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SEQUOIA ANALYTICAL <br /> 819 Striker Avenue Suite 8 Sacramento, CA 95834 <br /> (916) 921-9600 FAX (916) 921-0700 <br /> ESNA Industnes u A` Clierit Project 10' ' 38009 09/City of Stockton <br /> 164 Gold Camp Dr, Suite 200 Matrix Air <br /> Rancho Cordova, CA 95670 <br /> Attention Jay Johnson OC Sample Group 4010570-576 Reported Jan 21, 1994 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl- <br /> Benzene Toluene Benzene Xylenes <br /> tMethod.- EPA 8020 EPA 8020 EPA 8 0 <br /> 020 EPA 802 <br /> Analyst: Chiaravalloti Chiaravalloti Gniaravalim Chiaravailoa <br /> Concentration 20 20 20 80 <br /> Spiked: mg/cubic m mg/cubic m mg/cubic m mg/cubic m <br /> ' LCS Batch#: BLK012094 BLK012094 BLK012094 BLK012094 <br /> Date Prepared: 1/20/94 1/20/94 1/20/94 1/20/94 <br /> ' Date Analyzed: 1/20/94 1/20/94 1/20/94 1/20/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS sib <br /> Recovery: 115 110 110 112 <br /> Control Limits: 75-125 75-125 75-125 75-125 <br /> ' MS/MSD <br /> Batch#: BLK012094 BLK012094 BLK012094 BLK012094 <br /> Date Prepared: 1/20/94 1/20/94 1/20/94 1/20/94 <br /> Date Analyzed: 1/20/94 1/20/94 1/20/94 1/20/94 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> ' Matrix Spike <br /> % Recovery: 115 110 110 112 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery- 105 110 105 105 <br /> ' Relative% <br /> Difference 91 00 47 6 5 <br /> ' SEQUOIA ANALYTICAL Please Note <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> C�fpreparation and analytical methods employed for the samples The LCS%recoverydata:s used for <br /> validation ofsample batch results Due to matnx effects,the OC limits for MS/MSD's are advisory only <br /> fn�a <br /> Schneider and are not used to accept or reject batch results <br /> Project Manager <br /> ' 4010570 RES a3> <br />