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I shallow aquifer underlying the site is composed of silty and sandy sediment and the local depth to groundwater is about 12 to 13.feet below the surface. Soil and groundwater samples were collected and analyzed only for TPHD since previous analysis had shown that gasoline and related fuel compounds had not been detected.I, TPHDdissolved concentrations were relatively low in groundwater. Boring B-6 drilled ad acent to Boring B-2 showed only 170 Ug/1 (compared to 33,000 Ug/1 at B-2 in 2003) a significant decrease. The laboratory reported that the TPHD was higher boiling than typical diesel fuel. Inour opinion a large contaminant problern is not indicated from this data, and only a small dissolved residual and possibly degraded TPHD plume is present. Wright does not .recommend further work at this time, and proposes that this site should be considered for no further action warranted for"site closure"at this time. 8.0 Limitations This report has been prepared specifically for the City of Tracy Wastewater Treatment Plant Site at 3900 Holly Boulevard in Tracy, CA and was performed 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. 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 City of Tracy, our Client.. This report shall-not be relied upon by or transferred to any other party, or used for ,an other er . . PurPose without the express writtenauthorization of ourlient, and WrightWnht Environmental Services Inc. ght v' ronmental Services, Inc. is not responsible forerrors neither in. laboratory analysis a d reporting, nor for information not available, nor unreported or unknown sources of site contamination during the course of the study, and no warranty or guarantee is expressed or implied therein. If you have any questions,please call or write: Sincerely, - - a�1AL Wright Environmental Services,Inc. y�� { (dry �'ry ��4j`l f 4 CiLfi(,.. fF�62 S�`� it/i ( �F' V - L• l//GU(-"i,'L f 11 t''��F I4r'-D °-J j John Lynch ` 111 g t f�iasFwl t:fiaG !' Christopher 1v1. Palmer S, President C. E. G. 1262 Attachment: Figure 1. Location.Map and 2000-foot Well Search Radius Figure 2. Exploratory Boring Locations Figure 3. Geologic Cross Section Figure 4. Groundwater Chem.i.cal.Data Oct. 28, 2008 I Page 6 of 9 I I