ARCHIVED REPORTS XR0009035 - Laserfiche WebLink

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0 2.3 Regulatory Interface Representatives of Upgradient and Teresi met on December 29, 1995 and again on January 10, 1996 to discuss assessment options Recognizing the difficulty of in-situ remediation of diesel- contaminated soil, the possibility of further excavation of contaminated soil was discussed Upgradient recommended drilling a soil boring in the most contaminated portion of the excavation to assess the vertical extent of contamination Based on that information, it would then be possible to determine whether further excavation could remediate the contamination as well as assess its lateral extent, or whether additional drilling would be required to delineate the lateral extent A work plan proposing this approach was submitted to PHS/EHD on January 12 After conferring with representatives of the State Underground Tank Cleanup Fund regarding the proposed investigation, Mr Ron Rowe of PHS/EHD informed Upgradient that he would not approve a plan proposing only assessment of the vertical extent of contamination Instead, PHS/EHD required the assessment of the vertical and lateral extent of both soil and groundwater contamination In his written response to Upgradient's work plan, Mr Rowe required a minimum of three soil borings, with the probablility that one or more of these would be completed as groundwater monitoring wells In subsequent oral communication, he directed Upgradient to position one well directly south of the former pump island and one south of the tank facility, in anticipation of a south or southeastward groundwater flow direction In addition, he informed Upgradient that PHS/EHD has recently instituted a new policy requiring analysis for methyl tertiary butyl ether (MTBE) at all sites because it may be more widespread than previously thought Furthermore, because a buried, out-of-use, 12-inch-diameter domestic well had been discovered within the fueling facility during the tank removal activities, Mr Rowe directed Upgradient to perform a down-hole television survey of this well, measure its depth, and collect a groundwater sample from it before performing and other assessment activities Upgradient submitted a work plan addendum on January 24 reflecting these requirements and obtained approval from Mr Rowe to partially backfill the pump island excavation in order to create a drill site there Clean soil from the east end of the soil stockpile was used as backfill The addendum was approved on January 25, and the domestic well survey was scheduled for February 1 3.0 FIELD PROCEDURES 3.1 Domestic Well Survey A Solinst 200-foot water level meter was used to measure the depth to groundwater in the domestic well and to measure the total depth of the well on February 1, 1996 Groundwater was 2