ARCHIVED REPORTS XR0006258 - Laserfiche WebLink

Home Browse Search

Additional Site Assessment Report and Request for Closure I 7-Eleven Inc.Store#17647, 1048 W Yosemite Avenue,Manteca,CA August 13, 1999 r� 1 0 INTRODUCTION ' This report is submitted by IT Corporation, Inc to summarize the results of site assessment conducted at 7-Eleven Store No 17647, 1048 West Yosemite Avenue, Manteca, California (Figures 1 and 2) The scope of work Included drilling five direct-push soil borings, collection of soil and (grab) ' groundwater samples, and preparation of this report summarizing the methods and results of the work performed The work was designed to fulfill the requirements of the San Joaquin County Public Health Services Environmental Health Division (SJCEHD) as requested on March 18, 1999(Work Plan For Subsurface Investigation, IT Corporation, March 25, 1999) The work scope described in this report was completed at the site on June 18, 1999 All work was ' performed in accordance with the work plan,which was approved by the SJCEHD prior to field activities 2.0 BACKGROUND On December 4 , 1998, two 10,000-gallon single-wall steel underground storage tanks (USTs)and one 6,000-gallon single-wall steel UST were removed from the site One soil sample was collected from beneath each end of each UST(for a total of six)from the base of the tank pit excavation at depths of 14 feet below grade Two tank pit sldewall samples were also collected from depths of 6 feet below grade All soil sampling was conducted at the direction of Mr Harlin Knoll of the SJCEHD (IT ' Corporation, January, 1999) All soil samples collected during UST removal were analyzed for benzene, toluene, ethylbenzene, total ' xylenes(BTEX), methyl-tertiary butyl ether(MTBE), and total petroleum hydrocarbons as gasoline (TPH-G) by EPA Methods 8020/8015 modified, and for MTBE and other oxygenates by EPA Method 8260 Total lead was analyzed for using EPA method 6010 Soil benzene was not detected, TPH-G concentrations ranged up to 1,300 milligrams per kilogram (mg/kg)at the base of excavation (the sidewall samples were non-detectable) Soil MTBE levels were less than 0 02 mg/kg, and soil lead levels were up to 6 1 mg/kg The SJCEHD requested further assessment upon receipt of tank pull ' findings 30 SOIL AND GROUNDWATER ASSESSMENT ' ' 31 Site-Specific Health and Safety Plan I�I I, The site-specific Health and Safety Plan was revised to include recent field activities as required by the ' Occupational Safety and Health Administration Standard Hazardous Waste Operations and Emergency Response guidelines (29 Code of Federal Regulations 1910 120) The document was reviewed and I ' signed by'all IT Corporation personnel and subcontractors prior to commencement of work at the site 1 ` I I II iii f f Eli rl' t rl I I I