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S E C 0 R • Additional Site Assessment and Site Conceptual Model 7-11 Store#14117 September 30, 2005 Page 10 A formal 2,000 foot sensitive receptor investigation was conducted in May 2001 by ETIC Engineering, Inc , for the adjacent former Exxon Retail site 7-3708 at 2705 Country Club Boulevard (SHAW, Work Plan for Additional Offsite Assessment, Fate and Transport Evaluation Addendum, Sensitive Receptor Survey, and Fourth Quarter 2002 Monitoring and Sampling, January 30, 2003) The survey included the results of a 1,000 foot radius door- to-door well survey A single domestic well was identified at 2740 Bristol Avenue, approximately 900 feet northwest of the 7-Eleven site An Environmental Data Resources Survey (EDR) included in the ETIC survey reported no federal, state, or public water supply wells within one mile of the site The results of the Flour Daniel GTI well search, the formal 2,000 foot sensitive receptor Investigation by ETIC, and the EDR Survey are included in Attachment H 7 0 CONCLUSIONS The site is an operating gas station and convenience store that has been monitored since the third quarter 1999 Groundwater monitoring results indicate that groundwater flow is primarily southeast and northwest with an average gradient of 0 017 feet per foot The vertical limits of dissolved gasoline-range petroleum hydrocarbons, MtBE, and TBA in deep soil and groundwater have not been defined onsite With the exception of 4 0 Ug/L of MtBE in CPT-3 (CPT-3-70') the lateral extent of deep groundwater contamination has been defined to the northeast and east The lateral limits of shallow contamination in soil and groundwater has been defined to the north, west and southwest of the site A single domestic well is located approximately 900 feet northwest of the 7-Eleven site The site, and adjacent properties that are located over the area of sod contamination, are paved with asphalt and concrete, therefore, it Is unlikely that any sensitive receptors will be exposed via ingestion of sod or inhalation of gasoline range petroleum hydrocarbon vapors It is SECOR's opinion that the gasoline present in soil and groundwater has a low probability of affecting potential sensitive receptors Due to difficulties obtaining an access agreement to install proposed monitoring well MW-9 and the existence of subsurface utilities around the proposed location of MW-10, these wells were not installed SECOR is currently working to obtain access agreements with the private property owners to install MW-9 as originally proposed and MW-10 approximately 15 feet southeast of the originally proposed location 8 0 STATEMENT OF LIMITATIONS This SCM is limited in scope and only addresses conditions that generally present a material risk of harm to public health or the environment, and that generally would be the 117-Elevenl7-11 Stores1141171Reports114117 SCM and Additional Assessment doc Page 10