WORK PLANS - Laserfiche WebLink

Home Browse Search

i I �J 11 January 2007 AGE-NC Project No. 00-0769 Page 5 of 8 and to allow coarser sediment to settle out prior to treatment. The process pump will be located directly in line after the sediment holding tank. The first stage of treatment media is contained in a 2,000-pound Oil-out adsorber granular activated carbon (GAC) adsorber vessels piped from a 50-micron suspended solids filter; the final three stages of treatment media are contained in three 2,000-pound GAC vessels. The first vessel will contain a specialized liquid-phase filter media that selectively removes free and sparingly soluble oil from waste water (total petroleum hydrocarbons as gasoline - TPH-g) which extends the life of activated carbon. The final three vessels will contain a speciallyprepared coconut shell-base granular activated carbon to adsorb TPH-g, benzene, toluene, ethylbenzene, total xylenes (BTEX) and chlorinated compounds. Sample ports will be located between all vessels to allow sampling for detection of potential media break through and to obtain final discharge samples. The system layout is depicted in Figure 2 . 2. 5 . GROUND WATER EXTRACTION AND TREATMENT SYSTEM START-UP The treated ground water will be disposed into the City of Stockton Municipal Sewer and transfer to the Regional Water Quality Control Plant under permit. A sample will be collected for treatment verification, prior to initial discharge. Meter calibration will be conducted prior to ground water remediation start up. During the pump and treat start-up period (first two weeks of operation), ground water influent and effluent of the treatment system, depth to ground water measurements and operational parameters (ground water flow meters, fluid level sensors, total flow indicators and lower explosive level-LEL) will be monitored daily to ensure optimal removal of dissolved hydrocarbons. 2 .6. MONITORING AND MAINTENANCE Routine ground water samples from the pump and treat system influent, effluent and intermediate stages will be collected on a bi-weekly basis and submitted to a State of California Department of Health Services (DHS)-certified laboratory for analysis of the following constituents: • TPH-g in accordance with EPA Method 8015 Modified; I • BTEX, fuel additives (MTBE, ETBE, TAME, DIPE, EDB and 1 ,2-DCA) in accordance with EPA 8260. Additional ground water analysis will be in accordance with City of Stockton permit requirements. Advanced GeoEnvironmental, inc.