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' SEQUOIA ANALYTICAL <br /> 819 Striker Avenue, Suite 8 9 Sacramento, CA 95834 <br /> (916) 921-9600 * FAX (916) 921-0100 <br /> ........... .. .... <br /> AESNA'1hd­u .... .... <br /> I- Client P ro je.ct­ID':' Sto""P*132," Stockton ..... <br /> itHe's <br /> 3164 Gold Camp Dr., Suite 200 Matrix: Water <br /> Rancho Cordova, CA 95670 <br /> Attention: Rich Garlow QC Sample Group: 3060793-797 Reported: Jun 25, 1993 <br /> .......... <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Ethyl <br /> Benzene Toluene benzene xylenes <br /> 16'w <br /> Method: EPA 8020 EPA 8020 EPA 8020 EPA 8020 <br /> Analyst: C.Chapman C.Chapman C.Chapman C.Chapman <br /> Concentration 10 10 10 30 <br /> Spiked: ug/L ug/L ug/L ug/L <br /> LCS Batch#: LCS062493 LCS062493 LC8062493 LCS062493 <br /> Date Prepared: 6/24/93 6/24/93 6/24/93 6/24/93 <br /> Date Analyzed 6/24/93 6/24/93 6/24/93 6/24/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> LCS % <br /> Recovery: 99 99 99 100 <br /> Control Limits: 80-120 80-120 80-120 80-120 <br /> ............ <br /> ........... ........ . . . ...... ............ <br /> XX7 ........................... ................ <br /> ............. <br /> ................. <br /> MS/MSD <br /> Batch#: 3060793 3060793 3060793 3060793 <br /> Date Prepared: 6/24/93 6/24/93 6/24/93 6/24/93 <br /> Date Analyzed 6/24/93 6/24/93 6/24/93 6/24/93 <br /> Instrument I.D.#: HP-2 HP-2 HP-2 HP-2 <br /> Matrix Spike <br /> % Recovery: 100 100 100 90 <br /> Matrix Spike <br /> Duplicate% <br /> Recovery: 90 90 90 90 <br /> Relative% <br /> Difference: 10 10 10 0.0 <br /> Please Note: <br /> The LCS is a control sample of known,interferent free matrix that is analyzed using the same reagents, <br /> SEQUOIA ANALYTICAL preparation and analytical methods employed for the samples. The LCS%recovery data is used for <br /> validation of sample batch results. Due to matrix effects,the OC limits for MS/MSD's are advisory only <br /> and are not used to accept or reject batch results. <br /> 04ndy Amundsen <br /> Laboratory Director 3060793.RES <2> <br />