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TABLE 5 Analytical Parameter Summary ARCO Service Station No 5469 130 South Wilson Way,Stockton,California Distance to Ferrous Total heterotrophic. Nitrate Sulfate Sulfite Phosphate Well nearest COD' DO' ORP' iron° iron 5 plate count 6 TOC T as NO3 8 as SO,' as SOS 9 (Ortho)as P a TDS u Number Date injection well - /L m /L m CFU/ml m /L m /L /L m /L /L m /L I NOTES i COD was analyzed using EPA Method 410 4 lig/L=mmcrogtarrs per liter QA/QC Review 2 Dissolved oxygen(DO)was analyzed using EPAMethod 360 1 NA=Not analyzed A=Data accepted without qualification 3 Oxidation reduction potential(ORP)was analyzed using ASTM D1499 76 7—Data accepted with qualification 4 Fearos iron was analyzed usmgHach Method 8146 NS=Not sampled R=Data re3ected 5 Total iron was analyzed using EPA Method 200 7 NP=Not Purged e Heterotrophic plate count was conducted using SM 9215 S <—Below detection limit for the analytical methods used Total organic carbon was analyzed using SPAMethod 415 1 eNitrite,nitrate,sulfates and phosphates were analyzed using EPAMethod 300 0 9 Sulfite was analyzed using EPAMethod 377 1 L'Total alkalinity was analyzed using SM 232013 tt Total solids were analyzed usmgEPAMethod 160 1 [1]The sample was analyzed beyond the EPArecoirmaended holding time [2]The incubation was perforined at 35 degrees C for 48 hours with plate count agar [31 The sample was received beyond the EPArecoinTrnded holding time I [4]This sample was analyzed beyond the FPA recorrmend hold tune(8 hrs) The sample was kept on ice at 5 degrees C and analyzed within 24 hours of sample collection [5]This sarTle was prepared outside the 8 hour recommended holding time for this analysis [6]Sample result maybe biased high Matnc spike and matrix spike duplicate recoveries exceed upper control hints [7]San ple result maybe biased low Matrix spike duplicate recovery exceeds lower control limit Matrix spike recovery was within control lumts [S]Reported results may he biased low since the analyses for these analytes were performed beyond the US EPA recommended holdingtrme (9]The method blank contains this analyte at a concentration above the reporting limit however the concentration is less than 5%of the sample result which is negligible according to method criteria [101 The reporting liiitlt for this analyte has been raised to account for matrix interference [1 l]The concentration indicated for this analyte is an estimated value above the calibration range of the instrument [12]Con6rnntory analysis was past EPArecominended holding time [13]This sample was originally analyzed within the EPA recornmended hold time Re-analysis for confirmation or dilution was performed past the recommended hold time The result train the initial analyses are reported in the Table [14]Reported results may be biased high since the analyses for these analytes were performed beyond the US EPA recommended holding time (15]Reported result should be considered estimated since the analyses were performed beyond the US EPA recommended holding tune 161 Reported resutt may be biased low as indicated by a low average percent matrix spike recovery reported in the associated MS/MSD analysis {17]The reported result may be estmnted since the analyses for these analytes were perforated beyond the USEPA recomr mended holding time 1,18]The reported result may be biased since the analyses for these analytes were performed beyond the US EPArecorrarrended holding time [19]The reported result should be considered estimated due to a lugh relative percent difference reported between the primary and laboratory duplicate samples 5T�4Tl1S Arco 5469 O&M Data - - - 6of6