COMPLIANCE INFO_1990-2010 - Laserfiche WebLink

Home Browse Search

TANK CLOSURE REPORT 2320 EL Dorado, Stockton, CA Aegis Project No. 89-049 Page 7 [9IWMIU"t.Wq A total of three underground storage tanks and existing product lines were removed under the direction of the San Joaquin County's Environmental Health Division. Prior to removal of the existing underground storage tanks, backfill material above and surrounding the upper portion of the product tanks was removed. Excavated soil was screened for the presence of organic vapors and separated on that basis. The material was stockpiled in two separate piles. The piles were located in the northwest corner of the property and immediately east of the excavated tank location. Soil samples were obtained during excavation according to the Regional Board Guidelines and Environmental Health Division's requirements. Analytical results from soil samples obtained at the bottom of the old tank pit (Figure 3) indicated that over -excavation had removed soil containing petroleum hydrocarbons detected during initial tank excavation. mobile laboratory analytical results of soil samples taken from the sidewalls of the proposed new tank location indicate that petroleum hydrocarbons detected in samples obtained from soil borings advanced during the pre -tank site assessment have been removed with the excavated soil. Verbal permission was obtained from the San Joaquin County Environmental Health Department to back -fill the old tank pit with soil excavated from the proposed new tank location. The tank pit samples were submitted to a state -certified mobile laboratory for analysis of low/medium bong point total petroleum hydrocarbons (TPH as gasoline) with BTEX distinction, total lead, •: Ethylene Dibromide. Soil sample laboratory analytical reports are presented in Appendix A. Laboratory results are summarized in Table 2. Laboratory analytical results for lead were below 10.0 ppm for all samples.