ARCHIVED REPORTS XR0007010 - Laserfiche WebLink

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1 I the levee under the deck ind stairs, along a retaining wall and was puddling on the grass and into the roadway behind the levee" After considerable hand work under the deck, Falcon reported that"the diesel line was joined at a deep depth[below ground surface] at a puncture point by a rubber hose which had collapsed under the weight of the fill at that depth" The Falcon report recommended that the broken diesel line as well as two gasoline lines which also ran under the building should be capped A representative from San Joaquin County Health Services Environmental Health Division (SJCEHD) inspected the purging and capping of the fuel lines prior to the lines being capped The fuel Imes were then to be run aboveground According to the 1991 Problem Assessment Report prepared by RESNA, a preliminary soils investigation of the King Island portion of the site consisted of hand augering 19 shallow soil borings around the marina and store buildings, the USTs and levee Analytical results were not available for review but a later RESNA report indicated that free product was discovered in soil boring 10 (SB 10)which was located between the Marina office and store buildings A Tani.Removal Report prepared by RESNA documented the removal of a 2,000-gallon, steel, leaded gasoline UST and associated piping from the King Island property in 1991 The report stated that the UST and pipuag was in good condition Analytical results for the soil samples indicated non-detectable levels of TPH.,with the exception of 0 045 mg/kg of toluene Total lead was detected at concentrations up to 47 mg/kg A hand written note attached to the February 20, 1992,UST unauthorized release report refers to a March 26, 1992 conversation with Tana LaPage of RESNA (currently Smith) in which it was discussed that lead concentrations would be ignored by the County since a closure report would not be issued based on the pipes remaining under the building It was noted that only if a way were found to test under the store could a closure report ever be issued on the removal RESNA installed five monitoring wells (MW i-MW5) on the King Island property between March and April 1991 to determine whether groundwater had been impacted and if so to what extent An additional momtonng ' well(MW6)was installed in September 1993 to further define groundwater contamination at the site MW4 was abandoned and replaced in August 1995 due to an infiltration of organic debris ' Review of Quarterly Monitoring Reports prepared between 1991 and 1994 indicated the foIlowmg trends in analytical results Samples collected from MW-1 and MW-2 were below detection limits for every sampling event MW-3 has shown non-detectable concentrations for TPH and BTEX for every sampling event,with the exception of toluene and xylenes (0 9 and 2 4 gg/Q respectively) in the first sampling event Concentrations up to 6,900 pg/k TPHg , 2,600 TPHd, and 3,300 benzene were detected in MW-4 from May 1991 through September 1993 Non-detectable concentrations for all analytes were seen in MW4 during the December 1993 sampling event Concentrations of TPHg ranged from 160 to 260 µg/e until the well was abandoned un 1995 The replacement well MW4R showed non-detectable concentrations for all analytes dunng the August 1995 sampling event Concentrations from 90 to 26,000µg/9 of TPHg, 510 to 570 µg/Q TPHd, and 6 6 to 1,700 µg/e of benzene were ' detected to MW5 from April 1993 tluough December 1993 MW5 showed non-detectable concentrations of TPH and BTEX during the June and December 1994 and the September and October 1995 sampling events h fur lrccSkJihtkhlni rix 50133-00 -02 2