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WESTERN 1186 EAS I BYAMLR 5"1 RLL1 <br /> J <br /> GEO-ENGINEERS WOODLAND CA 45776-fi0U3 <br /> (530) 668-5300, <br /> CALIF CONI RAC l OR#513857 I AX(530)662-0273 <br /> REGISITRED GEOLOGIST S Wege[a mothu com <br /> Mr John Margowsk.i May 26 , 1998 <br /> Wickland Properties <br /> P.O Box 13648 <br /> Sacramento, California 95853-4648 <br /> (916) 2485, FAX (916) 978-2428 <br /> RE Update Status Report #51, March 1998 Quarterly for former Regal Station #603, 6425 <br /> Pacific Avenue, Stockton, California <br /> Dear Mr Margowski <br /> INTRODUCTION <br /> This update, STATUS REPORT 451, presents data collected from Deceiuber 22, 1997 through <br /> March 31, 1998 and includes the Quarterly Groundwater Sampling, Vapor Extraction System <br /> Monitoring and Venting of MW8 <br /> A previous report (CONFIRMATION OF THE EFFECTS OF THE VAPOR EXTRACTION <br /> SYSTEM, for this site, dated July 31, 1997) documented our findings from the soil boring samples <br /> obtained to confirm the effectiveness of the operating; Vapoi Extraction System (VES) <br /> Drilling/Sampling occurred on June 4 and 5, 1997 Four borings (5134, SI35, S136 and S137) were <br /> drilled and sampled Soil sample results from these boring showed a complete iemoval of Benzene <br /> and Toluene, better than 97% reduction in TPHg and better than 90% reduction in Xylenes, see <br /> Table 2 One of these borings (S137) was converted into a two inch vapoi extraction/sparging well <br /> and renamed MW13 Testing for the bio-receptors Dissolved Oxygen (02), Sulfate (SO4), Nitrate <br /> (NO3) and Ferrous Iron (Fe2) was performed during the December 1997 quarterly further documents <br /> the effectiveness of the vapor extraction system maintaining the aerobic conditions at this site As <br /> requested by San Joaquin County Health the Oxygenants were sampled for all wells All wells were <br /> below the laboratory lower detection limits with the exception of MW1 1, which contained 30 ug/L <br /> MIRE <br /> LABORATORY LOWER DETECTION LIMITS FOR OXYGENANTS <br /> t-Butanol (TBA) 100 ug/L Mcthyl-t-butyl ether (MTBE) 5 ug/L <br /> Di-isopropyl ether (DIPE) 5 ug/L Ethyl-t-butyl ether (L-TBE) 5 ug/L <br /> t-Arnylmethyl ether(TAME) 5 ug/L <br /> MW-2 had elevated lower detection limits due to high levels of non-target compounds (TBA 10000 <br /> ug/L, MTBE 500 ug/L, DIPE 500 ug/L, ETBI; 500 ug/L and TAME 500 tig/L) <br /> . Groundwater saInples obtained for the December 1997 Quaitcrly sampling were Cross contaminated <br /> by the submersible pump used to collect repiesentative Dissolved Oxygen samples These samples <br /> 1 8603 Update#51 5/98 <br />