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Ms. Devra Lewis M June 7,2001 Page 9 3.4.2.3 Sample Custody Control Procedures All samples submitted to the analytical laboratory will be accompanied by a completed chain-of- custody(COC)form. The COC form will be used to document the handling and shipping procedures as well as identify and ensure traceability of the samples collected. The COC form will be completed and signed by the sample collector and subsequently signed through all custody transfers. At the analytical laboratory, the COC form will be checked for accuracy and completeness, and then signed and dated by the laboratory custodian accepting the samples. A separate COC form(s) will accompany each shipment of samples. If all of the samples in a given shipment cannot be recorded on a single COC form, an additional form(s) will be used. 3.5 TASK 5- INVESTIGATION DERIVED WASTE DISPOSAL Soil generated during the installation of the groundwater wells will be stockpiled on and covered with visqueen at a designated Site location. The soil stockpile will remain on-site pending receipt of soil analytical data from the laboratory for profiling purposes. Composite soil samples will be collected and analyzed for VOCs by EPA Method 8021B. The analytical results will be used for waste profiling and disposal evaluation. Water generated during the installation of the groundwater wells will be collected and recycled in the Pioneer plant for use as process water. 3.6 TASK 6-SUMMARY REPORT Upon completing Tasks 1 through 5, SECOR will prepare a Summary Report describing the methods for and results of the investigation. The Summary Report will include tabulated analytical data,figures depicting subsurface conditions including groundwater chemical analytical results, and appendices containing laboratory reports, permits, well construction logs, and other pertinent information. The Summary Report will also include conclusions and recommendations for further work, if warranted. 4.0 SCHEDULE SECOR proposes to initiate the described activities immediately following approval of the Work Plan by the RWQCB. We anticipate that the project will require approximately four to five months to complete following Work Plan approval. A proposed schedule for the groundwater investigation is included as Attachment A. As previously noted,the schedule is dependent upon obtaining access agreements. Based on previous experience with offsite landowners, we believe Task 1 will require at least two months to complete. Task 2 will require approximately 3 weeks to complete. Task 3 will require approximately two weeks to complete, and is dependent upon the availability of a drilling company. Task 6 will require approximately one month. The Summary Report will be submitted one month from receipt of final analytical results from the analytical laboratory. H:\Pioneer-Tracy\WorkPlan200l\workplan.doc SECOR Intemational Inc.