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Project No.013-10101 <br /> Page No. 2 <br /> subject site as defined by ASTM E 1527-05. However, the following potential environmental concerns <br /> (PECs)were identified in connection with the subject site: <br /> • During Krazan's April 2, 2010 site reconnaissance an operational wash rack was observed in the <br /> northern portion of the on-site building and access ports fbr an associated subsurface clarifier <br /> were observed adjacent to the east of the building. Surface staining associated with a 240-gallon <br /> double-walled waste oil aboveground storage tank(AST)located adjacent to the west of the wash <br /> rack was observed adjacent to e A ; although no surface staining was observed immediately <br /> adjacent to the wash rack drains. The visible portions of the wash rack drain and an associated <br /> trench drain were observed to have good structural integrity; however, standing water and <br /> sediment/sludge within the drains precluded observation of much of the interior of the drains. <br /> Additionally,two floor drains and access ports for a subsurface clarifier associated with a former <br /> wash rack were observed in the southern portion of the on-site building during Krazan's site <br /> reconnaissance. The two floor drains were dry and no odors, surface staining, or other evidence <br /> of the disposal of hazardous materials or hazardous waste was observed within or adjacent to the <br /> drains. According to Mr. Doran, Manager of United Rentals, the subject site occupant, familiar <br /> with the subject site for 37 years, the wash rack located in the southern portion of the building <br /> was utilized prior to the development of the operational wash rack in the mid-1980s. Mr. Doran <br /> stated that both wash rack clarifiers are connected to the municipal sewer system and,to the best <br /> of his knowledge, have never required significant repair. Mr. Doran stated that the operational <br /> wash rack drains and clarifier are serviced quarterly by Safety Kleen and Krazan's review of <br /> waste disposal records confirmed Mr. Dorm's statement. Consequently, although Krazan's <br /> experience with sampling and analysis of soils from properties with similar clarifier-use scenarios <br /> suggests that the potential for a significant subsurface impact is low, given the presence of the <br /> waste oil AST adjacent to the operational wash rack, the use of the operational wash rack/clarifier <br /> for 25 years,the use of the former wash rack/clarifier for approximately 12 years,and the absence <br /> of any information documenting the integrity of the clarifiers and associated plumbing <br /> connections, the condition of the subsurface of the subject site in the vicinity of the two wash <br /> rack clarifiers and their associated drains is unknown. <br /> If a higher level of due diligence is desired relative to potential subsurface impacts associated with the <br /> on-site wash racks, floor drains, and/or clarifiers, Krazan could conduct a limited subsurface soil <br /> assessment to assess the presence or absence of petroleum hydrocarbons, metals, and volatile organic <br /> 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 worn 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&ASSOCIATES,INC. <br /> Conducting Assessments Nationwide <br /> 1310101 UniWd Renals Workplan <br />