoionization P � ,ra lamp was used to measure total ionizable compounds in parts per million by volume (ppmv) relative to a 100art p per million isobutylene calibration standard.. � Positive PID readings were not recorded from any of the samples screened i i., from the borings. Based on thelack of positive PTD readings, soil U. FA samples were not submitted.from chemical analysis. For the .. . - protection of the :field crew, the PID was also.used to measure the '- l totavolatile concentrations in the breathing zone g Prior to and during the drilling of the borings. No volatile concentrations were detected above 1 ppmv in the breathing zone. (� 93 MONITORING WELL INSTALLATION Whale drilling, ground water was present in the open excavation and Mme- encountered in the--.borings at--- approximately 7. feet: ach boring was advanced :26.5. ,feet below the. ground surface: Ground water monitoring' -� , wells MW-1 . through MW-3 were constructed in :borings B-1 through B-3, the f locations of the ' monitoring wells are shown on Plate 2 (Monitoring Well ` Location Map). f �e --88-502 97 4 r