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Ms Margaret Lagono Page 2 of 3 • Groundwater Sampling An experienced Ground Zero technician purged and sampled the site wells on September 6, 2002 The wells were purged of at least five well casing volumes of water using a centrifugal pump prior to sampling The field technician measured the physical parameters of temperature, pH, and electrical conductivity during the purging process Purged groundwater was contained in appropriately labeled DOT-approved 55-gallon drums The drums are currently being stored onsite pending disposal After groundwater parameters had stabilized and water levels had recovered to at least 80% of pre-purged levels, groundwater samples were collected using dedicated, disposable bailers and transferred into appropriate containers The samples were then placed into an ice-chest refrigerated to approximately 4°C and transported to Argon Laboratories (ELAP #2359) under chain of custody protocol Field notes and purge logs are included in Attachment A Groundwater Analytical Results Argon Laboratories analyzed all groundwater samples for benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA method 8020, and for total petroleum hydrocarbons as gasoline (TPHg) using EPA method 8015M Irl h� d 1 r'm`+ 4414A 4'nA l�z0. Oar 1�'L Well MW1 contained TPHg, benzene, ethylbenzene, and xylenes at 620 parts per billion (ppb), 2 8 ppb, 16 ppb, and 14 ppb, respectively No toluene was detected in well MWI No TPHg or BTEX constituents were detected in well MW2 Well MW3 contained TPHg, benzene, and toluene 98 ppb, 0 5 ppb, and 0 8 ppb, respectively No ethylbenzene or xylenes were detected in well MW3 Groundwater analytical results are summarized in Table 2 Laboratory reports are included in Attachment B SUNMARY • Groundwater elevations beneath the site fell an average of 0 78 feet between June 11, 2002 and September 6, 2002 Groundwater beneath the site flows toward the north at a relatively mild gradient • Only well MW 1 (2 8 ppb) had concentrations of benzene above the Maximum Contaminant Level (MCL) of 1 0 ppb Toluene, ethylbenzene, and xylenes in all site wells were below both the primary and secondary MCLs for those chemicals in all site wells No gasoline or BTEX constituents were detected in well MW2 The next quarterly groundwater monitoring and sampling event at the site is scheduled for December 2002 Ground Zero will notify EHD at lease 48 hours prior to conducting any fieldwork G IData\GROUNDZE\Souza\Reporlsl3QMR_2002 doc