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v o <br /> • A S S O C I A T E S I N C <br /> During the last monitoring event only TPHg was present in the groundwater in two <br /> monitoring wells, all other constituents were reduced to nondetectable levels Mass <br /> balance calculations show only approximately 1 7 pounds of dissolved TPHg impacting <br /> the saturated zone Based on depth to groundwater, the low concentrations of TPHg <br /> present in groundwater, and distance to receptors, the subject site does not appear to <br /> represent a significant risk to human health and the environment <br /> Human exposure to the dissolved groundwater plume is unlikely unless an on-site <br /> shallow well is used for drinking water purposes or groundwater is encountered during <br /> any site excavation deeper than five and a half feet <br /> Appendix B of the Tri-Regional Board's recommendations checklist of required data for site <br /> closure of USTs has been completed, as appropriate The checklist is included in this report as <br /> Attachment 1 <br /> 7.0 CONCLUSIONS <br /> Findings of our evaluation concluded that the project site does not appear to represent a <br /> significant risk to human health and the environment Based on the available data, on behalf of <br /> Mr John Gemelos, ATC formally requests NFA for this site Upon concurrence by PHS/EHD, <br /> ATC will submit a workplan and permit applications for monitoring well destruction <br /> If you have any questions or require additional information regarding this report, please contact <br /> us at (209) 579-2221 <br /> Respectfully submitted, <br /> ATC Associates Inc <br /> Ain Sellman <br /> Staff GeologistW� ' <br /> es r <br /> Jeanne Hornsey, P E ' <br /> Registered Engineer No C47410 <br /> cc Mr John Gemelos, Owner <br /> Mr John Kluve <br /> Mr Marty Hartzell, RWQCB <br /> • <br /> W 192054 00025c1osure-addendum.doc 6 <br />