ARCHIVED REPORTS XR0011333 - Laserfiche WebLink

Home Browse Search

i Mr Kenneth Earnest October 13, 1994 Page 2 Ground Water Sample Analytical Results Ground water monitoring wells MW-1 through MW-5 were purged and sampled using disposable bailers on September 15, 1994, in accordance with the procedures outlined in Enclosure A Field observations and ground water sampling documentation are contained in Enclosure B Ground water samples collected on September 15, 1994, were submitted to a state-certified Iaboratory for analysis of benzene, toluene, ethylbenzene, xylenes (BTEX), and total petroleum hydrocarbons as gasoline (TPHg) Ground water sample analytical results are compiled in Table 2 Ground water samples were also collected on September 15, 1994, from monitoring wells MW-2 and MW-5 and submitted for analysis of halogenated volatile hydrocarbons in accordance with U S Environmental Protection Agency (EPA) Method 601 Copies of the certified laboratory analytical reports from the September 15, 1994, sampling event are presented in Enclosure C Discussion Concentrations of dissolved benzene in ground water samples collected on September 15, 1994, ranged from less than 0 50 microgram per liter (µg/1) in the sample collected from monitoring well MW-1 to 50 jcg/l in a sample collected from monitoring well MW-3 TPHg concentrations ranged from less than detectable in the sample collected from monitonng well MW-1 to 1,100 ug/l in the sample collected from monitoring well MW-2 An inferred benzene isoconcentration map based on the September 15, 1994, ground water sample analytical results is illustrated on Figure 4 Ground water samples collected on September 15, 1994, from monitoring wells MW-2 and MW-5, did not contain detectable concentrations of halogenated volatile hydrocarbons As of September 22, 1994, the installed pump in monitoring well MW-3 has recovered 108,030 gallons of ground water As of the same date, the vapor extraction system has recovered approximately 12,479 pounds of petroleum hydrocarbons Remarks The opinions and conclusions contained in this letter report represent our professional opinions These opinions are based on currently available information and were developed in accordance with currently accepted hydrogeologic and engineering practices at this time Other than this, no warranty is implied or intended iACTON • MICKELSON• irptoo5 gsh van DAM,INC Consulting Scientists, Engineers,and Geologists