COMPLIANCE INFO_FILE 1 - Laserfiche WebLink

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Depth to the top of the sandstone is approximately 2,700 feet. The Domengine Formation is composed of poorly sorted, fine to coarse-grained, massive sand interbedded with shale. The bed dips and thickens rapidly to the southwest. This unit is present in all the seventy six well logs studied within a six-mile radius of the site. Also, the seismic data confirms that the formation is con- tinuous. The injection zone represents a marine environ- ment transition zone. The net sand thickness at the proposed well location is expected to be at least 250 feet. Hydrologic parameter data for the injection zone in the im- mediate vicinity of the well site are not known at this time. Data from nearby gas fields and California Division of Oil and Gas published reports indicate permeability and porosity ranges from 15 to 2812 millidarcy (md) and 18 to 38 percent respectively. The permeability of the Domengine Formation at the proposed site is expected to be 240 and and the porosity is expected to be 25 percent. These assump- tions may be conservative. Because the site is down dip from the producing gas fields to the north, it is expected that the Domengine Formation is fully saturated with water at the proposed location. The Nortonville Formation of Late Eocene age immediately overlies the proposed injection zone and forms a confining layer to vertical flow. This unit is approximately 300 feet thick in the study area and the top is expected at ap- proximately 2375 feet below the surface. The Nortonville Shale is a thin bedded shale interbedded with siltstone. Diatomaceous and Radiolarian shales are also present in this unit. This marine shale is easily recognizable and correlatable in all the well logs in the vicinity. There- fore, this unit is continuous throughout the study area. Actual hydrologic parameter data of this confining zone in the immediate vicinity of the well site does not exist at this time. However, from published data it is expected that the permeability will be less than 0. 01 md, typical of marine shales. Porosities may vary, but the majority of the voids are not interconnected, resulting in no fluid movement. ��.�. 2 . PRETREATMENT PRIOR TO INJECTION Process plant waste water will be collected at the raw waste water pump station. Then it will be pumped to the existing preliminary treatment facilities, which include a fine rotary screen (0.020 inch openings) to remove coarse particles, followed by a dissolved air floatation (DAF) unit for removal of fat, oil and grease, and total suspended solids (TSS) . Following this treatment, the waste water will be further treated by a new, activated sludge treatment facility. DAF effluent will be discharged to an equalization basin. The equalization basin will serve to regulate the flow into the activated sludge 4