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' U-Haul#709-50 Additional Site Charactenzatlon Blaes Environmental Final completion of each well was flush with the ground surface with a traffic rated well vault Following completion, a licensed land surveyor "tied-in" the top-of-casing well elevation to an on-site reference The final completion of the wells are shown on the well diagrams included in Appendix E along with the data sheet received from the survey contractor 3 3 3 r n ater i nn Md-Sam "ling On February 8 and 9, 2000, Blaes Environmental gauged and sampled the eight new on-site groundwater ' monitor wells at the site Groundwater levels were measured to the nearest 0 0 I-foot from the top of the monitoring well casing to the groundwater surface using a Heron® interface probe Measurements were ' recorded on a field data sheet and used with the top-of-casing elevation to determine the groundwater elevation at each well In addition to measuring groundwater levels at each well, dissolved-oxygen Imeasurements were taken using a YSI-85 dissolved-oxygen meter Both instruments were decontaminated before use, between well measurements, and following completion of the measurement ' task Groundwater levels and dissolved-oxygen measurements are presented on Table 5 Prior to sampling, each well was purged using a decontaminated 2-inch GeoDurham® submersible pump or hand bailed using a new 1 5-inch by 2 5-foot disposable bailer Choosing between the two types of Purging equipment depended upon the amount of water needed to be purged and he amount of water standing in the well In general, Blaes Environmental purged approximately g three well volumes of groundwater from each well Purged groundwater was stored in two, 55-gallon steel drums pending t waste profiling and disposal The conductivity, salinity and temperature of purge water during purging activities The groundwater monitoring and sampling field procedures and he field notes taken during purging activities are included in Appendix F ' Blacs Environmental collected groundwater samples from each well using a disposable bailer and laboratory prepared sample containers The list of samples is included on Table 6 Samples were immediately labeled and stored in an iced cooler pending delivery to the laboratory Proper chain-of-custody was followed for shipment of the samples to the laboratory For quality assuranceu oses an p rp equipment blank sample (EB-0200) and a duplicate sample from monitor well MW-6ab were also collected during sampling activities The equipment blank sample was collected from the final rinse of the decontamination wash water to check for possible cross contamination of purging or monitoring equipment The duplicate sample was used to evaluate the 12