SITE INFORMATION AND CORRESPONDENCE FILE 1

Home Browse Search

08/24/2000 16:35 2095385 GEOLOGICAL TECH.,,"o PAGE 06 Geo(ogicu(7etFinics 2nc. Page 3 Valentine(Castle Motors) Vertical Def.WP August 23,2000 • Benzene,toluene, ethylbenzene and xylene (BTEX) by EPA method 8020. • Gasoline range petroleum hydrocarbons (TPH-Gas)by EPA method 5030/8015(;m). • Methyl Tertiary Butyl Ether(MTBE)by EPA method 8020. • In addition,two soil samples will be analyzed for the fuel oxygenate suite (MTBE, DIPE, ETBE, TANTE & TBA)by EPA method 8260. The detection limits for these compounds axe listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity. Ethers 12DCA '1'13A TP -G Detection Limits: 8020 8260 EDB 8260 8015m Soil(µg/Kg) 3.0 5 50 20 1,000 2.2 Soil & Pore Water Sample Collection with the SimulProbe When intervals are detected that are suitably coarse grained, attempts will be made to collect pore water samples using the SimulProbe sampling tool. The SimulProbe allows a pore water sample to be collected at the exact interval from which a soil sample is collected thus providing correlative inforxnation on the sorbed portion of the contaminated zone. Furthermore, the SimulProbe's design reduces the possibility of cross contamination from shallower borehole waters. After the SimulProbe groundwater sampling tool is advanced into the saturated zone,the tool is retracted to expose the screen. The sample collection chamber is allowed to fill under ambient hydrostatic pressure_ Once full the chamber is sealed with a pneumatically actuated (Nz gas) solenoid valve and the apparatus is brought to the surface. The sample chamber is carefully emptied using a bottom-emptying device thus reducing the possibility of sample agitation and volatilization. Once the sample container (40-m1 VOA) is filled and capped, the bottle will be inverted, tapped, and checked for headspace bubbles. The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for transport to the laboratory. Once the borehole has extended below groundwater, pore water samples will be collected at geologically significant units using the SimulProbe. It should be noted that collection of pore water samples tonight not be successful in clay units. 2.2.1 Soil & Pore Water Sample Analysis Up to five samples of soil-pore water from MW-201 will be submitted to CLS Laboratories (State Certified Laboratory#1233). Samples will be analyzed for the following: • Benzene, toluene,ethylbenzene and xylene(BTEX)by EPA method 8020. • Gasoline range petroleum hydrocarbons(TPH-Gas) by EPA method 5030/8015(m). • Fuel oxygenate suite (MTBE, DIPS, ETBE,TAME& TBA.)by EPA method 8260. • 1,2-DCA, EDB,Methanol, &Ethanol by method 8260. The detection limits for these compounds are listed below. A Chain of Custody will be completed for all samples collected and tracked to ensure sample integrity.