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' 06 August 2004 AGE-NC Project No 95-0128 Page 2 of 11 ' the site to the City of Stockton discharge line located in Rose Mane Lane A diagram of the remediation system is provided on Figure 2a ' Based on effluent flow meter readings (Table 1), approximately 288,091 gallons of treated water were extracted and discharged to the City of Stockton sewer system during the last quarter of 2003 and the First Quarter of 2004 under City of Stockton Public Works Department(SPWD)Industnal Wastewater Discharge Permit No 01 On 01 January 2004, the waste water effluent flow meter calibration required the modification of the meter total settings The rotation (K) factor setting was reconfigured by three percent (3%) The result of the setting change reduced the total waste water ' discharged from 1,660,797 to 1,612,754 gallons, thus creating an offset of the total discharge of 48,090 gallons This value will be added to the total gallons discharged during the reporting interval ' 2 12 Ground Water Extraction System Water Sampling Procedures ' Between September 2003 and May 2004, AGE collected water samples from valved ports located upstream (Influent) and downstream (effluent) of the treatment unit The influent samples were ' . collected in laboratory-supplied 40-milliliter (ml) EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18% hydrochloric acid as a sample preservative, and 1-liter amber bottles without preservative Effluent samples were collected similarly and into 500-milliliter plastic bottles 1 without preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping ' Water sample containers were labeled with the sample designation,date,time,and sampler's initials Subsequently,the samples were logged on a chain of custody form,placed in a chilled container and transported to McCampbell Analytical Inc (MAI) The samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline and as diesel (TPH-g and TPH-d) by EPA Method 8015 Modified, and • Benzene, toluene, ethylbenzene and xylene (BTEX) and the fuel additive methyl tertiary- butyl ether (MTBE) in accordance with EPA Method 8020 or 8260B In addition, to satisfy SPWD Industrial Wastewater Discharge Permit No 01, the effluent water samples were analyzed for pH(150 1),with the April sample analyzed for volatile organic analysis and semi-volatile organic analysis (624/625) and metals (6010) • ' Advanced GcoEnvi ron mental Inc 1