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GeoAnalytical Laboratories, Inc. <br /> 1405 Kansas Avenue Modesto, CA 95351 Phone (209) 572-0900 Fax (209) 572-0916 <br /> 40CERTIFICATE OF ANALYSIS <br /> ` ort# N091-02 Date 4/10/02 <br /> Advanced GeoEnvironmental, lnc Source Date Date Started 4/1/02 <br /> 4/1/02 <br /> 837 Shaw Rd <br /> Stockton CA 95215 Date Completed 4/5/02 <br /> Project Flag City Chevron Date Sampled 3/31/02 <br /> Time 5 OOpm <br /> Sampler <br /> Sample ID• Effluent <br /> Lab ID N303328 <br /> Aquatic Toxicity <br /> Test Type EPA1600/4-90/027F Control 625% 25% 50% 75% 100% <br /> Dilution Water Reconstituted DI Water Initial pH 7 49 7 56 767 7 73 7 79 7 86 <br /> Species Pimephales Promelas (Larval) 4/1102 DO 827 836 8 56 8 71 879 904 <br /> Common Name Fathead Minnow Temp°C 20 5 205 204 205 20 5 205 <br /> Supplier Aqua Tax <br /> Dilution Volume 2000 ml 24 Hrs. pH 744 748 766 7 68 774 783 <br /> ##Fish per Dilution 20 4/2102 DO 740 766 7 92 830 8 51 877 <br /> Dead in Acclimation Tank < 1 % Temp°C 203 203 204 20 4 203 204 <br /> ge Length NA Mortalities 0 0 0 0 0 0 <br /> age Weight NA 48 Hrs. pH 7 41 7 43 763 7 65 7 71 778 <br /> 413/02 D O 6 88 7 45 7 73 808 824 835 <br /> Temp°C 20 0 201 201 202 20 1 20 7 <br /> Mortalities 0 0 0 0 0 0 <br /> Initial Control Hardness 93 72 Hrs pH 7 39 7 39 759 7 64 770 775 <br /> Final Control Hardness 93 414102 DO 659 6 86 7 15 762 786 7 90 <br /> Temp°C 20 4 20 4 203 203 20 3 203 <br /> Mortalities 0 0 0 0 0 0 <br /> 96 Hrs. pH 7 35 7 37 7 56 7 62 767 7 73 <br /> 415102 DO 6 25 649 6 79 727 759 778 <br /> Temp°C 20 2 203 202 20 2 20 2 202 <br /> Mortalities 0 0 0 0 0 0 <br /> Total Mortalities 0 0 0 0 0 0 <br /> Notes <br /> There were no significant mortalities observed Inrthls test <br /> �U <br /> Ramiro Salgad6 Donna Keller <br /> Chemist Certification # 1157 Laboratory Director <br />