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Geosyntec° <br /> consultants <br /> Surveying, a California-licensed surveyor. Vertical coordinates will be surveyed using <br /> NAVD88 datum and vertical survey data will have precision of at least 0.01 foot. <br /> 4.3.3 Monitoring Well Development <br /> Once installed, the grout seal will be allowed to cure for at least 48 hours prior to well <br /> development. Well development will be performed by the C-57 licensed drilling contractor <br /> (PeneCore Drilling) under the supervision of Geosyntec field staff. Development will consist <br /> of a combination of bailing,surging,and pumping to stabilize the filter pack and remove fines <br /> from the filter pack and well screen. Groundwater quality parameters (temperature, pH, <br /> specific conductance, dissolved oxygen, oxidation-reduction potential, and turbidity) will be <br /> measured during well development and recorded by Geosyntec field staff. Development will <br /> continue until turbidity measurements are either less than approximately 50 nephelometric <br /> turbidity units (NTUs) or are above 50 NTUs but turbidity and other groundwater quality <br /> parameters have stabilized despite ongoing development. <br /> 4.4 Waste Management and Equipment Cleaning <br /> All equipment will be decontaminated prior to drilling at each location and before <br /> demobilization following completion of drilling activities.All drill cuttings,well development <br /> water,and decontamination fluids will be transferred to new 55-gallon steel drums and stored <br /> in a designated on-Site area identified by Geosyntec staff for off-Site disposal in accordance <br /> with applicable state and local regulations. <br /> 4.5 Health and Safety <br /> Geosyntec has prepared a health and safety plan in the form of a THA for the field activities <br /> described herein. A copy is contained in Appendix A. The THA contains procedures for <br /> hazard identification and mitigation, emergency response including a map of the nearest <br /> hospital and emergency contact information, incident reporting, use of appropriate personal <br /> protective equipment (PPE), and air monitoring procedures. All field activities will be <br /> performed in accordance with the THA. <br /> Prior to the start of field activities each day, a safety tailgate meeting will be conducted and <br /> documented that will include a discussion of the field activities to be performed, safe work <br /> practices, identification of potential hazards, use of PPE, decontamination procedures, and <br /> emergency response protocols. <br /> OxyChem-Stockton MW Replacement Work Plan 7.18.25 6 2025.07.18 <br />