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DEL-TECH GEOTECHNICAL SUPPORT SERVICES,INC. <br /> (209)232-7907(OFFICE) CaeB&Mra@oNMl7 can (EMAIL) <br /> INSTRUMENT CALIBRATION LOG 2026 <br /> PRO4T('T NAME: CITY OF RIVERBANK WWIP PROJECT MANAGER: CITY OF RIVERBANK WWIP <br /> ADDRF,SS: 23865 SANTA FE ROAD SAMPLER: DEL-TECH/ANTOMO MORALES <br /> CITY,STATE: RIVERBANK,CA SIGNED: '`"("`-" * <br /> SITE CONTACT: DARIN SMALLEN SAMPLE MEDIA: PERIMETER GAS WELLS <br /> COW I T VN T: N/A DATE: 2/12/2026 <br /> CALIBRATION RECORDINGS <br /> CAL®RATION STANDARDS <br /> INS'IRUNHIN'I SERIAL CH4 CO2 N2 02 <br /> T DIE METER H 50% 35% BAI- ATMOSPHERE <br /> C:ALIBRA'IED READING READING READING READING <br /> 7:00 GEM 2000+ 108110 <br /> CH4 49.8 <br /> CO2 34.7 <br /> N NITROGEN I5.5 <br /> 02 <br /> GEM 2000+ 10800 <br /> CH4 <br /> CO2 <br /> N NITROGEN <br /> O' <br /> CALIBRATION STANDARDS " <br /> INSTRUMENT SERIAL ISOBUTYLENE <br /> TIME METER 0 GASSTANDARD <br /> CALIBRATED 100 PPM <br /> MINI RAE 3000 _ <br /> 11.7Ev Mm 592-901-1492 <br /> Isobutylene <br /> MINI RAE 3000 _ <br /> 11.7 Ev lamp 592-901-1492 <br /> Isobutylene <br /> MINI RAE 3000 <br /> 11.7 Ev lamp 592-901-1492 <br /> Isobutylene <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 />