Laserfiche WebLink
Ozone Microsparge System Pilot Test Status Report,Former Unocal Service Station#2859,Stockton,CA <br /> June 6,2003 <br /> • Increases were observed in petroleum hydrocarbon concentrations to wells MW-2,MW-10,and MW- <br /> 11 These increases in hydrocarbon concentrations are most likely due to desorption of hydrocarbons <br /> from soil caused by the scrubbing action of the microsparge bubbles <br /> • Hydrocarbon concentrations in well NP-1 have remained less than the reporting limit during the test <br /> period with the exception of four sampling events The four occasions of detectable petroleum <br /> hydrocarbons in well NP-1 may be due to the desorption mechanism mentioned previously <br /> However, hydrocarbon impacted soil was not found at depth in well boring NP-1 GR will continue <br /> to monitor well NP-i to assess whether or not this is occurring <br /> RECOMMENDATIONS <br /> GR recommends that operation of the treatment system be continued and further groundwater sampling <br /> performed to confirm the system's effectiveness GR also recommends an additional system status report <br /> be prepared at the end of the fourth quarter 2003 <br /> 240072 06 6 <br />