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Administrative Draft Environmental Impact Report Gill Medical Center Project Timing/Implementation: Prior to Construction Monitoring/Enforcement: County of San Joaquin Planning/Development Services Division Impact 4.11-2: The Project could create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment. Impact Determination: less than significant with mitigation incorporated Threshold: Creation of a significant hazard to the public or the environment due to upset or accident conditions. CaIGEM oversees the drilling, operation, maintenance, and plugging and abandonment of oil, natural gas and geothermal wells. In their NOP comment letter (Appendix A), CaIGEM indicates that a gas well, referred to as the "North Stockton Unit A" 1 well (API: 0407700519), exists on the Project site and was converted to a water well in July of 1962. As shown in Figure 3-7, this well is located in the central portion of the site within the southwest corner of the Phase 2 Main Hospital building footprint. CaIGEM does not make any statements in their comment letter relative to the adequacy of abandonment procedures for this well with respect to current standards. However, according to CaIGEM, significant and dangerous issues may be associated with development near oil and gas wells. For example, nothing guarantees that a well abandoned to current standards will not start leaking oil, gas, and/or water in the future. It always remains a possibility that any well may start to leak oil, gas, and/or water after abandonment, no matter how thoroughly the well was plugged and abandoned. CaIGEM acknowledges that wells abandoned to current standards have a lower probability of leaking oil, gas, and/or water in the future, but makes no guarantees as to the adequacy of the onsite well's abandonment with respect to current standards or the potential need for future re-abandonment. In their NOP comment letter, CaIGEM provides the following comments/guidance solely to facilitate decisions made by the local permitting agency, in conjunction with the property owner and/or developer, for development near a gas well. 1. It is recommended that access to a well located on the property be maintained in the event abandonment of the well becomes necessary in the future. Impeding access to a well could result in the need to remove any structure or obstacle that prevents or impedes access. This includes, but is not limited to, buildings, housing, fencing, landscaping, trees,pools,patios, sidewalks, and decking. 2. Nothing guarantees that a well abandoned to current standards will not start leaking oil, gas, and/or water after abandonment, no matter how thoroughly the well was plugged and abandoned. CaIGEM acknowledges that wells abandoned to current standards have a lower probability of leaking oil, gas, and/or water in the future, but makes no guarantees as to the adequacy of this well's abandonment or the potential need for future re- abandonment. 3. Based on comment 1 and 2 above, CaIGEM makes the following general recommendations: a. Maintain physical access to any gas well encountered. Noise 4.11-7 October 2021