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— A �?E�:. ,,' � � -� �; :.Y. "`! •tea '�. ny <br /> w <br /> .s <br /> 19 <br /> 3.3.3.3 Permitting <br /> Authority to construct the air emission control system will be obtained from the San Joaquin <br /> County Air Pollution Control District. A source test will then be conducted to verily system performance, <br /> T and a permit to operate will then be issued. The discharge limits are set using risk-based parameters. <br /> The proposed treatment system will reduce (he observed influent concentrations to effluent levels <br /> acceptable to the agency. <br /> 3.4 Groundwater Extraction <br /> 3.4.1 Recovery Well Location and Installation <br /> The cross sections constructed for the site(Figur s 3 and 4)Indicate that a laterally continuous, <br /> hydrocarbon-impacted water-bearing zone consisting of sands and silty sands is encountered at <br /> approximately 29 feet BGS. Tne upper sand zone, from grade to 25 feet BGS,is dewatered during the <br /> current drought conditions, and even in a wet year will not provide adequate flow. A screened interval ,..... <br /> for the extraction well between 30 and 50 feet below grade is proposed. The recovery well will be located <br /> near the former underground storage tank(Figure io),in the center of the plume of TPH-G and benzene, <br /> To provide room for a water table depression pump and product recovery pump,the recovery well <br /> will be 12 Inches in diameter. To prevent transport of hydrocarbons from the upper to the lower aquifer, <br /> the recovery well will be installed utilizing air rotary drilling techniques and drive casing. Soil samples will <br /> be collected at a minimum of five feet intervals, and classified in the field by a Groundwater Technology <br /> geologist according to the Unified Soil Classification system. Tne samples will be screened for their <br /> volatile hydrocarbon content in the field using a photoionization detector equipped with a 10.2 eV bulb. <br /> Based on the lithologies encountered in the field, the exact screen interval may change from that <br /> proposed here. <br /> The annulus between the borehole and the well screen will be filled with a filter pack designed <br /> based on sieve tests performed on Soil samples from the water bearing zone(Appendix 111). A two fool <br /> bentonite sea]will be placed above the filter pack,and grout will be installed from the bentonite to within <br /> jj2g of grade to provide a sanitary seal. <br /> A permit to install the recovery well will be obtained from San Joaquin County Public Health <br /> • [developed <br /> rvices,Environmental Health Division(PHSIEHD). After installation,the recovery well will be thoroughly <br /> by surging and pumping. Sustained flow rates during development will be recorded and used <br /> establish the pump test parameters. <br /> r 3 + 4o 7 <br /> Glt[lUNMN'am? <br /> TunNOLOCY INC. <br />