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Work Plan for Groundwater Monitoring Well Installation, Soil Gas and Groundwater Investigation, and Groundwater Monitoring Army Aviation Support Facility, Stockton, California Laboratory analyses will be used to complete the waste profiles submitted to the disposal facility. Upon disposal facility approval of the waste profiles, the drums will be transported off site by a licensed waste hauler and disposed of at an approved, licensed disposal facility. 4.0 REPORTING Results from groundwater monitoring well installation, initial groundwater monitoring, and grab groundwater and soil gas sampling, as described in this Work Plan, will be documented in a report to be submitted to the CVRWQCB. Subsequent groundwater monitoring reports will be submitted to the CVRWQCB on a quarterly basis. The approximate schedule for submittal of the reports is addressed below and will be dependent upon when this Work Plan is approved by the CVRWQCB and when activities described herein are implemented. All reports will be reviewed and stamped by a California-registered Professional Geologist (PG) or Professional Engineer (PE). Additionally, all reports will be uploaded to the Geo Tracker system, as required. 4.1 COMBINED SITE INVESTIGATION REPORT Investigation methodologies, findings, and conclusions associated with groundwater monitoring well installation, first quarterly groundwater gauging and sampling, grab groundwater sampling, and soil gas sampling will be presented in a combined report for CVRWQCB review, The report will include tabulated chemical data for soil, groundwater, and soil gas samples, and contour maps for groundwater elevations and chemical data, as appropriate to findings. Soil boring/monitoring well completion logs, monitoring well development/purge/sample logs, COC documentation, laboratory analytical reports, and other associated field notes/documentation will be included as appendices to the report. As appropriate to findings and conclusions associated with the investigation, recommendations for follow-up investigation, as appropriate, will be addressed. 4.2 QUARTERLY GROUNDWATER MONITORING REPORTS The proposed reporting program includes the preparation of quarterly groundwater monitoring reports. As described above, the first quarterly monitoring event will be performed in conjunction with groundwater monitoring well installation and investigation of ground water and soil gas associated with the AASF wash racks, and groundwater monitoring results associated with the three existing and two proposed groundwater monitoring wells (i.e., the first quarterly event) will be presented in a combined investigation report. Two subsequent groundwater monitoring reports will be submitted to the CVRWQCB, approximately 3 and 6 months following submittal of the combined investigation report. Consistent with the reporting format described above, the quarterly reports will include a tabulation of groundwater analytical data for all wells and site maps depicting the locations of monitoring wells, analytical results for groundwater samples (contoured, as appropriate), and contoured groundwater elevations indicating the direction and magnitude of groundwater flow. Monitoring well purge/sample logs, COC documentation, and groundwater analytical reports will be included as appendices. The reports will detail the respective groundwater monitoring events, findings associated with them, and any problems or concerns that arose during sampling activities. As appropriate, recommendations for follow-up activities pertinent to quarterly findings will be included in the reports. 4.3 FOURTH QUARTERLY GROUNDWATER MONITORING REPORT Following completion of the fourth quarterly groundwater monitoring event, a report summarizing the four quarterly monitoring events and related findings will be prepared and submitted to the CVRWQCB for review. The report will provide a thorough assessment of data from the four events, including a comparison of quarterly results for both groundwater chemistry OTI E 15