Air, Water, Soil, Gas and more...
OIL - Methane Gas
According to California Department of Conservation (DOC), Geologic Energy Management Division (CalGEM) Southern District, no oil or gas wells are located on the Site; however, the Site is located within the Huntington Beach Oil Field. The closest oil well to the Site, API 0405901826/HKR #1, is located approximately 430 feet to the east of the Site. If methane gas is discovered in the soil, the following City Specification would be applicable and the grading, building, and methane plans must reference that the corresponding methane mitigation features will be installed. These can include a sub-slab methane barrier and vent system per City Specification # 429, Methane District Building Permit Requirements prior to plan approval.
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GAS - SOIL
PCE was detected in both soil gas samples analyzed at concentrations exceeding the commercial/industrial SGSL of 67 μg/m3 for PCE. In previous investigations, PCE has been detected above the commercial/industrial SGSL in many samples across the Site (Figure 4). The highest concentrations were reported in samples B33-25, B32-35’, and B32-45’ feet bgs which exceed 100,000 μg/m3. Based on the isoconcentration maps of PCE impacts to soil gas are delineated to the south, southwest, east, and northeast portions of the property (Figures 5 and 6). PCE concentrations increase in the northwest corner of the property where all reported concentrations exceed the commercial/industrial SGSL for PCE in the vicinity of the wood treatment operations. Concentrations appear to be highest in boring B32 and decrease in all directions. Concentrations are delineated to the southwest, south, and southwest to below the commercial/industrial SGSL in shallow soil vapor. In the northwest corner of the property, concentrations of PCE exceeded the commercial/industrial SGSL to the investigation depth of 45 feet bgs. Concentrations of PCE generally increase with depth to 25 or 35 feet bgs. In the four deep borings, concentrations decreased in the deepest sampled probe at 45 feet bgs. The breakdown product, TCE, has also been detected above the commercial/industrial SGSL in soil gas in the northwest corner of the property and follows a similar distribution as PCE. The XSD logs from the MIP tool indicate a similar decrease in XSD response in the lower portions of the logs (Appendix A).
READ the report https://cms3.revize.com/revize/huntingtonbeachca/Appendix_D-3_HRSC_Investigation_Report_FINAL_02_22_2024.pdf?t=202511061028520&t=202511061028520