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.� for indicator parameters, it may be appropriate to increase or decrease the number of wells for subsequent sampling It is intended that this sampling would be performed simultaneously with sampling already being conducted for dissolved contaminants. If dissolved contaminants are currently sampled quarterly, the biological indicator parameters should be sampled at the same frequency for one year Similar to the evaluation of contaminant concentration trends, it is useful to understand the influence of groundwater elevation on the indicator parameters. Upon evaluating the results of the initial monitoring event, it may be appropriate to discontinue certain indicator parameters. It may also be useful to include additional constituents, not shown in the above list, in subsequent monitoring. For example, methane and carbon dioxide, which do not occur in the list, may be included in this type of sampling program. Inclusion of methane and carbon dioxide is dependent on the availability of field instruments and the types of analytical methods performed by the laboratory. Section HI presents the sampling protocol and field/lab analytical methods for those indicator parameters not typically included in historical sampling programs. Considerable emphasis is given to dissolved oxygen, oxidation-reduction potential, and ferrous iron, because these rparameters are particularly sensitive to monitoring well purging and sampling techniques Section IV includes two case histones which illustrate a number of techniques which may be . used to evaluate field and laboratory data. This section includes graphs of biological indicator data and dissolved phase hydrocarbons There is no cost data provided in this protocol. The laboratory analytical costs for constituents such as ferrous iron, nitrate, and sulfate should be$10 to $20 per constituent per sampling event. Proper field sampling techniques for parameters such as dissolved oxygen and ferrous iron (field filtering) require a more labor intensive effort. Therefore, the incremental costs associated with field sampling for the indicator parameters will likely be at least as much as the laboratory analytical costs. - Finally, a glossary of definitions for commonly used analytical methods and a list of references appears at the end the document. The draft "Technical Protocol for Implementing Intrinsic Remediation", developed for the Air Force Center for Environmental Excellence (AFCEE), was particularly helpful in writing this Protocol. 2