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I 14 February 2005 AGE-NC Project No 95-0128 Page 2 of 6 I In preparation for treatment additional ground water quantities,ground water discharge flow greater than 2 GPM,AGE replaced the GAC media The media change out occurred on 29 November 2004 to prevent a discharge and allow for enhanced flow through the adsorption media, which had been Utilized for three years and was experiencing high back-pressure A diagram of the remediation system is provided on Figure 2a In early October 2004,AGE began the utilization of extraction well EW-2, which produced higher volumes of groundwater than well EW-1 EW-1 was producing approximately 5 GPM for no longer than one-minute prior to faulting, which prevents over-amperage damage to the motor AGE has I attempted to install a pneumatic driven, low-flow pump in well EW-1, however excessive well siltation/sanding has occurred to the well The extraction well EW-1 was installed to a total depth of 45 feet bsg, which currently had screen exposed to approximately five feet of silt at the lower portion of the screen and two to three feet of sand and gravel above the lower silt contact documented at 40 feet bsg A re-development of the well will likely be required to collected the excessive sand generated during water extraction Based on effluent flow meter readings (Table 1), approximately 230,860 gallons of treated water were extracted and discharged to the City of Stockton sewer system during the third and fourth quarters of 2004 under City of Stockton Public Works Department(SPWD) Industrial Wastewater Discharge Permit No 01 On 13 October 2004, the waste water effluent flow meter required a change of the internal batteries and the meter total was re-set at zero This value will be added to the total gallons discharged during the reporting interval I2 12 Ground Water Extraction System Water Sampling Procedures Between May and December 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 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 Cal T ech Environmental Laboratories (CTEL) a State of California Department of Health (DHS)-certified analytical laboratory 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 IAdvanced GeoEnvironmental,Inc I