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WEISS ASSOCIATES 2 2 PREVIOUS INVESTIGATIONS In December 1988, WA investigated soil conditions directly beneath the five storage ' vaults The objective of the investigation was to determine whether stored compounds were in soil beneath the vaults A total of nine soil borings were drilled near the vaults at angles of ' approximately 45° from vertical, and soil samples were collected from the borings The investigation results, including the locations of the soil borings and soil samples, are described ' in the May 1989 WA report entitled "Underground Storage Tank Investigation, Phase I" (Weiss, 1989) Two soil borings were drilled beneath each of Vaults 1, 6, 7, and 8, and one boring was drilled beneath Vault 5 The samples collected beneath the vaults were analyzed as follows 15reEt- qtr STEL, COL)_reem C&&V aerg I000GAL.. [DODGftt- SODG-H-t_ 36SOCrin- _-tzpG-Az_ Vault t Vault 5 Vault 6 Vault 7 Vault 8 ' Propylene Glycol x X X ' Ethylene Glycol X X X Total Chromium X X Hexavalent Chromium X Copper X X ' Sodium X X Sulfates X X 1 Calcium X ' Chlorides X Three soil samples from borings drilled near Vaults 6, 7, and 8 were analyzed for soluble ' chromium, copper, sodium, sulfate, calcium, and chlorides to characterize the background concentrations of these naturally-occurring compounds in the site soil ' Table I presents the results of the Phase I ethylene glycol and propylene glycol analyses ' The highest propylene glycol concentrations, up to 28,000 ppm, were detected beneath Vault 1 Propylene glycol was also detected at 2,600 ppm in the soil beneath Vault 6 The highest ethylene glycol concentration, 1,200 ppm, was also detected beneath Vault 1 Neither propylene glycol nor ethylene glycol was detected above the detection limit in any of the soil samples from beneath Vault 5 ' D \ALL\331DWG\331P1SE0 WP Page 8 i