SITE INFORMATION AND CORRESPONDENCE

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1.0 EXECUTIVE SUMMARY CRC Environmental Risk Management, Inc. (CRC) conducted a Phase II Environmental Assessment and Subsurface Investigation at the request of American Savings Bank (ASB) of Irvine, California. The environmental assessment was performed at 1888 Lockheed Court, in the City of Stockton, San Joaquin County, California. The purpose of the investigation was to determine potential subsurface contamination due to petroleum hydrocarbons from two (2) three-stage clarifiers located on the subject property. One clarifier was related to a former car wash and the other clarifier was related to a former airplane wash. The clarifiers were empty when inspected during this investigation. On November 30, 1994 seven (7) soil borings were drilled to fifteen (15) feet below ground surface (bgs) and soil samples were collected. Four (4) of the borings were drilled around the airplane wash clarifier and three (3) of the borings were drilled near the car wash clarifier. Two (2) additional soil borings were drilled by hand auger near boring BI on January 31, 1995 to further investigate the occurrence of phenol and bis(2- ethylhexyl)phthalate at 5 feet bgs in boring B1. Phenol and bis(2-ethylhexyl)phthalate are not common components of petroleum hydrocarbons and automotive fluids generally associated with car wash effluents. The laboratory analytical results from the soil samples indicate that no petroleum hydrocarbons and organic compounds associated with the airplane wash clarifier were detected in the soil. Phenol and bis(2-ethylhexyl)phthalate were detected at 5 feet below ground surface (bgs) in boring B1 near the car wash at concentrations of 0.56 milligrams per kilogram (mg/kg) and 0.44 mg/kg, respectively. Further investigation near the car wash did not detect phenol nor bis(2-ethylhexyl)phthalate in the hand auger soil borings HAI and HA2 at a depth of 5 feet bgs. The occurrence of the phenol and bis(2- ethylhexyl)phthalate appears to be localized and very limited in extent. Based on the results of the Phase II investigation, CRC recommends that no further investigation of the airplane wash and car wash clarifiers is warranted at this time. CRC further recommends that a copy of this report be submitted to the San Joaquin County Department of Environmental Health Services for review. 2.0 INTRODUCTION This report presents the results of the field investigation conducted by CRC at the ASB property located at 1888 Lockheed Court in Stockton, San Joaquin County, California (Figure 1, Topography and Site Location Map, Appendix I). This Phase II Site Assessment and Subsurface Investigation was undertaken to determine potential subsurface contamination due to the two (2) clarifiers on the property. All field activities were performed in accordance with the "Scope of Work and Work Plan for Subsurface Investigation-Phase II Environmental Assessment" prepared and submitted by CRC in September 1994 (Appendix II). CRC Environmental Risk Management,Inc. Project#2100-247-5 American Savings Bank 1888 Lockheed Court February 13, 1995 1 Stockton,California