ARCHIVED REPORTS XR0000869 - Laserfiche WebLink

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' WATER SAMPLE ANALYSIS FINDINGS • The analytical results for water samples has shown consistent positives for BTEX compounds, TPHg,Chloroform, 1,2-Dichlorobenzene, 1,2-Dichloroethane(1,2-DCA),cis-1,2-Dichloroethene, Tetrachloroethene, Tnchloroethene(TCE), and Vinyl Chloride Monitoring well MW-1 was replaced with MW-1 Sand MW-ID The water samples from MW-113 were none-detect,indicating that the sampling history of MW-1 came from the shallow sand layer Therefore the data historyfrom MW-1 was assigned to be the data history of MW-I S. ' A summary of water samples from the initial well dnlling and monitoring events is attached, Exhibit D ' MAXIMUM CONTAMINANT LEVELS For the above listed consistent positive results the State of California has established Maximum Contaminant Levels (MCL's) for primary health concerns They are as follows ' Comp and MCL.pub Wells that exceed MCL's (ppb) as of 115/06 Benzene 10 MW-3 S(11 ppb) Toluene 150 INTERPRETATION Ethyl Benzene 3000 None Xylene 1,7500 None TPHg 21.0* MW-3S(700) Chloroform Not Regulated None 1,2-Dichlorobenzene 600.0 None • 1,2-Dichloroethane(DCA) 05 M W- 1 S(2 9),M W-2 S(0 6 6),M W- 2D(0 74),MW-3S(5.1),MW-3D(1 4),MW- 5S(7 4), MW-5D(25) cis-1,2-Dichloroethene 60 MW-5D(7 5) I Tetrachloroethene 50 CPT-2@75'(5 6) Tnchloroethene(TCE) 5.0 None Vinyl Chloride 05 MW-3S(0 75) * from State Regional Water Quality Control Board UST clean up levels Again, attached is a summary of water testing, Exhibit D INTERPRETATION OF BORINGS AND MONITORING The soil lithology for the Vogue Cleaners site is characterized by alternating layers of clays and silts that are cut and filled with sand lenses There is a sand lense at 25' depth, at 45' depth, and at 75' depth Attached is a 24"x36" isometric crossection of the site to a depth of 75', Exhibit H The amount of TPHg g remainin in the soil at the Stoddard Solvent Tank(Tank#1) is estimated to be 4,788Kg The amount of TPHg remaining in the soil at the Leaded Gasoline Tank(Tank 92)is estimated to be 2,341 Kg These values are conservative and are generated from a single boring and data that is nine years old Nine years of natural attenuation would significantly reduce the measured concentrations In Exhibit A is the estimated soil influence diagram for Tank #1 and • Tank#2 3