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Mr. Dave Henry • • Project AE5701 June 5, 1998 Page 3 designated by Hazard Management Consulting, Inc. of the appropriate actions to be taken with respect to the impacted materials; and • preparing this letter report. Groundworks would also work closely with Hazard Management Consulting, Inc. to assist in efforts related to its disposition of any petroleum-impacted materials requiring removal from the site. Findings Groundworks first visited the site on May 5, 1998. Groundworks collected a sample of water being discharged into a storm drain located on the north side of D'Arcy Avenue. The source of the water was the dewatering system that runs the length of the D'Arcy Parkway extension. The sample was collected in the appropriate containers for the analyses performed, labeled, and placed in a cooled ice chest for delivery to Columbia Analytical Services, Inc., a State-certified analytical laboratory, with chain-of-custody documentation. The sample was analyzed for the presence of TPHd and TPHg/BTEX. Results were non-detect for all constituents for which analyses were performed (see attached certified analytical results). Groundworks attended a brief meeting at the site on May 14, 1998 to discuss the project schedule with DSS Engineering Contractors (DSS), the site contractors. Upon his arrival, Mr. Phil Dunn, President of DSS, indicated that he was ready to proceed. Work was scheduled to begin on Saturday, May 16, 1998. Groundworks observed excavation and sanitary sewer pipe placement activities performed by DSS on May 16, 1998. A Minirae® PID was used to monitor the general work area, and to monitor the excavated soils to assess whether petroleum-impacted soils were encountered. No stained soils were observed, and groundwater in the base of the excavation was not observed to have a sheen. There was no indication of elevated concentrations of volatile organic compounds (VOCs) in air downwind from, or within, the portions of the excavation that were readily accessible to Groundworks. There were no PID readings observed above 2 ppm. Strong odors, and elevated concentrations of VOCs (as indicated by the PID) were noted in some of the soils excavated on May 19, 1998. The elevated PID readings were obtained by placing the PID probe immediately adjacent to the apparently impacted soils. The PID readings in air remained low (S2 ppm). The elevated concentrations were generally less than 10 ppm, but on several occasions readings of up to 60 ppm were indicated. The readings in excess of 10 ppm were generally associated with a relatively clayey, greenish soil that was encountered at approximately 10 feet bgs. The petroleum-impacted soils were excavated from a relatively small area which appeared to coincide with the former diesel spill area. Groundworks Environmental, Inc. AE5701.DOC