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STATE OF CALIFORNIA—ENVIRONMENTAL PROTECTIGGENCY PETE WILSON,Governor <br /> DEPARTMENT OF TOXIC SUBSTANCES CONTROL <br /> '7151 CROYDON WAY,SUITE 3Zak <br /> SACRAMENTO,CA 95827-2106 <br /> (916) 255-3545 <br /> D[C 2 8 1992 <br /> December 23, 1992 tNVIR ,Nt1iriY 1-M <br /> 4643 ., <br /> TER N1'ff/SERVKL4, <br /> { <br /> s <br /> Mr. Michael Walker <br /> Director of Construction <br /> Renown Enterprises, Incorporated. <br /> 4145 Blackhawk Plaza Circle, Suite 101 <br /> Danville, California 94506 <br /> SITE STATUS OF THE PROPERTY AT THE CORNER OF TRACY BOULEVARD AND <br /> BEECHNUT AVENUE, TRACY, CALIFORNIA <br /> Dear Mr. Walker: <br /> This letter summarizes activities for the site owned by <br /> Renown at Tracy Boulevard and Beechnut Avenue in Tracy, <br /> California. This summary includes the conclusions from the <br /> Preliminary Endangerment Assessment completed in September 1990 <br /> and the Stockpile Grading and Soil Investigation Report, <br /> July 1992 . Also summarized is the discussion between the <br /> Regional Water Quality Control Board (Board) and the Department <br /> of Toxic Substances Control (Department) regarding ground water <br /> issues at the site. <br /> The Preliminary Endangerment Assessment (PEA) concluded that <br /> soils on-site and the shallow aquifer under the site are <br /> contaminated with crude oil as a result of the site previously <br /> being used as an oil storage and transfer station. Soil and <br /> ground water samples had elevated levels of total petroleum <br /> hydrocarbons (TPH) . Based on the results of previous soil and <br /> ground water investigations at the site, it was determined that <br /> polynuclear aromatic hydrocarbons (PAH) compounds, present in low <br /> levels in site soils as a trace constituent of the oily waste, <br /> are the chemicals of concern. The results of the risk assessment <br /> completed with the PEA estimated the risks to construction <br /> workers and residents to be low based on limited contact with <br /> on-site soils. A soil cleanup level of 20, 000 parts per million <br /> (ppm) was proposed based on information in the risk assessment. <br /> The Department did not concur with that level and proposed a soil <br /> clean up level of 800 ppm. This issue has not been resolved. <br /> Additional sampling completed in June 1992 defined the <br /> extent of the contamination. The "Stockpile Grading and Soil <br /> Investigation Report" (Report) specified the source of the <br /> contamination on-site and concluded that the contaminant, <br />