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DEL-TECH GEOTECHNICAL SUPPORT SERVICES,INC. <br /> (209)232-7967(OFFICE) C sanomgPeelle017 Imm (EMAIL) <br /> INSTRUMENT CALIBRATION LOG 2026 <br /> PRo4E('T NAME: CITY OF RIVERBANK WWPP PROJECT MANAGER: CITY OF RIVERBANK WWI? <br /> ADDREss: 23865 SANTA FE ROAD SAMPLER: DELTECH/ANTONIO MORALES <br /> CffY,SPATE: <br /> RIVERBANY,CA SIGNED: A.,-- ♦1 M.._1.— <br /> SITE CONTACT: DARIN SMALLEN SAMPLE MEDIA: PERIMETER GAS WELLS <br /> LOW TTAST: N/A DATE: 2/122026 <br /> CALIBRATION RECORDINGS <br /> CAG®RATION STANDARDS <br /> INS'I'RL'MENT SERIAL CH4 CO2 N2 02 <br /> TLME METER N 50% 35% RAL ATMOSPHERE <br /> C.\LIBRATED READING READING READING READING <br /> 7:00 GEM 2000+ 10800 <br /> CH4 49.8 <br /> CO2 34.7 <br /> N NITROGEN 15.5 <br /> 02 -'1 <br /> GEM 2000+ 10800 <br /> CH4 <br /> CO2 <br /> N NITROGEN <br /> 0' <br /> CALIBRATION STANDARDS " <br /> INSTRUMENT SERIAL ISOBUTYLENE <br /> TIME METER 9 GASSTANDARD <br /> CALIBRATED too PPM <br /> MINI RAE 3000 _ <br /> 11.7Ev Mm 592-901-1492 <br /> Isobutylene <br /> MIM RAE 3000 <br /> 11.7 Ev lamp 592-901-1492 <br /> Isobutylene <br /> MINI RAE 3000 <br /> 11.7 Ev lam 592-901-1492 <br /> Isobutylenc <br /> ' NOTE: UPON COMPLETING THE INITIAL READINGS OF THE INSTRUMENT WE WILL ALWAYS ADJUST TO THE <br /> INSTRUMENT TO THE CALIBRATION STANDARD SOLUTION THAT IS BEING USED AT THAT TIME AND AT THE <br /> CURRENT AMBIENT TEMPERATURE. <br />