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Off-Site Groundwater Well Installation Work Plan McBillin Real Estate Investment Property 2154 South El Dorado Street Stockton,San Joaquin County,California Page 7 SURVEYING Upon completion of the proposed monitoring well network, a land surveyor licensed by the California Department of Consumer Affairs,Board of Professional Engineers, Land Surveyors, and Geologists will be retained to survey the top-of-casing elevation for each newly installed monitoring well. The survey data set will be uploaded into the GeoTracker database as required by law. WASTE DISPOSAL All investigation derived waste (IDW) will be stored at the Site as described throughout this Workplan in metal 55-gallon drums. It is anticipated that the solids component of IDW will be limited to soil cuttings and excess grout from monitoring well construction. One (1) 4:1 composite soil sample will be collected from the drums containing soil to characterize the material for disposal. The specific analytical methods will be dictated by the proposed receiving facility at the time of generation. The liquid component of IDW is anticipated to be limited to well development water, equipment decontamination/rinsate water, and purge water associated with sampling the monitoring wells associated with the Site. All IDW will be transported and disposed of at an appropriate off- site facility under manifest. Documentation of the disposal will be included as an attachment in the follow-on Well Installation Report to be completed upon completion of all outlined above. SCHEDULE Upon approval of this Work plan by the CVRWQCB, Apex will immediately begin the permitting process described above as well as the other pre-field work activities described. Once the required permits have been obtained, Apex will retain the services of California C-57 licensed drilling contractor to begin the field component of the workplan as soon as possible. REPORTING Upon completion of the groundwater well installations,Apex will prepare a Well Installation Report documenting the results of all field activities and analytical results from samples collected from the newly installed groundwater monitoring wells. The report will include documentation of boring logs, monitoring well installation, monitoring well development, groundwater sampling, field screening, laboratory analysis, well completion reports, and waste disposal. MINOR ALTERATIONS TO WORKPLAN Apex may make minor alterations to the proposed well locations in response to findings such as but not limited to, a discovery of conflicts with existing structures, requirements of property owners, or as Apex may determine to be beneficial to its future activities in connection with the Site. Apex may may alter the proposed vertical dimensions of a boring or well as determined by the Professional Geologist or Professional Engineer that is in Responsible Charge of the drilling and well construction activities. The Responsible Professional may alter the boring or well design based on their interpretation of the hydrogeologic environment and their identification of hydrogeologic boundaries. Unless specifically prohibited by the Lead Regulatory Agency, Apex reserves the right