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Site Characterization:Clover idle School,51 East Beverly Place, Tracy, CA. Page 8 of the other fuel oxygenates for which analyses were made were detected in any of the soil or groundwater samples. 4.0 CONCLUSIONS As discussed above, the site characterization program described herein found no evidence that groundwater beneath the subject property has been affected by any detectable components of gasoline. Also, none of the soil samples recovered during the site characterization contained any detectable concentrations of components of gasoline. The very low concentration of components of fuel hydrocarbons detected in samples of soil and groundwater from a boring drilled "adjacent to the tank pit" in September 1985 have either been remediated by natural bioremediation and attenuation or are confined to such a small zone of the subsurface that they were not detected in the boring drilled during the investigation reported herein. SJC's investigation included a K boring drilled a short distance down gradient of the former location of the tank pit and another that penetrated from the upgradient side of the pit into the ground immediately beneath it. The latter boring also passed through the '~ ground beneath the former location of the fuel dispensing island, but no evidence was found that leaking fuel had affected the subsurface in that area. We conclude that there is no evidence that gasoline or any of its components, including any of the BTEX compounds, EDB, MTBE or any other fuel oxygenates have significantly affected soil or groundwater beneath the Alfred Clover Middle School property at 51 East Beverly Place and that the minor traces of hydrocarbons previously detected in a single boring drilled "adjacent to the tank pit"are of less than de minimus significance. 5.0 RECOMMENDATIONS " Based on the results of the subsurface investigation reported herein, we conclude that the environmental condition of soil and groundwater in the area imw around the former site of the 550-gallon underground gasoline storage tank has been adequately investigated. We recommend that no further work be undertaken and that the site be closed according to the procedure described below. 6.0 REQUEST FOR SITE CLOSURE Given the absence of any evidence that the underground storage tank formerly located beneath the subject property has significantly affected soil or groundwater, it is herby requested that the San Joaquin County Public Health Services — Environmental Health Division apply to the California Regional Water Quality Control Board — Central Valley Region for closure of the property at the Alfred Clover Middle School, 51 East Beverly Place, Tracy, sic