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3 <br /> CJ.eo6gicaf*chnics inc. Page 2 <br /> Former Moresco Property <br /> Site Characterization Report <br /> Project No.2512 <br /> #6. October 11, 1996 <br /> (bgs). This information was reported to the San Joaquin County Public Health Services <br /> Environmental Health Division (SJCPHSEHD) in the Geological Technics Inc. Tank <br /> Removal Report, 16865 Gawne Road, dated December 9, 1994. <br /> A subsurface investigation designed to define the vertical and lateral extent of the impacted <br /> area was proposed in the Geological Technics Inc. Site Characterization Work Plan dated <br /> March 14, 1995. The Work Plan was approved by the SJCPHSEHD on April 3, 1995. <br /> V <br /> An initial subsurface investigation was conducted April 5 to 7, 1995 and a remobilization <br /> occurred on April 21, 1995. The results of this investigation indicated that the vertical extent <br /> at or near the point of release was defined. The lateral extent remained undefined to the north <br /> and east. This information was documented in the Geological Technics Inc. Soil Boring <br /> Installation Report dated May 12, 1996. <br /> &W In response to the investigation's findings, SJCPHSEHD directed that further site <br /> characterization work be performed in their March 27, 1996 correspondence. It was directed <br /> that additional geotechnical, geochemical, and soil gas data be collected from a boring <br /> through native soil near the point of release. This additional information could be used to <br /> evaluate the fate and transport of the contamination and help determine if it would adversely <br /> affect human health or the environment. <br /> This report documents the site characterization work performed to date and makes <br /> recommendations for modeling the fate and transport of these chemicals and for evaluating <br /> the risk of leaving these chemicals in the ground for natural attenuation processes to address. <br /> 1.1 Project Chronology <br /> W 11/15/94 500 gallon UST removed <br /> 03/14/95 Submit Site Characterization Work Plan <br /> 04/5-7195 Drill SB-1, SB-2, S13-3, & S13-4 <br /> 04/19/95 Submit addendum proposing SB-1A <br /> 04/21/95 Drill SB-IA <br /> 05/12/95 Submit Soil Boring Installation Report <br /> 09/06/95 SJCPHSEHD request Additional Site Characterization Work Plan <br /> ,.. 10/13/95 Submit Additional Site Characterization Work Plan proposing (1) MW <br /> 10/19/95 SJCPHSEHD approve Additional Site Characterization Work Plan <br /> 12/20/95 Submit Addendum proposing VEW's to the 10/13/95 Work Plan <br /> 12/29/95 SJCPHSEHD request additional assessment <br /> `^ 02/09/96 Submit Addendum 42 proposing additional borings and <br /> geotechnical testing to the 10/13/95 work plan <br /> 03/01/96 SJCPHSEHD approve 10/13/95 Work Plan w/modification <br /> 03/27/96 SJCPHSEHD request amendment to the 10/13/95 work plan <br /> 04/08/96 Submit Addendum 93 modifying geotechnical testing parameters <br /> to the 10/13/95 Work Plan <br /> 04/25/96 SJCPHSEHD approve 04/08/96 Addendum <br /> 06117-18196 Drill SB-5, SB-6, SB-7 <br /> 07/22/96 Submit addendum for geotechnical testing for archived sample <br /> 07/29/96 SJCPHSEHD approve testing archived sample <br /> `"� 10/11/96 Submit Site Characterization Report <br />