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Soilµand Groundwater]nvesttgation Report 730 E Channel Street,Stockton,CA June 1,2004 Page 6 �. Table 2 Groundwater Sample La oratory Analytical Results I Sample I D Sample B T E X TPH-G D K MO AddiOxygenates/ Lead Date (µg/L) (µg/L) (µg/L) (�tg/L) (�tg/L) (pg/L) (µg/L) (}ig/L) ( tivtives (mg/L) 3849C-SBI-5/5104 515/04 <0 5 <0 5 <0 5 < 1 0 <50 1 <50 <50 <250 <0 5 —<50 053 3849C-SB2-5/5/04 5/5/04 <0 5 <0 5 <0 5 < 10 58� 120 <50 <250 <0 5 —<50 0 075 3849C-SB3-5/5/04 5/5/04 <0 5 <0 5 11 14 590 1,200 < 100 <250 <0 5—<50 021 I 3849C-SB4-5/5/04 5/5/04 <0 5 <0 5 <0 5 < 10 170 360 <50 <250 <0 5—<50 011 - 3849C-SB5-5/6/04 5/6/04 <0 5 <0 5 <0 5 < 10 < 50 <50 <50 <250 <0 5--<50 048 3849C-SB6-5/6/04 5/6/04 1 <05 <0 5 1 <0 5_L-< 10 < 50 I <50 I <50 <2501<05—<50 1 1 f Unit Conversions Analytical I µg/L=micrograms per liter(ppb) B,T,E,X=benzene,toluene,ethyl benzene,total xylenes TPH-G=total petroleum hydrocarbons,quantified as gasoline D=total extractable petroleum hydrocarbons,quantified as diesel K=total extractable petroleum hydrocarbons,quantified as kerosene MO=total extractable petroleum hydrocarbons,quantified as motor oil Oxygenates/additives=methanol ethanol tertiary-butanol(TBA),methyl terttary- butyl ether(MTBE), di-isopropyl ether(DIPS), ethyl tertiary-butyl ether(ETBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), 1,2- dtbromoethane(EDB) _ 5.0 DISCUSSION Laboratory analytical results Indicate that the soil and groundwater at the site have been impacted by TPH-G and TEPH-D No petroleum hydrocarbons were detected at or above the laboratory reported detection limits in the three soil samples and the groundwater sample collected from boring SB-5, which was advanced adjacent to the former UST excavation This suggests there has been minimal impact to soil and groundwater in the vicinity of the former UST location The greatest impact to soil and groundwater is in the vicinity of the former piping and dispenser The soil under the building in the vicinity of the former dispenser location is probably impacted by petroleum hydrocarbons, and the groundwater contaminant plume probably extends under the building 6.0 RECOMMENDATIONS Condor recommends the preparation of a work plan for the installation of three groundwater monitor - - wells Condor also recommends initiating quarterly groundwater monitonng after the monitor wells are ' installed to monitor the concentration of petroleum hydrocarbons in groundwater and the groundwater gradient at the site 7 0 LIMITATIONS Condor has endeavored to determine as much as practical about the site within our scope of services using accepted principles and professional practice at the time the work was perfon-ned Condor makes no - representation as to the subsurface conditions at locations or times other than those sampled by our employees and reported in this document Condor is not responsible for the accuracy and completeness of information collected and developed by others I I �sC� CONDOR