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REVISED MONITORING AND REPORTING PROGRAM NO. 93-701 - 2 - <br /> GEWEKE LAND DEVELOPMENT AND MARKETING <br /> SAN JOAQUIN COUNTY <br /> CO2 <br /> BOD <br /> Annual sampling events will occur during the first calendar quarter. If any well is dry <br /> during the normally scheduled annual sampling event, then ground water will be collected for <br /> analysis during the following quarter sampling event when ground water is present. <br /> All constituents and peaks are to be reported. <br /> If no constituents are detected in the first two sample analyses for lead and <br /> ethylenedibromide, these analyses may be deleted from the monitoring program, at the <br /> discretion of the Board. <br /> SOIL GAS/VAPOR MONITORING <br /> The existing soil gas/vapor monitoring network consists of the ground water monitoring <br /> network listed above and seven vapor wells, VWl through VW7. Gases and vapors shall be <br /> monitored in all existing ground water monitoring, injection, and/or extraction wells and all <br /> air/vapor monitoring, injection, and/or extraction wells. Failure to detect gases/vapors, <br /> which indicate bacterial growth, in the outlying monitoring points (existing wells EWI, <br /> MW2, MW6, MW7, MW8, MW9, MW10, MWII, MW12, and MW13) will initiate <br /> construction of new vapor monitoring points. The new monitoring points will be located <br /> between points of vapor/gas detection and points where no vapors/gases are detected. After <br /> construction, all new wells and monitoring points will be included in the monitoring <br /> program. <br /> Gas/vapor samples will be collected from at least one point that is not used to inject air or <br /> bacteria into the subsurface and is near the source of the contamination. Samples will be <br /> collected twice monthly for the first six months following inoculation of the bacterial <br /> consortia, monthly for the subsequent six months, and thereafter as follows: <br /> Sampling Analytical <br /> Constituents Units Tyne of Sample Frequency Method <br /> Oxygen Gas (02) % Summa Cannister/Tedlar Bag Quarterly ASTM D-3416 <br /> Carbon Dioxide (CO2) % Summa Cannister/Tedlar Bag Quarterly ASTM D-3416 <br /> Methane (CH4) % Summa Cannister/Tedlar Bag Quarterly ASTM D-3416 <br /> Nitrogen Gas (NZ) % Summa Cannister/Tedlar Bag Quarterly ASTM D-3416 <br /> Hydrocarbon Vapors mg/cucm Summa Cannister/Tedlar Bag Quarterly EPA TO-14 <br />