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I ' groundwater at MW-4 were possibly isolated from those in groundwater from MW-6 (Blaes Environmental,2000) I r 2000 SaM-nhng Event ' Due to the drop in groundwater levels across the site, groundwater samples could not be collected from the upper "A" casings to September 2000 Analytical results of samples collected from the middle "B" ' and lower casings indicated that the extent of hydrocarbons at the groundwater surface is defined by wells on the northern portion of the property and that groundwater from the lower casings contained hydrocarbons across the site Again, results of groundwater samples collected from the well casings screened across the groundwater interface (middle casings `B" and MW-8A) revealed the highest Iconcentrations of hydrocarbons in groundwater from wells MW-3B and MW-4B (the former dispenser island area) The extent of hydrocarbons at the groundwater surface was defined at monitor wells MW- 8A to the northwest, and MW-5B and MW-1B to the north The slight detection of benzene 1n groundwater from monitor well MW-9B suggested that it was near the southern extent of hydrocarbons in groundwater The eastern extent of hydrocarbons in groundwater remained undefined due to detection of hydrocarbons 1n water from MW-6B (Blaes Environmental, 2000) Analysts of groundwater samples from the original wells (lower casings) indicated that detectable hydrocarbons were present in groundwater across the site With exception of the samples from MW4 and MW-6, which revealed elevated concentrations of hydrocarbons, analysis of groundwater from the other on-site wells indicated low-level concentrations of hydrocarbons In a similar manner as the June 2000 results for the lower casing samples, hydrocarbons in groundwater from the lower well casings remained undefined across the site and extended off site to the west and east (Blaes Environmental, I2000) I o7norol Blaes Project#002-70950-02 6 him C I13LAESIU-Hau1170950170950r101 doc