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1590 Solano Way <br /> Concord, CA 94520 <br /> 200,E <br /> t=nt� <br /> December 17, 2007 TRC Project No. 151793 <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> boo East Main Street <br /> Stockton, California 95202 <br /> RE: Additional Soil and Groundwater Investigation Work Plan - <br /> Addendum <br /> Central California Traction Company(CCT)Stockton Rail Yard <br /> 1645 Cherokee Road <br /> Stockton, California <br /> Dear Ms. Duncan: <br /> On behalf of Central California Traction Company(CCT),TRC submits this Additional <br /> Soil and Groundwater Investigation Work Plan Addendum in response to comments <br /> from the San Joaquin County Environmental Health Department(SJCEHD) in a letter <br /> dated November 26, 2007 concerning the Additional Soil and Groundwater <br /> Investigation Work Plan submitted by TRC on October 4, 2007. <br /> The responses to the SJCEHD comments are provided herein to clarify CCT's position <br /> regarding proposed investigation activities at the site and are included below in a point- <br /> by-point format. <br /> LOCATION OF WWCSF-78 <br /> SJCEHD Comment Paragraph 3: <br /> TRC indicated...sample WWCSF-78 was collected from the north wall...the CLS Report, <br /> describes the location of WWCSF-78 as `West wall floor'. TRC did not provide an <br /> explanation of how they determined that this sample was actually collected from the <br /> north wall of the excavation and notfrom the west wall. <br /> TRC Response: <br /> TRC determined the presumed location of sample WWCSF-78 based on Sheet 1o, <br /> Excavation Plot w/Confirmation Sample Locations of the CLS Report which shows the <br /> location of sample WWCSF-78 near the north wall of the excavation. However, as the <br /> SJCEHD has indicated, Table 2, Remedial Progress Sampling Results, submitted in the <br /> CLS Report, describes the location of WWCSF-78 as`West wall-floor'. <br />