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PUBLIC HEALTH SERVICES OA4Ur <br /> o <br /> SAN JOAQUIN COUNTY r <br /> y { <br /> JOGI KHANNA M D M P H <br /> Health Officer <br /> PO Box 2009 • (1601 East Hazelton Avenue) • Stockton, Cakfornia 95201 q<<Ko <br /> (209) 468-3400 <br /> 7 <br /> L2U <br /> JOHN MARGOWSKI <br /> WICKLAND OIL COMPANY <br /> P O BOX 13648 i�AY 21 19PSACRAMENTO CA 95853-4648 <br /> RE Former Regal Station #604 Site Code- 1081 <br /> 1448 North El Dorado Street <br /> Stockton CA 95202 <br /> San Joaquin County Public Health Services Environmental Health Division(PHS/EHD)has completed review <br /> of the following submittals prepared by WEGE which have been recently forwarded to PHS/EHD <br /> "Update Status Report #13, October - November 1992" dated November 24, 1992, <br /> "Update Status Report #14, November - December 1992" dated December 28, 1992, <br /> "Update Status Report #15, December 1992 - January 13, 1993" with "Closure Work Plan" <br /> dated February 9, 1993, <br /> "Update Status Report #16, January 13 - February 23, 1993" dated February 25, 1993, <br /> "Results of Sampling of the Vapor Extraction. System" dated April 7, 1993, <br /> "Results of Sampling of the Vapor Extraction System" dated April 30, 1993 <br /> PHS/EHD has the following comments for your consideration <br /> Groundwater <br /> Groundwater samples were collected from monitoring wells, MW1, MW4, MW5, and MW7 on December 7, <br /> 1992 Only the sample collected from MW5 contained detectable petroleum hydrocarbon contamination, 160 <br /> ppb TPH-gasoline, 12 ppb ethylbenzene, and 35 ppb xylene Samples collected from MWI and MW4 were <br /> not analyzed for TPH-gasoltne Monitoring wells MW2, MW3, and MW6 did not contain sufficient water to <br /> sample <br /> Groundwater samples were collected from monitoring wells on March 30, 1993 To date PHS/EHD has not <br /> received the results of this sampling event The above mentioned work plan proposed the destruction of <br /> monitoring wells, if no contamination is detected during confirmation soil sampling PHS/EHD does not <br /> recommend the destruction of monitoring wells at this time <br /> Soil Vapor Extraction <br /> Vapor samples were collected on Apnl 15, 1993 from VSB3, VSB5, VSB11, and MW5, as well as from the <br /> vapor extraction system's influent and effluent These samples were analyzed on WEGE's portable lab FID- <br /> GC The results indicated that hydrocarbons continue to be removed from the soil at a rate of 8 65 lbs per <br /> A Dmsjon of San joaqutn County Heal[h[ere scmccs �� <br />