Laserfiche WebLink
TANK CLOSURE REPORT <br /> 2320 EL Dorado, Stockton, CA <br /> Aegis Project No. 89-049 <br /> Page 7 <br /> 3.2 Tank Closure <br /> A total of three underground storage tanks and existing product lines <br /> were removed under the direction of the San Joaquin County's <br /> Environmental Health Division. Prior to removal of the existing <br /> underground storage tanks, backfill material above and surrounding the <br /> upper portion of the product tanks was removed. Excavated soil was <br /> screened for the presence of organic vapors and separated on that <br /> basis. The material was stockpiled in two separate piles. The piles <br /> were located in the northwest corner of the property and immediately <br /> east of the excavated tank location. Soil samples were obtained during <br /> excavation according to the Regional Board Guidelines and <br /> Environmental Health Division's requirements. <br /> Analytical results from soil samples obtained at the bottom of the old <br /> tank pit (Figure 3) indicated that over-excavation had removed soil <br /> containing petroleum hydrocarbons detected during initial tank <br /> excavation. Mobile laboratory analytical results of soil samples taken <br /> from the sidewalls of the proposed new tank location indicate that <br /> petroleum hydrocarbons detected in samples obtained from soil borings <br /> advanced during the pre-tank site assessment have been removed with <br /> the excavated soil . Verbal permission was obtained from the San <br /> Joaquin County Environmental Health Department to back-fill the old <br /> tank pit with soil excavated from the proposed new tank location. <br /> The tank pit samples were submitted to a state-certified mobile <br /> laboratory for analysis of low/medium boiling point total petroleum <br /> hydrocarbons (TPH as gasoline) with BTEX distinction, total lead, and <br /> Ethylene Dibromide. Soil sample laboratory analytical reports are <br /> presented in Appendix A. Laboratory results are summarized in Table <br /> 2 . Laboratory analytical results for lead were below 10. 0 ppm for all <br /> samples. <br /> n ' •nnI'� <br /> 'VIRONMENTAL HEA <br /> 'EfewI f/SERVE"' <br />