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,1 1. <br /> -- - SEP-30-191 MGN 14:48 I D:GROUNDWATER TECHNOL. TEL NO:415 7913 0702 ##139 P01 <br /> r <br /> I Rua <br /> 11, , <br /> SEP 2 0 1991 <br /> ® GRouNDWATER <br /> ENVIRONMENTAL HEALTH <br /> ❑ TECHNOLOGY INC PERMITISEr�vlcl: <br /> TECHNOLOGY, 4057 Part hicago Highway,Concord)C,184520 1415}871-73$1 <br /> �y FAX:415)695-9148 <br /> September 30, 1991 Post-It's brand fax transmittal memo ml �of p.q.: ► r: <br /> , <br /> o I <br /> o, <br /> Job No. 020301211 <br /> apt. P one# <br /> Mr. Steven K. Schneider •r s <br /> Public Health Services <br /> s _9mAnd Wn County <br /> P.O. Box 2008 <br /> 443 N. San Joaquin Street <br /> Stockton, CA 95201 <br /> RE: SOUTHLAND CORPORATION STORE NO. 20680: 9110 THORNTON ROAD: STOCKTON, CA <br /> Dear Mr. Schneider: <br /> This letter is provided to notify you of the positive analytical results we have received for the Ivy Motel <br /> domestic well (#9172) located up-gradient of the subject site. A map is attached for your review <br /> depicting the location of domestic well #9172. <br /> As you are aware, well #9172 Is sampled monthly as part of the routine monthly domestic well <br /> sampling program, Detectable concentrations of petroleum hydrocarbons have not been detected In <br /> well #9172 since early 1988. Detectable concentrations were reported from the August 26, 1881 <br /> sampling as follows: �_ <br /> • Xylene at 0.9 ppb vua ' `V <br /> ' 'p sk�wvj\ <br /> • <br /> TPI -as-gasoline at 31 ppb <br /> The laboratory results reported below detection limits for benzene, toluene and ethylbenzene. Copies <br /> of the laboratory report are enclosed for your review, <br /> Based on the results of the laboratory analysis, the well was resampled on September 12, 1991. The <br /> results of that analysis confirmed the positive detection of xylene and TPH-as-gasoline as follows: <br /> • Xylene at 0.7 ppb <br /> TPH-se-gasoline at 10 ppm (Tf H detection limit = 10 ppb) <br /> Again, no detectable concentrations of benzene, toluene or ethylbenzene were reported, Copies of the <br /> laboratory report are enclosed for your review. <br /> The maximum contaminant level (INCL) for xylene is 1,750 ppb (22 CCR 64444,5), Despite the fact <br /> that the reported results are for below state drinking water standards, the anomalous appearance of <br /> detectable concentrations of xylene and TPH-as-gasoline in the up-gradient domestic well warrant <br /> reporting, <br /> 0eao021.sou <br /> offiem MrW-4hour rhe U.S..Canada and Otwseas <br />