Laserfiche WebLink
SEP <br /> ENVIROMENTAL HEALTH <br /> The Test <br /> PERMIT/SERVICES <br /> Each of two pump tests will be conducted for 72 hours and <br /> consist of 3 phases: <br /> Phase 1 . Monitor each observation well and the pumping <br /> well to establish the static water level in each for a 24- <br /> hour period using In-Situ Hermit two channel data loggers <br /> and depth transducers. <br /> Phase 2. Pump the well at a continuous rate of 2 gpm <br /> or sustain an able rate for a period of 24 hours . During <br /> the test, the discharge rate from the pumping well will be <br /> periodically checked and the drawdown in the observation <br /> wells will be monitored by In-Situ data loggers and <br /> transducers . <br /> Phase 3 . Monitor the wells during recovery, for 24 <br /> hours . This data can be used to check the pumping and <br /> drawdown data. <br /> Handling of Purge Water <br /> Purge water from MW2 and MW6 will be piped through two activated <br /> carbon filters connected in series and then emptied into a 6, 500 <br /> gallon corrosion-resistant polyethylene storage tank. The purge <br /> water will be stored on site until laboratory analysis confirm <br /> that the dissolved levels of TPH and BTX have been reduced to <br /> levels below the limits set by the City of Stockton Municipal <br /> Utilities Department . The maximum discharge concentration for <br /> TPH is 100 mg and 0.25 mg BTX respectively. A grab sample of <br /> filtered water stored in the tank will be sent to a California <br /> Department of Health Services certified laboratory where they <br /> will be analyzed for TPH by EPA Method 8015 and for Benzene, <br /> Toulene, Xylene and Ethylbenzene using EPA method 602 with 24 <br /> hour turn-around. Pending the results, the stored purge water <br /> will either be refiltered and sampled until the Municipal Utility <br /> Department water quality standards are met and then discharged <br /> into the sanitary sewer or hauled to the sewage treatment plant <br /> for final treatment . <br /> Application of Results <br /> From the results of the pump and recovery test, drawdown and _ <br /> zones of influence will be determined. Sustainable pumping rates <br /> can also be calculated. An effective design for remediation can <br /> be conceived and engineered with this information. The need for <br /> additional pumping wells can also be assessed. <br /> 2 <br />