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Project No.013-10141 <br /> Page No.3 <br /> operational wash rack drains and clarifier are serviced quarterly by Safety Kleen and Krazan's <br /> review of waste disposal records confirmed Mr. Doran's statement. Consequently, although <br /> Krazan's experience with sampling and analysis of soils from properties with similar clarifier-use <br /> scenarios suggests that the potential for a significant subsurface impact is low,given the presence <br /> of the waste oil AST adjacent to the operational wash rack, the use of the operational wash <br /> rack/clarifier for 25 years, the use of the former wash rack/clarifier for approximately 12 years, <br /> and the absence of any information documenting the integrity of the clarifiers and associated <br /> plumbing connections,the condition of the subsurface of the subject site in the vicinity of the two <br /> wash rack clarifiers and their associated drains is unknown. <br /> Krazan recommended that if a higher level of due diligence is desired relative to potential subsurface <br /> impacts associated with the on-site wash racks,floor drains, and/or clarifiers, Krazan could conduct a <br /> limited subsurface soil assessment to assess the presence or absence of petroleum hydrocarbons, metals, <br /> and volatile organic compounds. <br /> • An apparent subsurface hydraulic ram reported to be the location of a former hydraulic vehicle <br /> hoist was observed in the southern portion of the on-site building. Mr. Doran stated that the on- <br /> site hydraulic hoist has not been operational for many years; however, Mr. Doran stated that he <br /> did not recall exactly when or how long the hoist was operated on site. Mr. Doran stated that he <br /> has no knowledge of the type or condition of the subsurface hydraulics associated with the former <br /> hoist. Consequently, it is unknown exactly when the subsurface hydraulic hoist was installed, <br /> how long it was operated on site, or how it was abandoned. Krazan's experience with subsurface <br /> hydraulic hoists indicates that minor releases of hydraulic fluid commonly occur due to wom ram <br /> seals, although the release is typically localized to the area of the release source due to the low <br /> mobility of hydraulic fluid in the environment. Therefore, the potential appears to be low for a <br /> significant environmental impact to the subject site from hydraulic fluid associated with the <br /> former vehicle hoist. However, given the potential 37-year period of time in which the hydraulic <br /> hoist may have been located on site, the potential exists for subsurface releases (leaks) of <br /> hydraulic fluid and the condition of the subsurface soil in the vicinity of the former hydraulic <br /> hoist is unknown.* <br /> Krazan recommended that if a higher level of due diligence is desired relative to potential subsurface <br /> impacts associated with the former on site hydraulic hoist, Krazan could conduct a limited subsurface <br /> soil assessment to assess the presence or absence of petroleum hydrocarbons and polychlorinated <br /> biphenyls in the vicinity of the former hoist. <br /> *The hoist was later determined by Krazan to be pneumatically-operated, and therefore, was not <br /> investigated as part of this assessment. <br /> 5.0 PURPOSE AND SCOPE OF WORK <br /> The purpose and scope of work for the Phase II LSI was to preliminarily assess the current conditions of <br /> the subsurface soil relative in the on-site areas of environmental concern (active and inactive equipment <br /> wash areas and associated drains/clarifiers) by advancing soil borings adjacent to referenced features for <br /> the collection of soil samples for analysis of the constituents of concern(CoCs)discussed below. <br /> KRAZAN&ASSOCIATES,INC. <br /> Conducting Assessments Nationwide <br /> 1310141 United Rentals L$I DRAFLdoc <br />