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PUBLICS HEALTH SEkVICES <br /> SAN JOAQUIN COUNTY ' <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer �`�... <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 iii 60 <br /> 2091468-3420 <br /> PAUL VERMA AUG 2 0 2001 <br /> CITY OF TRACY <br /> 520 TRACY BLVD <br /> TRACY CA 95376 <br /> RE: Boyd Service Center SITE CODE: 1421 <br /> 560 Tracy Blvd <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the file for the above referenced site and has the following comments. <br /> In August 1995 an unauthorized release of petroleum hydrocarbons was discovered at <br /> this site during a product line upgrade. A work plan to investigate the extent of this <br /> release was submitted to PHSIEHD in April 1998 and was approved in May 1998, but <br /> was never implemented. <br /> In December 1998 three underground storage tanks (UST's)were removed from this site <br /> under permit and inspection by PHSIEHD. Tanks #1 and #2 were 8,000 gallon UST's <br /> storing gasoline and tank#3 was a 5,000 gallon UST storing diesel fuel. Analytical <br /> results of samples collected from beneath the three UST's and their associated <br /> dispenser islands were positive for petroleum hydrocarbons at concentrations up to <br /> 4,700 milligrams per kilogram (mg/kg) total petroleum hydrocarbons as gasoline (TPHg), <br /> 1,200 mg/kg TPH as diesel, 460 mg/kg xylene and 2.3 mg/kg methyl tertiary butyl ether <br /> (MtBE) in the soil. The grab groundwater sample from the bottom of the tank pit was <br /> reported to contain 16,000 micrograms per liter (µg11) TPHd, 300 pg/i TPI-Ig and 1,400 <br /> µg11 MtBE. <br /> A second work plan to investigate the documented contamination at this site was <br /> submitted to PHSIEHD in January 1999. The work plan proposes to begin the <br /> investigation of this site with a series of soil borings to collect soil and grab groundwater <br /> samples, followed by the installation of three shallow groundwater monitoring wells. The <br /> work plan is approved with the following conditions: <br /> 1) Revised analytical data tables that include the TPHd results from the tank pull <br /> samples must be submitted to PHSIEHD. <br /> 2) A target total depth for the soil borings must be submitted in writing to <br /> PHSIEHD. <br /> A Division or San Joaquin County Health Care Services <br />