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7.0 Conclusions and Recommendations Wright has completed the Groundwater Monitoring Well Sampling and Chemical Analysis, 3`d Quarter 2009 was prepared for submittal to the City and EHD and RWQCB Region 5. Well MWWES-1 was sampled for analysis, and four existing monitoring wells (MWHP-5, MWHP-6, MWHP-7 and MWHP-8) were used for groundwater measurements only in order to plot groundwater flow direction. The groundwater elevation contour plot flow showed a northwest flow direction at a calculated gradient of 0.0014. The groundwater sample analysis showed that TPHD, TPHG and BTEX were not detected. The nearby impoundments might contribute to a small groundwater mound near MWWES-1 however the amount of seepage from the impoundments and possible effects upon the shallow aquifer are not known. It is anticipated that this monitoring program will continue pending EHD report review. However the TPHD, TPHG and BTEX were not detected in MWWES-1 and on this basis Wright recommends that it is appropriate begin the site closure process for no further action required (NFAR) at this time. 8.0 Limitations This report has been prepared specifically for the City of Tracy Wastewater Treatment Plant Site at 3900 Holly Drive in Tracy, CA, and was done according to the current State and local agency suggested guidance documents for these investigations. The interpretations, conclusions and recommendations made herein are based on the data and analysis for the soil and water samples collected on-site. Conditions of the property can change over time and the use of this report by third parties is entirely at their own risk. The soil borings/monitoring well/groundwater sampling data can only present information accurately on the area directly at the point of the boring. They give a general indication of the condition of the site, but will not serve as a basis for a guarantee of non-contamination of the site. The conclusions and professional opinions that will be presented are developed in accordance with generally accepted practice as outlined in the guidelines of the California Regional Water Quality Control Board and/or other agencies for soil and groundwater sampling. The chemical analysis results are based on data collected at the sampling locations only, therefore Wright Environmental Services,Inc. cannot have complete knowledge of the underlying conditions. Conditions at the project site will change with time due to natural processes or the works of man. Accordingly, the findings of this report will apply to the present conditions only; the opinions expressed therein are subject to revisions in light of new information, and no warranties are expressed or implied. Please note that reports of contamination must be submitted to the agencies in a timely manner. This report has been prepared for use solely of the City of Tracy, our Client. This report shall not be relied upon by or transferred to any other party, or used for any other purpose, without the express written authorization of our Client, and Wright Environmental Services, Inc. Wright Page 4 of 7