Laserfiche WebLink
Workplan for Completion of an Aquifer Test <br /> 16 South Cherokee Lane, Lodi, California <br /> Once extraction of groundwater from Well EW-1 is terminated, measurements of drawdown <br /> in the wells will continue in order to provide recovery data Residual-drawdown graphs will <br /> I be prepared from the recovery data The analysis of residual-drawdown graphs will also be <br /> used to estimate the aquifer transmissivity <br /> 2.3 Slug Tests <br /> As it may/may not be possible to affect drawdown in Wells MW-11 through MW-13 while <br /> pumping from Well EW-1, we propose to conduct slug tests on these wells in order to <br /> estimate aquifer characteristics down-gradient of the site (Figure 2) <br /> The slug tests will be performed by rapidly inserting or withdrawing an inert solid slug from <br /> each well to be tested During the slug test, recovery of the water table will be measured <br /> by using a datalogger equipped with a pressure transducer The pressure transducer will be <br /> placed near the bottom of the well where it measures the pressure exerted by the overlying <br /> water column (head) As the water table recovers from the withdrawal of slug, the pressure <br /> transducer and datalogger record the change in hundredths of a foot Once the slug test has <br /> been completed, the data stored in the datalogger is downloaded to a personal computer <br /> for analysis <br /> We propose to analyze the slug test data using a modified version of the Theim Equation <br /> presented as Model 18 of Dawson and Istock (1991) This model applies to slug tests <br /> performed on unconfined aquifers when the well does not penetrate the full thickness of the <br /> aquifer <br /> 3.4 PROCEDURES <br /> The following section details procedures that will be implemented during the aquifer test <br /> 1) The work proposed will be conducted under the direct supervision of a California <br /> Registered Geologist <br /> 2) Prior to commencement of any work at the site, GeoAudit shall notify the <br /> CVRWQCB and the San Joaquin Public Health Services - Environmental Health <br /> Division (PHS/EHD) a minimum of 48 hours in advance, the nature of such work <br /> and time and date it will be performed <br /> 3) A site health and safety plan (SHSP) prepared in accordance with the Occupational <br /> Safety and Health Guidance Manual for Hazardous Waste Site Activities is attached <br /> (Prepared by National Institute for Occupational Safety and Health, Occupational <br /> Safety and Health Administration, U S Coast Guard and US Environmental <br /> Geological Audit Services Ine <br /> CMSJGeweke"I 3 <br />