SITE INFORMATION AND CORRESPONDENCE

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Clearly Establish Responsibility*Key Items Plan For Reductions n Scope Standard Operating Procedures and Site Records Due to changing site conditions and progress toward cleanup, reductions in the scope of work may be Contracts should clearly task the contractor with warranted during a contract. Therefore, well-written development and updates to an O&M manual that contracts should provide for potential reductions in provides fundamental information about the system and scope. The following are examples of areas where standard operating procedures. The contracts should scopes may be reduced during a long-term contract. also task the O&M contractors with maintaining site records and providing transition training for future Process monitoring: Substantial process monitoring O&M contractors. may be required, especially during"shakedown". However,when stable operation is achieved,process Evaluation of P&T System Performance monitoring can be reduced. O&M of a P&T system requires regular evaluation of Ground ivater sampling: During the first few years of the remedy's effectiveness. These evaluations need to operation, quarterly ground water monitoring may be consider performance of both the above-ground treatment processes and responses in the subsurface. Because many parties(site owner, state and federal Exhibit 10 regulators,contractors, and possibly subcontractors) Key Items to be Included in an O&M Report are involved in the O&M of a P&T system, the responsibility for evaluations should be clearly defined Subsurface performance and tasked to the O&M contractor in the O&M • ground water quality data and updated plume map(s) contract. • ground water elevations and updated potentiometric surface(s) • extraction well rates and specific capacities Evaluations can be divided into three components: concentrations at extraction wells • updated trend analyses • data collection • capture zone analysis • data analysis and interpretation • reporting Treatment plant performance • plant influent concentrations presented along side O&M contracts typically task the responsibility for data design influent concentrations plant effluent concentrations presented along side collection and reporting but may assume data analysis discharge criteria and interpretation is the responsibility of the site • plant flow rate and operational parameters(e.g., owners or regulators. In such cases, sufficient data head differentials across filters,air stripper air to analysis may not occur to monitor system effectiveness. water ratio,etc.) To avoid such situations, a contract should clearly task, • system efficiency along side design efficiency to the contractor, all data evaluation and analysis. • materials and utility use Further analysis could then be conducted by the site • maintenance items manager, if necessary. • identification and description of exceedances • system downtime Key items that should be included in a typical O&M Interpretation report are listed in Exhibit 10. are short-term goals being met? • are long-term goals expected to be met? Compare Lump Sum versus Cost Reimbursable • evidence of progress toward goals(trends in concentrations,etc.) Contracts should clearly delineate financial • revised site conceptual model responsibility. Example 5, on the following page, Other Significant O&MActivides provides summaries of two contracting options for • system modifications operation of the same P&T system. It illustrates that • non-routine maintenance and costs(e.g., well- lump sum is most effective for items that are highly rehabilitation) predictable while cost reimbursable is more effective • communication with neighbors or local/State for items that are more uncertain. Examples of items authorities that should be cost reimbursable are materials, utilities, • Other significant site activities and unexpected or emergency repairs or modifications. 17