SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

nine USTs having a capacity of 7,500 gallons, and one UST (a gasoline UST) having a capacity of 8,000 gallons. The nine non-gasoline USTs were used for containing toluene, xylene, acetone, MEK, butyl sellosolv and other paint manufacturing liquids. Underground piping provided transfer of product from the USTs to dispensers in the Morton building. Underground piping also ran from the gasoline UST to the gasoline dispenser. The dispenser was located approximately ten feet from the factory, between the factory and the storefront. The Site and property to the south are currently vacant. Pursuant to the Polanco Redevelopment Act, H&SC §§33459 et seq., the REDEVELOPMENT AGENCY took corrective action against the defendants listed in the underlying court action in the Superior Court of the State of California In and For The County of San Mateo filed as The Redevelopment Agency of the City of Stockton v. Union Oil Company of California, et. al. On or about December 22, 1998, the REDEVELOPMENT AGENCY issued defendants Corrective Action Notices under the Polanco Redevelopment Act. Defendant Morton Paint did not respond within 60 days to the Notices. 2.2 Ownershin. The Site is currently owned by the REDEVELOPMENT AGENCY. 2.3 Known Substances. Portions of the Site have historically been used for temporary storage of gasoline and paint manufacturing liquids. Soil gas sampling was performed at the Site in 1989 and identified the presence of toluene at 1 part per million(ppm) and xylenes at 1 ppm in the vicinity of the USTs. The presence of ethylbenzene and xylenes in the vicinity of the USTs were confirmed during soil sampling of Borehole B-6 at 20 feet bgs and Borehole B-19 at 15 feet below ground surface ("bgs"). TPH as oil (TPHo) was identified in several soil samples collected at depths of 2.5 and 6 feet bgs. The average TPHo concentration was 402 milligrams per kilogram (mg/kg) and the median concentration was 130 mg/kg. The sample locations are consistent with access areas for Morton company vehicles. Monitoring Well MW-6 is located in the northeast quadrant of the Site, approximately 75 feet to the north of the referenced location of the USTs. The concentration of TPH as gasoline (TPHg) in Well MW-6 is 77,000 micrograms per liter (ug/L). In August 2003, toluene and xylene were present in Well MW-6 at concentrations of 1,400 ug/L and 25,100 ug/L, respectively. The concentration of ethylbenzene in August 2003 was 10,000 ug/L. The REDEVELOPMENT AGENCY continues to assess Site conditions. The WATER BOARD shall be informed if or when the facts referred to above change. III. AGREEMENT 3.0 IT IS HEREBY AGREED THAT WATER BOARD will provide review and oversight of the investigation and response activities conducted at and around the Site by the REDEVELOPMENT AGENCY. The REDEVELOPMENT AGENCY, through its employees, agents and assigns, shall prepare site investigation documents and cleanup and remedial actions plans and implementation documents and submit them to the WATER BOARD for comment and/or approval. The REDEVELOPMENT AGENCY shall implement clean up or remedial action plans, once approved by the WATER BOARD, to remedy releases of hazardous 3