FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

RPM-SOH and Groundwater Investigation Gateway Project,City of Stockton I ._ .. `Ari]10,200U u Page-7- PID measurements 'above-the instrument detection limit of I ppm total organic vapors were not present in the groundwater samples collected from.GPI, GP2, GP4, and GP5. ;A slight petroleum hydrocarbon odor was noted in the groundwater sample collected from GP 1. Each groundwater sample,was.gently pumped into the appropriate laboratory-supplied containers. The ` sample containers were sealed; labeled, and placed in a cooler chilled with ice for delivery under chain- of-custody procedur'e's to GeoAnalytical Laboratories, Inc. of Modesto,California, for analyses. L . -=.,- - — 3.5 LABORATORY ANALYTIC _ AL METHODS AND RESULTS The soil and groundwater=samples collected,from the Geoprobe borings were analyzed. for methyl.. _ tertiary but' 1 ether (MTBE) and benzene t y ( ) ,_aoluene; ethyl benzene, and total xylenes (BTEX) by EPA Method 8020. -The soil:and groundwater samples were also analyzed for total petroleum hydrocarbons quantified as gasoline (TPH=G) by Method 5030/LUFT and for total extractable petroleum hydrocarbons (TEPH) quantified as kerosene, diesel and�motor. oil by Method .3550/LUFT '(soil) -and' Method 3510/LUFT(groundwater):"- 3.54 Results of Soil Samples The laboratory analytical .results.indicate that TEPH quantified as motor oil was detected at a = concentration of '131 milligrams-per-kilogratii (mg/kg) in the soil sample collected from GP5 at approximately 24 feet bgs. '.None of the other analytes were detected at or above the laboratory reported ` detection limits in that sample. BTEX, MTBE, TPH-G,-and TEPH were not detected at or above the laboratory rdported detections limits in any of the other soil samples collected from borings GP2 through {' = GP5. BTEX, MTBE;TPH-G,and TEPH were not detected at or above the-laboratory reported detection limits in the soil samples-collected.from GPI at approximaiely 12 and 30 feet bgs. ;Total'xylenes and _ TEPH quantified as diesel were detected at concentrations of 5.7 micrograms per kilo am and. ` gT p g (jig/kg) 3.0 mg/kg, respectively,"in the soil sample collected from GPI at approximately f6-feet bgs. Ethyl benzene, total xylenes,..and TPH-G were detected at concentrations of 10 gg/kg, 27 Ag/kg,!'and 5.9 mg/kg, respectively; in:the 3soil sample collected from GPI at approximately 26 feet bgs. None of theJ. _ es were detected at or-above the:laboratory reported detection limits in the soil samples other anal� collected from.GP I at 16 and 26 feet bgs. t� CONDOR