ARCHIVED REPORTS XR0007669 - Laserfiche WebLink

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' Bridgestone/Firestone, Inc. 400 N. El Dorado, Stockton, California February 2+ 1994 Site Assessment Report--RMI 207201 Page 2 of I2 1.0 PURPOSE AND SCOPE The general purpose of ongoing site activity, as defined by the U S Environmental Protection Agency, is to satisfy the December 22, 1998, UST system upgrade and/or closure requirements as defined in 40 CFR Part 280 21 The purpose as defined by California Water Quality Control Board -- Central Valley Region is to delineate the areal (lateral and vertical) extent of contamination surrounding the former UST excavation The ' specific work plan was designed to delineate existing soil contamination and evaluate the Potential for a vapor extraction remedial system This report presents those findings The scope of the proposed work plan dated October 6, 1993, and approved by Mr Harlin Knoll of the SJCEHD on October 11, 1993, included installation of five soil borings surrounding the UST excavation to depths necessary to define contamination One of the borings was to be completed as a 4-inch vapor extraction well The signed well permit application is included in Appendix 8 2 Five-foot interval sampling, systematic sample selection, and analyses including EPA and California Department of Health Services ' (CADHS) Methods 8015M, 8020, and 5520 were also included within the scope of proposed work A soil vapor extraction pilot study was also proposed in the October 6, 1993, work plan Following field activity, Ryan-Murphy determined that the delineation would be completed prior to determining the applicability of the pilot study The findings reported herein will be utilized in the preparation of a Soil Remediation Plan ' 2.0 SITE DESCRIPTION AND HISTORY The referenced property is located at 400 North El Dorado Street, Stockton, California ' The facility is located in Township 1 North, Range 6 East (at 37057'25" Latitude and 121017'23" Longitude) as depicted on the USGS Stockton West, CA 7 5-minute topographic quadrangle (Appendix 8 1) This facility, which originally provided gasoline filling services, is inactive and has been vacated by Bridgestone/Firestone, Inc , which leased the facility from the owner -- D S ' Wasserman Trust, Sacramento, California On April 25, 1991, Ryan-Murphy, Incorporated supervised the removal of 12 underground storage tanks (USTs) and appurtenant piping from the facility The tanks were believed to have been used for storing leaded gasoline and used motor oil Laboratory analyses of soil samples collected from the UST excavations satisfied regulatory compliance objectives at all locations except the area surrounding tanks 4 and 5. Soil samples in this area contained hydrocarbon concentrations above state regulatory action levels RYAN-MURMY, INCORPORATM Denwer FuvisonmenW Coos Arlon Maagement XAw Angeles