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4.1 Vapor Monitoring 4.1.1 Oxygen and Carbon Dioxide Oxygen and carbon dioxide monitoring will occur weekly throughout the remediation project Samples will be collected using field instruments similar or identical to the instruments used during the pilot study Samples will be collected following procedures outlined in Section 3 3. 4.1.2 Organic Vapor � P IOrganic vapors (OV's) will be monitored using a photo-ionization detector (PID) The PID to be used is a Thermo Environmental 580A, calibrated to isobutylene These measurements will be collected at the same time (weekly) and using the same protocol as oxygen and carbon dioxide sample collection Additional description of the PID is contained in the FRP 4.1.2 Methane None of the strains of bacteria utilized in the inoculation have demonstrated the ability to I produce methane According to Mr Hoeltgen, methane can be produced only by specific bacteria, under strict anaerobic conditions, with a suitable substrate, temperature and moisture Presently, methane-producing conditions do not exist, conditions at the site are microaerophilic, and are unsuitable for methane production Bioremediation monitoring by GeoAudit at similar sites, using identical inoculum, have Ishown no methane production Oxygen and moisture will be provided at this site, preventing methane-producing conditions from forming Therefore, we see no need to collect samples for methane analysis Soil Monitoring 4.2 So g Bioremediation progress in the soil will be monitored by direct sampling via drilling of soil bonngs GeoAudit anticipates drilling two soil bonngs on a quarterly basis to determine the effectiveness of the bioremediation system However, the number and placement of the soil bonngs should be determined on a quarterly basis and may vary, but shall not be less than one or greater than three bonngs per quarter Placement of soil bonngs will be based upon data from the previous quarter The CVRWQCB will be notified at least 5 days in advance to any proposed drilling of soil bonngs Initially, GeoAudit proposes to drill one soil boring approximately 3 feet northeast of VW-7, which will receive inoculum during the full-scale inoculation, and one boring approximately 3 to 5 feet southeast of VW-4, which received inoculum during pilot study The first boring will provide "virgin" data for the full-scale inoculation, the second boring will confirm the remediation of hydrocarbons in the area of VW-4 as a result of the pilot study inoculation _S-1 A.&I s.— I.. 7 1 33,C3.wba h,,%-94 /