ARCHIVED REPORTS XR0001110 - Laserfiche WebLink

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'I Monitonng wells MW-1 through MW-6 were previously surveyed in April 1992 'I After water levels were measured, a submersible purge pump was used to purge monitoring wells MW-2 through MW-9 MW-1 was not purged due to the presence of free product Five to 10 gallons (minimum of three well volumes) of water were removed from each ' purged well Temperature, pH and conductivity were measured at one-gallon intervals Additional water was purged from MW-7, MW-8 and MW-9 to develop these wells Stabilization data and held logs are included in Appendix B The purge water was stored ' in 55-gallon drums on-site A water sample was collected from MW-2 through MW-9 using a new disposable plastic bailer At the request of the PHS/EHD, a sample was also collected from MW-1 The samples were collected in 40-m1 EPA vials and one-liter amber bottles ' 3.5 Laboratory Analysis of Soil and Ground►iater Samples ' Selected soil samples were analyzed for total petroleum h)drocarbons (TPH as gasoline and diesel) and volatile aromatics (BTESX) in accordance with EPA methods 8015m and 8020. respectively Water samples were analyzed for TPH (gasoline and diesel) and BTE&,X in ' accordance with EPA methods 8015m and 602, respectively ' 4.0 FINDINGS 4.1 Stratigraphy Clayey to sandy silts were present from the surface to a depth of 10 to 15 feet Fine grained ' sand was encountered fiom below the silts to depths of 30 to 35 feet Sandy silts "ere then encountered in Boiing B-17 fiom 35 feet to 45 feet Boring logs fiom the installation of MW-1 to MW-3 indicated sands thiouahout most of the borings Boring logs from the installation of MW-4 to MW-6 indicated finer-grained materials, predominantly clays and ' silts Boring Logs are included in Appendix A 4.2 Organic Vapor Concentrations During drilling, auger returns and soil sample duplicates were screened for organic vapors ' using the PID Organic vapors were detected in the 25-foot and 30-foot samples from boring B-15 at concentrations of 9 ppm and 24 ppm, respectively Organic vapors were detected in boring B-17 (MW-7) at concentrations up to 244 ppm ' No organic vapors were detected during the didling of borings B-14 (MW-9) or B-16 (MW- S) Organic vapor readings are included on the boring logs (Appendix A) ' 4.3 Analytical Results of Soil Samples A total of 11 soil samples were transmitted to a state certified laboratory for analysis TPH C-1,-1�Q'1 hGf Servarr 1- W— 6 k; &MC4S Nom U�QR1A2 9�