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Work Plan for Manna Pro Corporation August 19, 1993 <br /> 4004 S EI Dorado, Stockton, California 2 <br /> Monitoring Point Installation Three nested monitoring points will be installed using hollow stem auger <br /> techniques The monitoring point locations are shown in Figure 1, Attachment 1 Each monitoring point <br /> will consist of one 2-inch diameter groundwater observation well and three vapor monitoring points <br /> Installed at different depths These will be used to monitor the effects of the pumping test on <br /> groundwater levels and vacuum Influence in the vadose zone Up to two soil samples may be collected <br /> from each borehole and analyzed for BTEX, TPH-as-gasoline, and TPH-as-diesel The samples will be <br /> selected based on lithology and field readings with a PID Monitoring point construction details are <br /> Illustrated in Figure 3, Attachment 1 <br /> Well D veto meet The extraction and observation wells will be developed by a surge and bail <br /> technique to remove suspended sediments and to Improve hydraulic communication with the aquifer <br /> Well development water will be stored onsite in a Baker Tank pending appropriate disposal <br /> Wellhead Surveying Wellhead elevations will be surveyed by Groundwater Technology field staff <br /> relative to existing monitoring wells <br /> Aquifer"acuum-enhanced Pumping Tests A 48-72 hour, constant rate aquifer test will be performed <br /> on the extraction well to complete the aquifer testing and obtain data to determine the hydraulic <br /> parameters of the aquifer (transmissivity and storage coefficient) In addition to the constant rate aquifer <br /> test, a 24 Dour, low vacuum enhanced aquifer test and a 24-hour, high vacuum enhanced aquifer test <br /> will be performed During the constant rate aquifer test, pumping rates will be measured and water <br /> levels will be recorded for the pumping well and the three piezometers Two groundwater samples will <br /> be collected, before and after the test, for laboratory analyses for BTEX and TPH-as-gasoline <br /> , <br /> During the vacuum enhanced aquifer tests, pumping rates will be measured and water levels will be <br /> recorded for the pumping well and the three piezometers In addition, the vapor points will be <br /> monitored for response to the applied vacuum Air samples will be collected during the vacuum <br /> enhanced pumping tests and analyzed for BTEX and gasoline hydrocarbons Water levels will be <br /> measured before, during and after pumping Preliminary estimates Indicate that one granular activated <br /> carbon unit will be adequate for vapor treatment during the vacuum extraction pumping test,_Carbon <br /> t.y <br /> breakthrough will be monitored during the test using a flame-ionization (FID) or photo-ionization (PID) <br /> detector The extracted groundwater generated during well development and pilot testing will be <br /> contained in a Baker Tank and stored on-site <br /> �i <br /> GROUNDWATER <br /> TECHNOLOGY, INC <br />