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Ado 30 October 1996 AGE-NC Project No. 95-0105 Page 3 of 4 4.0. CONCLUSIONS AND RECOMMENDATIONS 4.1. CONCLUSIONS Based on data collected from the site, AGE has come to the following conclusions: • Between May and August 1996, concentrations of TPH as gasoline and BTE&X decreased LW at the site. • Concentrations of TPH-d had increased in monitoring wells MW-1, MW-2, MW-3 and MW-5 and TPH-d concentrations decreased in the samples collected from well MW-4, "" between May and August 1996. • The apparent down gradient extent of the petroleum hydrocarbon-impacted ground water has +� been defined. Monitoring well MW-5 represents the northeastern limit of the dissolved hydrocarbon plume; well MW-6 represents the northern limit of the hydrocarbon impacted ground water. • The decrease of petroleum hydrocarbons in well MW-4 may be the result of the drop of ground water elevation, or may indicate that the dissolved hydrocarbon plume is moving �.�-- away from the well. However, according to Mr. Steve Sasson of the PHS-EHD, petroleum hydrocarbons have not been detected in a well located approximately 90 feet northwest of well MW-4 on the City of Tracy Fire Department Property. w 4.2. RECOMMENDATIONS ° Based on present site conditions, AGE has the following recommendations: • A Corrective Action Plan(CAP) including field feasibility studies should be completed for the site to determine if active ground water remediation will be efficient and cost-effective. LN Field pilot studies for various remedial alternatives should be included in the CAP. An estimation of the effectiveness of natural attenuation of dissolved hydrocarbons should be included in the CAP. 4 • A receptor survey should be included with the CAP. • The next quarterly monitoring should be scheduled for November 1996.