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DEL,-TECH GEOTECHNICAL SUPPORT SERVICES,INC. <br /> (209)232-7967 (OFFICE) cassandra@deltechl.com (EMAIL) <br /> INSTRUMENT CALIBRATION LOG 2026 <br /> PROJECT NAME: CITY OF RIVERBANK W WTP PROJECT MANAGER: CITY OF RIVERBANK W WTP <br /> ADDRESS: 23865 SANTA FE ROAD SAMPLER: DEL-TECH/ANTONIO MORALES <br /> CITY,STATE: RIVERBANK,CA SIGNED: 4,'"'' -' p"'_/_ <br /> SITE CONTACT: DARIN SMALLEN SAMPLE MEDIA: PERIMETER GAS WELLS <br /> CONSULTANT: N/A DATE: 6/16/2026 <br /> CALIBRATION RECORDINGS <br /> CALIBRATION STANDARDS <br /> INSTRUMENT SERIAL CH4 CO2 N2 02 <br /> TIME METER # 50% 35% BAL. ATMOSPHERE <br /> CALIBRATED READING READING READING READING <br /> 7:00 GEM 2000+ 10800 <br /> CH4 49.8 <br /> CO2 34.9 <br /> N NITROGEN 15.3 <br /> 02 21 <br /> GEM 2000+ 10800 <br /> CH4 <br /> CO2 <br /> N NITROGEN <br /> 02 <br /> CALIBRATION STANDARDS <br /> INSTRUMENT SERIAL ISOBUTYLENE <br /> TIME METER # GASSTANDARD <br /> CALIBRATED 100 PPM <br /> MINI RAE 3000 <br /> 11.7 Ev lamp 592-901-1492 LM <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 />