ARCHIVED REPORTS_XR0005283 - Laserfiche WebLink

Home Browse Search

GROUNDWATER ASSESSMENT REPORT installed above the filter pack between 5 and seal consists of bentonite pellets (transition seat) p A 10 feet bgs The annular seal wnststs of grout(neat cement) from 5 feet to 1 foot bgs within a six-inch bore hole The first five feet of each monitoring well was hand-augured to achieve the monitoring well annulus diameter required by the SJCEHD A 7-inch diameter traffic-rated well - -—_ -box with concrete collar and locking extension cap.was placed over each well from L-foot bgs to-- the o -the surface Refer to Appendix B for the pre-pack monitoring well diagram Table 4 summarizes the concentrations of petroleum compounds detected by laboratory analysis in soil and groundwater during the October 25 and November 16, 2001 soil and groundwater sampling effort The analytical laboratory used EPA Method 8260 to analyze soil and groundwater samples for the presence of MTBE, DIPE,TAME,ETBE, EDB, 1-2 DCA,TBA, ethanol;and-methanol=Results-of-sail and groundwater-chemical-analyses-did not detect chemical constituents above the laboratory reporting limits TABLE 4 SOIL AND GROUNDWATER LABORATORY ANALYTICAL RESULTS OCTOBER 25 AND NOVEMBER 16,2001 Sample Depth Fuel Oxygenates TBA/Ethanoll Identification (feet) TPHg/BTEX and 1,2-DCA Methanol SOIL (mgtkg) (ug/kg) (ug/kg) TP-20 23 <1 0/<0 005 <5 01<5 0 <25/<250/<2500 TP-20 % <1 01<0 005 <5 0/<5 0 <25/<250/<2500 MW-1 22 <1 0/<0 005 <5 0/<5 0 <25/<250/<2500 MW-2 25 <1 01<0 005 <5 0/<5 0 <25/<2501<2500 MW-3 16 <1 0/<0 005 <5 01<5 0 <25/<250/<2500 MW-3 30 <1 0/<0 005 <5 0/<5 0 <25/<250/<2500 MW-4 20 <1 0/<0 005 <5 01<5 0 <251<2501<2500 Water in micrograms per liter(pg(L) TP-20 - -- <50/<0 5 <5 0/<1 0 - <5 0/<50/<500 - r Fuel Oxygenates(MTBE DIPE,TAME,ETBE,EDB,TBA,ethanol and methanol)and 1,2-dichloroethane by EPA Method 8260 - =Not analyzed - — — - - -— _ -- <0 5=Concentration less than reported laboratory detection lttnat Groundwater Assessment Report 13 ESA 1200252 September 2003