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1C13yt011 d('Roue SERviC[5 ' 4.0 SUMMARY AND CONCLUSIONS Based on the requirements of the PHD/EHD, the fourth quarterly groundwater monitoring event was conducted at the site Groundwater samples were analyzed for TPH-gas, TPH-diesel, BTEX, and MTBE The groundwater samples did not contain TPH-gas, benzene, ethylbenzene, or MTBE above analytical detection limits Concentrations of toluene and xylene(s) were detected in the groundwater sample from MW-2 at concentrations of 0 78 pg/L and 0 87 p.g/L ' respectively and are below the maximum contaminant levels (MCLS) for drinking water for these constituents Concentrations of diesel were detected in groundwater from each of the three groundwater monitoring wells at concentrations ranging from 120 pg/L to 250 pg/L These diesel-range hydrocarbons are within the range detected by analysis in the previous three 2003 quarterly sampling events Based on the limited diesel fuel, ' toluene and ethylbenzene impact in the purge water,we recommend that it be discharged to the local Publically Owned Treatment Works through the onsite treatment system after approval by the PHD/EHD Groundwater flow direction is consistent with the third ' quarter 2003 result The groundwater gradient decreased from 0 0067 feet/feet to 0 0051 feet/feet this quarter when compared with the third quarter of 2003 This groundwater monitoring event concludes the quarterly groundwater monitoring program requirements of the PHD/EHD No MTBE was detected above the laboratory detection limits in groundwater below the site during the past four quarterly monitoring events, demonstrating that no significant migration of fuel-related compounds is occurring On behalf of the Learner Company, we request the PHD/EHD require no further action for the groundwater at the site Following issuance of a"No Further ' Action" letter by the PHD/EHD, the Learner Company will abandon the wells in accordance with the project workplan 1 ' 3 S\Proj\P02263\Q4 Rpt doc