ARCHIVED REPORTS XR0009902 - Laserfiche WebLink

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Quarterly Report - 152 East 1 lth Street, Tracy Page 3 beneath the site had not previously been suspected Permits to remove the tank were obtained from the City of Tracy and the SJCPHS on February 14 On February 15, under the oversight of a representative of the SJCPHS the tank was inerted, removed and shipped for cleaning and destruction at a permitted facility Samples recovered from the bottom of the tank pit, also in the presence of the SJCPHS's representative, were shipped for testing at a laboratory licensed by the California Environmental Protection Agency, Department of Health Serviceto perform the requisite analyses They contained no detectable concentrations of any analytes of concern Excavation of contaminated soil beneath the 125 East 11th Street property was completed on March 18, 1996 Observations made in the walls of the remedial excavation as it was extended vertically and horizontally, and the results of analyses of samples recovered from the walls and poor of the excavation, strongly indicated that the source of the contamination had not been located beneath the subject property but at a close-by location to the north and under the public street This conclusion was confirmed when four pipes of the type used to pump from and vent underground gasoline storage tanks were found Based on their location and their length when they were pulled out of the ground, it was clear that these pipes lead to two underground fuel storage tank located at a point under the street some 10 ft beyond the site boundary The geometric configuration of the pipes and their fittings . suggested that the leaking tanks are still present on City of Tracy property and this conclusion is supported by the lateral and vertical distribution of components of gasoline that was revealed in the remedial excavation The extent of the remedial excavation and the locations of underground storage tanks that were formerly located on the subject site and are, or were, situated on surrounding property are shown on Figure 2 A water supply line and two sewer lines servicing the site, which were exposed in the walls of the remedial excavation, were cut off and sealed according to the requirements of the City of Tracy In compliance with the CAP, the excavated soil affected by hydrocarbons that was excavated from beneath the site was transported to a pre-designated treatment site where it will be treated by aeration before being recycled in beneficial use as an agricultural soil amendment On March 19, 1996 the soil stockpile was quartered and five samples recovered from it to determine the mean concentration of hydrocarbons is contained Analyses showed that the representative samples contained less than 2 5 mg/Kg of total petroleum hydrocarbons This result was communicated to the staff of the San Joaquin Valley Unified Air Pollution Control District (SJVUAPCD) who concluded that the mean concentration of hydrocarbons affecting the soil was not of regulatory concern to the SJVUAPCD and that its treatment could proceed without permit from that agency