ARCHIVED REPORTS_XR0003224 - Laserfiche WebLink

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C\),VV, IY*i'Illli IIIII ISI I A S S 0 C I A T E S I N C On June 30 and July 1, 1997, Smith Technology personnel supervised advancement of seven soil ' borings, SBI through SB7, at the site to depths ranging from approximately 40 to 45 feet bgs at the site to investigate the horizontal and vertical extent of petroleum hydrocarbon impacted soil and groundwater Three of the soil borings were completed as groundwater monitoring wells ' and two of the soil borings were completed as vapor extraction wells The analytical results of soil and groundwater samples indicated the site was impacted with petroleum hydrocarbons Field activities and analytical results were detailed in Smith Technology's Summary Report, 1 dated September 17, 1997 ' Smith Technology, whose assets were purchased by ATC Associates Inc on August 20, 1997, prepared a workplan for the additional soil and groundwater investigation and submitted the workplan and permits to PHS/EHD for review and approval on December 2, 1997 PHS/EHD ' approved the ATC workplan, with minor modifications, in correspondence dated March 9, 1998 ' On March 24 and 25, 1998, ATC personnel supervised the advancement of seven soil borings at the site Drilling was performed by V&W Drilling using hollow stem auger and direct push technology In accordance with the approved workplan, four of the soil borings were completed as groundwater monitoring wells MW4, MW5, MW6, and MW7 One soil boring was advanced to approximately 68 feet to determine the vertical extent of contamination and one soil boring ' was advanced at an angle adjacent to the on-site building The results of the site investigation were detailed in ATC's Summary Report Subsurface ' Investigation, at 610 North Hunter Street, Stockton, California, dated August 14, 1998 The report stated that the vertical extent of the soil contamination was defined in the area of the excavation and that horizontal contamination was defined to the west, northwest, and southwest In addition, ATC conducted a well survey of any groundwater wells located within 2,000 feet of the site The results of the well survey were included in ATC's report ' ATC was retained by Mr and Mrs Raymond Farmer to perform an additional Y p subsurface ' investigation at the site This work was performed at the request of San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) 2.0 METHOD AND PROCEDURES All work described herein was performed in accordance with ATC's Workplan to Complete ' Groundwater and Soil Investigation, dated December 30, 1998, which was approved with minor modifications by PHS/EHD in correspondence dated January 27, 1999 w 1625961reponslphni doc 2