ARCHIVED REPORTS_XR0007134 - Laserfiche WebLink

Home Browse Search

Blaen Environmental Management Inc U Haul#709 50 1 002 70950-04 2"1 Qtr 2003 Groundwater Monitoring Report 6127103 4 0 CONCLUSIONS 1 Blaes Environmental conducted the groundwater monitoring and sampling event for the Second Quarter 2003 at U-Haul Facility #709-50 in Stockton, California on May 5-7, 2003 Average groundwater levels 1 recorded in May 2003 were slightly higher than those recorded during the March 2003 monitoring event Based on the groundwater level measurements from both middle "B" and lower "C" casing wells the groundwater surface map for May 2003 indicates a flow direction toward the north/northeast in the "B" horizon and a flow direction toward the south/southeast in the "C" horizon Based on the May 2003 R groundwater gradients, the "C" honzon appears to show signs of residual pumping affects while the "B" horizon does not Groundwater flow directions are expected to have returned to the previously observed southerly trend since domestic well pumping has resumed following the installation of the carbon treatment system Analytical results of groundwater samples collected in May 2003 from both "B" and "C" casing wells indicated the presence of hydrocarbons in groundwater beneath both the U-Haul Facility and the Former � Harry's Auto Mart Facility Results of samples collected from the "B" casing wells revealed that the main portion of the U-Haul hydrocarbon plume is located around wells MW-2B, MW 3B, and MW-413 The main portion of the Former Harry's Auto hydrocarbon plume is located beneath HA MW-1 Results of samples collected from the "C" casing wells revealed higher hydrocarbon concentrations near wells MW-2C and MW-4C Based on the May 2003 analytical results, there appears to be limited communication between the "B" and "C" horizons The LNAPL such as TPH and BTEX, appears to be concentrated to the "B" horizon while the heavier DNA-PL such as 1,2 DCA, has penetrated more extensively into the "C"horizon 11