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a c <br /> PUBLIC tEALTH' SER$10ES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> RICK HENRY <br /> LLNL AUG 0 4 1994 <br /> P O BOX 808 L-633 <br /> LIVERMORE CA 94550 <br /> RE: LLNL - SITE 300 <br /> UST REMOVALS - BLDGS #834 & 871 <br /> This letter will confirm our telephone conversation of Tuesday, August 2, 1994 relative to the above <br /> referenced underground storage tank (UST) removals. <br /> UST REMOVAL - BUILDING #834 <br /> 1 have spoken to Susan Timm of the Central Valley Regional Water Quality Control Board (RWQCB) <br /> specifically about regulatory oversight of the UST remediation due to the contaminant commingling of <br /> TCE and diesel in a nearby monitoring well. San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) will continue to provide regulatory oversight on the <br /> remediation of the UST removal. <br /> Ms. Timm and I have no objections to the LLNL's plan of filling the tank excavation with clean, <br /> compacted soil and the installation of 3 vadose extraction wells. I am forwarding to you two copies of <br /> PHS/EHD's "Well Standards" so that your consultant may refer to the document when designing the <br /> construction of the vadose extraction wells. <br /> Groundwater elevations and water quality data may be obtained in nearby TCE monitoring wells within <br /> a distance of 50 - 100 feet preferably downgradient of the former tank location. <br /> The field activities, laboratory analyses, and vapor extraction data shall be compiled into a "Preliminary <br /> Site Assessment' report within 90 days from the date of this letter. <br /> UST REMOVAL - BUILDING #871 <br /> As we discussed, the LLNL should consider a remedial action appropriate to the contaminant <br /> disposition. Several options may be available to you i.e., excavation and removal of the petroleum <br /> hydrocarbons and confirmatory excavation sampling; in-situ treatment followed by confirmatory soil <br /> sampling; or no action derived through a calculated mass balance of the contaminant utilizing solubility <br /> and/or contaminant mobility also referred to as risk assessment and/or chemical transport modeling. <br /> Due to the site's ongoing public information activities related to the environmental cleanup being <br /> conducted at Site 300 under the federal Superfund program, the corrective action requirements of <br /> Article 11 of the California Code of Regulations, Title 23, Division 3, Chapter 16 may be modified. <br /> A "Preliminary Site Assessment" report shall be submitted to PHS/EHD within 90 days from the date of <br /> this letter detailing the work completed following the tank removal and the suggested remedial action. <br /> A Division of San Joaquin County Health Care Services <br />