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�BLIC H ALTH SERVIC�S oP �o <br /> SAN JOAQUIN COUNTY a <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 4GIFO RN\ <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202 <br /> 209/468-3420 tt <br /> PAUL SUPPLE //\/�' �C�) <br /> ARCO PRODUCTS CO \`_J <br /> P O BOX 6549 <br /> MORAGA CA 95470 FEB 112000 <br /> RE: ARCO Station #4932 SITE CODE: 1136 <br /> 16 E. Harding Way <br /> Stockton CA 95204 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the "Soil Sampling during UST, Product Line, and Dispenser Removal <br /> Activities" dated December 10, 1999 that was submitted by SECOR International Inc. <br /> (SECOR) on behalf of the above referenced site and has the following comments. <br /> Three underground storage tanks (UST) associated piping and dispensers were <br /> removed under permit and inspection from this site between May 25, 1999 and June 9, <br /> 1999. Soil samples for analysis were collected and results indicated that contamination <br /> by petroleum hydrocarbons had occurred in both the former tank pit and dispenser <br /> island areas. Limited over-excavation of both impacted areas was performed on June 9, <br /> 1999. Analytical results from the soil samples collected under the dispenser island area <br /> following the over-excavation showed increasing levels of contamination to 8.5 feet <br /> below surface grade (bsg). Over-excavation samples from the tank pit showed <br /> decreasing levels of contamination with depth to nearly all non-detect with the exception <br /> of sample T-3S@19', which had .579 parts per million (ppm) MtBE. <br /> The report recommends that a site assessment be conducted to define the extent of <br /> hydrocarbons in soil beneath the site. PHS/EHD concurs with this recommendation. <br /> Please prepare a work plan to begin the investigation of the vertical and lateral extent of <br /> the documented petroleum hydrocarbon contamination at this site and submit it to <br /> PHS/EHD by April 14, 2000. <br /> If you have any questions or comments please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> % <br /> Lori Duncan, Senior REHS Margar Lagono RHS <br /> LOP/Site Mitigation Unit IV Supervisor, Unit IV <br /> cc: Marty Hartzell, CVRWQCB <br /> Rusty Benkosky, SECOR <br /> A Division of San Joaquin County Health Care Services <br />