SITE INFORMATION AND CORRESPONDENCE

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.� California Reg'fonal Water Quality Antrol Board vCentral Valley Region K Robert Schneider,Chair Winston H.Hickox Gray Davis Secretaryfor Sacramento Main Office r�, �)(� 1Governor Environmental Internet Address: http://www.swrcb.ca.gov/-rwgeb5 IJ\\I/ P U Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 1117 LLII LLL"`�n LJ V lh� Phone(916)255-3000•FAX(916)255-3015 FEB 14 2001 13 February 2001 ENVIRONNiEN I HEALTH CERTIFIED MAIL PERMIT,/SERVICES 7000167000006997-3627 Brad Frahm Siebold Corporation 5835 East Cherokee Road#98 Stockton, CA 95215 REQUEST FOR WORK PLAN, SIEBOLD CORPORATION 820 SOUTH AMERICAN STREET, STOCKTON, SAN JOAQUIN COUNTY From 1990 to 1997, the San Joaquin County Environmental Health Division (County) has made numerous requests to you to investigate and clean up the petroleum hydrocarbon contamination related to the former underground storage tanks (USTs) on the Siebold Corporation property. The County's last correspondence to you, dated 9 January 1997, requested you to submit a plan of work to perform a soil and groundwater investigation by 24 January 1997. Your reply letter to the County on 23 January 1997 stated that you would"move forward on the resolution of this project" starting the week of 27 January 1997. To date, neither the County nor this office has received a plan of work to complete the requested investigation and cleanup. Therefore, based on your recalcitrance and non-compliance with their numerous requests, the County has referred this site to the Regional Board for regulatory oversight and enforcement. Based on our file review, we show that three gasoline USTs (8,000, 2,000, and 1,000 gallon), dispensers, and ancillary piping were removed from the site between May 1989 and September 1990. Four soil borings were completed in January 1993, and the maximum soil contamination, identified in a sample at 20 feet below ground surface (bgs) near the former 2,000-gallon UST, contained total petroleum hydrocarbons as gasoline (TPHg) at 693 milligrams per kilogram (mg/kg), and benzene at 54 mg/kg. A groundwater grab sample collected in April 1993 identified TPHg at 14,000 micrograms per liter(µg/1), and benzene at 20,000 µg/1. The depth to water was reported at 55 feet bgs. In April 1997, one monitoring well was installed, and subsequent sampling indicated 52,000 µg/1 TPHg, and 46 µg/1 benzene. To our knowledge, no additional soil or groundwater investigative work has been completed at this site since April 1997. Based on the contamination identified at your site to date, a complete soil and groundwater investigation is required. By 2 April 2001, submit a plan of work to this office to delineate the lateral and vertical extent of contamination at your site. The plan of work must be prepared California Environmental Protection Agency 0 Recycled Paper The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.sweb.ca.gov/mqcb5