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v11117 Lone Palm Avenue, Suite B <br /> y * Modesto, California 95351 <br /> www.atc-enviro.com <br /> 209.579,2221 <br /> Fax 209,579.2225 <br /> A S S o C I A-T E S I N C <br /> December 7,2000 <br /> 17292.0002 <br /> Mr. Jeff Wong <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E. Weber Street, Third Floor <br /> Stockton, California 95202 <br /> Subject: Workplan Addendum. for Supplemental Subsurface Investigation at Stagg High <br /> School, 1621 Brookside Road, Stockton, California <br /> Dear Mr.Wong: <br /> ATC Associates Inc. has prepared this document to serve as an addendum to ATC's Workplan for <br /> Supplemental Subsurface Investigation at Stagg High School, 1621 Brookside Roam Stockton, <br /> California (Workplan), dated September 12, 2000. The Workplan was prepared by ATC on <br /> behalf of Stockton Unified School District (SUSD) to evaluate the vertical and horizontal extent <br /> of petroleum impacted soil and groundwater in the vicinity of the former underground storage <br /> tank (UST). The Workplan was requested by San Joaquin County Public Health Services, <br /> Environmental Health Division(PHS/EHD) in correspondence dated July 21, 2000. <br /> The original scope of work included obtaining permits, advancing five soil borings using direct <br /> push technology and collecting soil and groundwater samples, laboratory analysis of selected soil <br /> and groundwater samples, and preparing a summary report. <br /> However, during a June 6, 2000 telephone conversation between Mr. Tom Lutterman of ATC <br /> and Mr. Jeff Wong of PHS/EHD, the Workplan was discussed and alternative investigative <br /> methodologies were evaluated. PHS/EHD and ATC both agreed that installing additional <br /> monitoring wells was warranted at the site in lieu of the soil borings proposed in the Workplan. <br /> The monitoring wells will provide repeatable groundwater sampling points perhaps preventing the <br /> i <br /> need for.additional drilling activities. ATC agreed to submit an addendum to the Workplan that <br /> will include the installation of additional monitoring wells at the project site, <br /> r <br /> wA17292.0002,reportslwkp.doc 1 <br />