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v N—o ..IE-FRICKE November 9, 1989 LF -1786 REPORT ON REMOVAL OF ONE UNDERGROUND STORAGE TANK AT THE BREUNERS STOCKTON FACILITY 7676 PACIFIC AVENUE, STOCKTON, CALIFORNIA 1.0 INTRODUCTION -- This report describes tank removal activities conducted on September 18 through 21, 1989 at the Breuners Stockton facility, located 7676 Pacific Avenue in Stockton, California ("the Site;" Figure 1). During the course of this work, soil samples were collected and analyzed; results of these analyses are discussed below. This report is being submitted to the San Joaquin Local Health Department (SJLHD) and Regional Water Quality Control Board - Central Valley Region (RWQCB) on behalf of the John Breuner Company. One underground storage tank with a 10,000 -gallon capacity was removed under SJLHD Permit. A copy of this permit is included in Appendix A. Reportedly, the tank had been used most recently for diesel storage, but had been used previously for gasoline storage. 2.0 TANK REMOVAL PROCEDURES Excavation, tank removal, backfilling, and re -surfacing were performed by Trumpp Brothers, Inc., of San Jose, California, on September 18 through 21, 1989. A Levine•Fricke field engineer was on site to observe tank removal activities and to collect soil samples from the tank excavation. Ms. Kasey Foley, Environmental Health Specialist with the San Joaquin Local Health District, and Mr. Rodney Ezell, from the Stockton Fire Department, were also on site to observe tank removal and soil excavation/sampling activities. 2.1 Tank Stabilization Procedures and Tank Contents Disposal The tank was rendered inert by removing the remaining fluid from it (approximately 250 gallons) and inserting approximately 190 °- pounds of dry ice to remove organic vapors and oxygen from the tank. Explosivity meter readings in the tank taken at least one hour after the dry ice was inserted indicated that vapor concentrations were below the Lower Explosive Limit of 20 percent. -1-