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ISo0210 11 <br /> Department of Toxic Substances Control <br /> Alan 0.Lloyd,Ph.0. 8800 Cal Center Drive AmoVl SGrnarzenapeer <br /> AMncyseaeury Sacramento,California 95828.3200 Govemw <br /> CeVEPA <br /> February8, 2005 <br /> Mr.Tracy Sizemore <br /> ConcocoPhillips <br /> 1500 North Priest <br /> DC-40A <br /> Tempe,Arizona 85281 <br /> Mr. Thomas Bauhs <br /> Chevron Texaco Environmental Management Corporation <br /> P.O. Box 8012 <br /> Sen Ramon, Callfomia 94583-0804 <br /> HEALTH RISK'ASSESSMENT DATA NEEDS PRIOR TO SOIL VAPOR EXTRACTION <br /> SYSTEM STARTUP,AND OVERALL HEALTH RISK ASSESSMENT DATA NEEDS <br /> SYSNOPSIS, L&M OU, STOCKTON, CALIFORNIA <br /> Dear Mr. Sizemore and Mr. Bauhs: <br /> The Department of Toxic Substances Control(DTSC) Human and Ecological Risk <br /> Division(HERD) has completed a synopsis of the comments contained In their <br /> memorandum dated'September 9,2004,to assist with progressing towards an <br /> acceptable Health Risk Assessment(HRA). HERD's synopsis and Data Gaps table Is, <br /> attached to the enclosed memorandum dated February 2, 2005(enclosure). Based <br /> upon a meeting held on January 5,2005 with Regional Water'Quality Control Board <br /> staff, DTSC has identified below a subset of the data needs identified In the anelpsed <br /> February 2,2005 HERD memorandum that should be addressed prior to the startup of . <br /> the Soil Vapor Extraction (SVE)system planned for the Delta View Apartments <br /> (formerly known as Delia Gateway Apartments).and startup of the SVE system in the <br /> undeveloped efes of the L&M CU. <br /> ADDITIONAL DOCUMENTATIONIDATA•NEEDED poor to SVE system startup: <br /> Buliat 1 from enclosed memorandum forthe Delta View Apartment area. If <br /> -underground utility infomtation Is available based upon'Installation of the SVE <br /> system under the apartment area,it should be provided. DTSC recommends <br /> contacting the City of Stockton Department of Public Works for Wrrent.maps <br /> depicting locations of underground utilities such as sewer and water pipes, <br /> 0 Primed on Reoyrlpd Paper <br />