Laserfiche WebLink
Ms Vicki McCartney Project No 880040 1 A 02010000 <br /> August 31, 2005 <br /> Page 3 <br /> oxygenates MTBE, di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-amyl <br /> methyl ether (TAME), and tert-butyl alcohol (TBA) using U S Environmental <br /> Protection Agency (EPA) Methods 8015GRO/8021 B and 8260B Field and laboratory <br /> procedures are presented in Attachment A Certified analytical reports, chain-of-custody <br /> documentation, and field data sheets are presented in Attachment B <br /> Elevations and Gradient <br /> Groundwater elevations measured at the site were an average of 0 66 feet lower than <br /> measured in the previous sampling event of April 18, 2005 Groundwater flow was <br /> inferred to be to the northeast at an average gradient of 0 001, which was consistent with <br /> previous sampling events Groundwater elevation data are presented in Table 1 <br /> A groundwater elevation contour map based on the July 18, 2005 data is shown on <br /> Figure 1 <br /> Final Concentrations <br /> TPHg range hydrocarbons were reported in samples from wells MW-1 and MW-3 at <br /> concentrations of 1,400 micrograms per liter (pg/L) and 100 pg/L, respectively <br /> Benzene was reported in the samples from wells MW-1, MW-3, and MW-4 at <br /> concentrations ranging from 064 pg/L to 520 pg/L Toluene was detected in the <br /> I <br /> samples from wells MW-1 and MW-3 at concentrations of 13 µg/L and 1 8 pg/L, <br /> respectively Ethylbenzene and xylenes were reported in the sample from well MW-1 at <br /> concentrations of 33 pg/L and 3 7 pg/L, respectively MTBE was reported in all <br /> samples from all wells at concentrations ranging from 12 pg/L (well MW-5) to 720 pg/L <br /> 1 <br /> (well MW-2) TBA was reported in the samples from all wells except MW-2 at <br /> concentrations ranging from 350 µg/l_ (well MW-3) to 8,500 pg/L (well MW-1) <br /> Groundwater analytical data are presented in Table 1 TPHg, benzene, and MTBE <br /> concentrations on July 18, 2005, are shown on Figure 2 <br /> DISCUSSION <br /> Groundwater elevations and apparent direction of flow were generally consistent with <br /> past observations <br /> SHAW ENVIRONMENTAL,INC <br /> C 1Do(,u suits and SetlmgslAradon ich\Desktop\ARCO\3QO5 doc <br />