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Margaret La orio EH From: janes.elizabeth@epamail.epa.gov Sent: Tuesday, July 12, 2005 4:20 PM To: Margaret Lagorio [EH] Subject: possible Class IV well Hi Margaret: thank you again for notifying me about the discovery of a deep industrial injection well at the railyard in Stockton. A 100' deep waste oil well directly intersecting the water table would either be a Class V or Class IV injection well, and in either case is a prohibited discharge if it received vehicle maintenance fluids. The classification depends on whether or not the well is likely to have been used for solvent and fuel waste disposal. With such a long history, it is difficult to rule out. If EPA were investigating the case, it is likely we would take similar actions to what you and I discussed on the phone. We would request the responsible party to: Sample as soon as possible, before the well collapses. Nested soil samples in at least 2 locations within 10 feet of the well bore, preferably in the downgradient direction, every 10 feet until water table, then a ground water sample Remove any recoverable product that remains and protect the well bore Describe the construction of the well to estimate what volume of fluids could have migrated out the sides before it hit the water water ; provide well log information, historic water table data, gound direction Investigate site history to the extent possible, to determine how much vehicle maintenance occurred at the site and for what periods of time Investigate ground water use in the vicinity, and notify downgradient well owners of the discovery and sample results. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Elizabeth Janes (415) 972-3537, FAX (415) 947-3549 USEPA Region 9 Ground Water Office (WTR9) Underground Injection Control Program 75 Hawthorne Street, SF, CA 94105 http://www.epa.gov/region09/water/groundwater/uic-classv.html 1