Laserfiche WebLink
Quarterly Groundwater Monitoring Report - First Quarter 2016 <br /> L&M Operable Unit- West Weber Avenue and North Lincoln Street,Stockton, CA <br /> April 29, 2016 <br /> • <br /> Analyte Sample # Sample # <br /> UPSV-6 UPSV-6-DMoo <br /> TPHg /m3 340,000 320,000 <br /> Benzene /m3 61 56 <br /> Methane mV 300,000 300,000 <br /> Analyte Sample # Sample # <br /> APSV-15 APSV-15-D % Difference <br /> TPH /m3 310,000 290,000 6:7% <br /> Benzene /m3 <40 <40 0.0% <br /> Methane mV 120,000 120,000 0.0 % <br /> The trip blank did not contain analytes at or above laboratory reporting limits. These data are <br /> considered valid. <br /> 4.3 UPSV SOIL VAPOR CONCENTRATION TRENDS <br /> TPHa Trends <br /> • TPHg concentrations in vapor samples collected from UPSV-3, UPSV-6, and UPSV-6D, decreased <br /> from concentrations reported during 4Q 15 <br /> There was no change in TPHg concentrations reported for all other UPSV wells during 1 Q16. <br /> Benzene Trends <br /> Benzene concentrations in vapor samples collected from UPSV-6 and UPSV-6-D decreased from <br /> concentrations reported during 4Q15. <br /> There was no change in benzene concentrations reported for all other UPSV wells during 1 Q16. <br /> Naphthalene Trends <br /> There was no change in naphthalene concentrations reported for all UPSV wells during 1 Q16. <br /> Methane Trends <br /> Methane concentrations in vapor samples collected from UPSV-6 and UPSV-6D decreased from <br /> concentrations reported during 4Q15. <br /> Methane concentrations in vapor samples collected from UPSV-3 increased from concentrations <br /> reported during 4Q15. <br /> • There was no change in methane concentrations reported for all other UPSV wells during 1 Ql 6. <br /> ® Stantec 13 <br />