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LEDGROUNDWATER <br /> TECHN G <br /> 0 LO `Y� INC' 4057 Port Chicago Highway,Concord.CA 94520 015)671-2387 <br /> FAX:(415)685-9148 <br /> September 30, 1991 <br /> Job No. 020301211 _ <br /> Mr. Steven K. Schneider f'i�!ii fill i.'�'�. ':' <br /> 04A <br /> Public Health Services <br /> San Joaquin County l IY,){3LJ <br /> P.O. Box 2009 <br /> 445 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 reap 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, 1991 <br /> sampling as follows: <br /> • Xylene at 0.9 ppb <br /> • TPH-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-as-gasoline at 10 ppm {TPH 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 (MGL) for xylene is 1,750 ppb (22 CCR 64444.5). Despite the fact <br /> that the reported results are far 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 /> 093ODS 1.SOU <br /> Offices throughout the U.S..Canada and Overseas <br />