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' h" KL ElNFELDER 4 GEOPROBE ASSESSMENT 4.1 PERMITTING AND PREFIELD ACTIVITIES Kleinfelder submitted a permit to PHS/EHD for a limited soil and groundwater assessment ' utilizing Geoprobe sampling methods (File number 20-YPO-307, dated October 6, 2000) Approved boring permits were obtained prior to initiating the field activities Underground Services Alert (USA) was contacted by the Geoprobe contractor prior to field activities For a ' copy of the well/boring permits and the PHS/EHD permit approval, please refer to Appendix E 4.2 FIELD ACTIVITIES ' On October 20 and 23, 2000, thirteen borings, GP-1 through GP-13, were advanced in the vicinity of the former UST (Plate 2) An experienced Kleinfelder field geologist directed the field activities, logged the borings, and collected the samples All activities were overseen by ' Mr Harlin Knoll of the San Joaquin County PHS/EHD At the direction of PHS/EHD, Geoprobe locations GP-12 and GP-13 were added based on field conditions encountered during the course of this assessment Three Geoprobes (GP-1, 2, and 9) were advanced within the ' former UST excavation area Five Geoprobes (GP-3 through GP-7) were advanced to the east and southeast of the former UST excavation and the remaining five Geoprobes (GP8, GP-10 through GP-13) were located to the north, northwest, and west of the former UST excavation Due to an elevated PID reading in GP-12 the final geoprobe location (GP-13) was located to the northwest of GP-12 (approximately 10 feet to the north and 10 feet to the west) in an attempt to ' evaluate the horizontal extent of hydrocarbons Please refer to Plate 2 for locations The thirteen Geoprobes were advanced to approximate total depths ranging between 12 and 18 ' feet below ground surface (bgs) Groundwater was encountered between 10 and 16 feet bgs The Geoprobe borings were pneumatically advanced using a 4-foot steel core barrel Soil samples were continuously collected by inserting a four-foot acetate liner into the probe prior to ' each drive Soil samples obtained for potential chemical analysis were collected at desired intervals by removing the acetate liner and cutting out the desired 6-inch interval Samples submitted for analysis were collected above groundwater at depths ranging within the top five ' feet of the probe to 8 to 10 feet bgs The soil samples were sealed with Teflon® film and plastic end caps ' During the advancement of the push probes, Kleinfeider collected soil samples for lithologic logging purposes, field screening and potential chemical analysis The soil samples collected were field screened using a photo-ionization detector as described in Appendix A, Section A-2 2 iPhoto-ionization detector (PID) readings were recorded on the boring logs and ranged from 0 parts per million by volume (ppmv) to 65 ppmv (GP-12 at 4-foot interval) 20-2322-05 E0 1/2011 806 1 Page 5 of 14 Copyright 2001,Kleinfelder,Inc January 12,2001