Laserfiche WebLink
1 <br /> r <br /> colo ical re h <br /> C ni g c ccs 1/tc, <br /> ' 1101 Vh Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> Groundwater Monitoring <br /> 1" Quarter 2002 <br /> rMorita Brothers <br /> 814 E. Charter Way <br /> Stockton, CA <br /> Project No 724 2 <br /> May 14, 2002 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 1" Quarter 2002 round of groundwater monitoring and testing <br /> that took place on March 12, 2002 The laboratory analyses indicate that five of the ten <br /> monitoring wells on this site remain impacted by gasoline range petroleum hydrocarbons <br /> The groundwater contamination plume appears to have migrated off site as evident from <br /> detection in well MW-106 The contamination is present in well MW-106 at a depth of <br /> approximately 22 feet below the water table <br /> The average groundwater elevation in the water table wells at the site was—18 67 feet mean <br />' sea level (msl) and this corresponds to approximately 33 feet below grade surface (bgs) <br /> Project historic low groundwater stands in the early 1990's were 20 feet lower than the <br /> current level This is part of the problem with trapped residual hydrocarbons below <br />' groundwater that act as a source of groundwater contamination <br /> Groundwater gradient calculations show that groundwater flow was S72°E at 0 0034 ft/ft for <br /> r the event of March 12, 2002 The rose diagram in Figure 4 shows that the groundwater <br /> gradient at this site is consistently toward the east <br /> r <br /> r <br />