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TABLE B3 Laboratory Results (Soil/Geoprobe) ' B T E X MTBE TPH-G TEPH Detection 50 50 50 50 50 10 10-10 ' Sample 1 D Limits µg/kg µg/kg 4Wkg µg/kg mg/kg µg/kg mg/kg 1432-GPI-9 ND ND ND ND ND ND ND 1432-GP2-11 ND ND ND ND ND ND 45 (motor oil range?) 1432-GP-3-l0 'SID ND ND ND 14 ND 39(motor oil range9) ' 1432-GP4-5 920 1,500 ND(]00) ND(100) 28 55(motor oil range'7) 1432-GP5-13 ND ND ND ND ND ND ND ' Unit Conversions Analytical µg/kg parts per billion(pph) 13TEX=benzene,toluene,ethyl benzene, and total xylenes mg/kg parts per million(ppm) MTBE—methyl tertiary butyl ether TPH-G=total petroleum hydrocarbons quantified as gasoline ' TEPH=total extractable petroleuin hydrocarbons quantified as diesel,motor oil and kerosene ND=none detected at or above laboratory detection limits (100)=detection limits raised due to gaso[me mterference ' (motor oil rang(?)=organics detected within the motor oil range however do not match the motor oil pattern TABLE 8.4 Chemical Analyses (Groundwater/Geoprobe) ' B T E X MTBE TPH-G TEPH Detection 03 0.3 0.3 0.6 10 005 005-0.5 Sample 1 D Limits µg/1 1,T/1 µg11 �tg/1 µg/1 µg/1 mg/l ' 1432-GPI-8129/96 ND 03 ND ND ND ND ND 1432-GP2-8129196 04 06 ND 06 ND ND ND ' 1432-GP4-8129196 69 600 66 400 1,300 27 ND 1432-GP5-8/29/96 ND ND ND ND ND ND ND ' Unit Conversions Aitialytical µg/1 parts per billion(ppb) BTEX=benzene toluene,ethyl benzene,and xylene mg/1 parts per million(ppm) MTBE=methyl ternary butyl ether t TPH-G—total petroleum hydrocarbons quantified as gasoline TEPH=total extractable petroleum hydrocarbons,quantified as diesel,motor oil, and kerosene ND=none detected at or above the reported laboratory detection limits ' Based on the results of the Geoprobe investigation, Condor recommended that monitor wells be installed at the site to investigate and monitor the lateral extent of the gasoline and diesel contamination plume (reference - Soil and Groundwater Investigation Report, prepared by Condor, dated September 30, 1996) Mr Ronald Rowe of the PHS/EHD approved the proposal for the monitor well installation m correspondence to Condor, dated February 6, 1997 Condor subsequently prepared the Work Pian for Monitor Well Installation, dated May 30, 1997 As described in Section 10 of tlus report, the Work Plan was approved by the PHS/EHD and the Reclamation District in July, 1997