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SIERRA ANALYTICAL <br /> GHH Engineering,Inc. ELAP No.: 2320 <br /> 11960 Heritage Oak Place,Suite 2S Date Sampled: 07]29/02 <br /> Auburn, CA 95603 Date Received: 08/01/02 <br /> Date Prepared: 08/01/02 <br /> Date Analyzed: 08/01/02 <br /> Sierra Project No.: 0208-003 Analyst: MW <br /> C11ent Project ID: USA 45007 Stockton <br /> Sample Matrix: Water Report Date: 08/05/02 <br /> Total Volatile Petroleum Hydrocarbons(TVPH)by GCIFID <br /> Preparation Method: Purge&Trap(EPA Method 50305) <br /> Analysis Method EPA Method 8015B Gasoline Range Hydrocarbons (C4-C12) <br /> TPA Concentration Dilution Surrogate % PQL <br /> Sierra Sample No : Client Sample No.: (pg/L) Factor Recovery (ILgIL) <br /> 15878 MW-1 250 1 114 50 <br /> 15879 MW-1P ND 1 89 50 <br /> 15880 MW-2 ND 1 96 50 <br /> 15881 MW-2P 780 1 125 50 <br /> 15882 MW-3P 63 1 93 50 <br /> 15883 MW-5P ND 1 90 50 <br /> 15884 MW-6P ND 1 88 50 <br /> Quality Assurance I Quality Control Data <br /> C Reference No • 020801-15871 <br /> LCS LCS Spike Spike Dup Spike RPD RPD <br /> l .. 1Analytes: %Ree. C Lists %Rec %Rec C LInuts C Lirmts <br /> Gasoluie 96 $0- 120 97 91 50- 150 6 5 0-30 <br /> ND means Not Detected <br /> Reporting LiTmi(RL)_+Practical Quantttation Limit(PQL)x Dilution Factor <br />