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• ATC Associates Inc. <br /> 1117 Lone Palm Avenue,Suite 201 <br /> Modesto,California 95351 <br /> 209-579-2221 <br /> fax:209-579-2225 <br /> November 1, 2007 RECEND <br /> 54.25291.0001 NOV 0 7 2007 <br /> ENVIRONMENT HEALTH <br /> Ms. Lori Duncan PERMIT/SERVICES <br /> San Joaquin County <br /> Environmental Health Department <br /> 600 East Main Street <br /> Stockton, CA 95202 <br /> Subject: Addendum for Additional Subsurface Investigation at Former Greer Property, <br /> 15634 Steinegul Road,Escalon, California, Site Code: 2021 <br /> Dear Ms. Duncan: <br /> ATC Associates Inc. (ATC) has prepared this addendum on behalf of Mr. Raymond Greer for the <br /> above listed site. This addendum follows ATC's workplan entitled "Work Plan for Additional <br /> Subsurface Investigation" dated 12 July 2007. It addresses comments in a response from the San <br /> Joaquin County Environmental Health Department (SJCEHD) dated 20 August 2007 regarding <br /> ATC's workplan and incorporates modifications to the original workplan and SJCEHD's letter as <br /> agreed in a discussion between ATC and SJCEHD on 26 October 2007. <br /> The scope of work includes advancing five CPT borings, installing six groundwater-monitoring <br /> wells and coring selected intervals in the deepest (i.e., one well) of the six groundwater- <br /> monitoring wells; analyzing selected soil and groundwater samples; developing the proposed <br /> groundwater monitoring wells; and preparing an investigation report detailing site activities. <br /> The scope of work is described in more detail in the following paragraphs. <br /> Well Installation and CPT Borings <br /> This task includes mobilization to the site, advancing six soil borings collecting and analyzing <br /> samples, and completing the borings as groundwater monitoring wells. It also includes advancing <br /> five CPT borings at the site as shown on Figure 1. <br /> The rationale for CPT boring and groundwater monitoring well location and selection is on <br /> Table 1. <br /> Two borings on the western edge of the site and three borings on the eastern edge of the site will <br /> be advanced using 8" to 10" hollow stem augers (HSA) to approximately 85 feet below ground <br /> surface (fogs). Soil samples will be taken every five feet in all five borings, though not all of the <br /> samples will be analyzed. A laboratory will analyze approximately three soil samples from each <br /> boring. Soil samples will be analyzed for gasoline range organics (GROs) by Environmental <br /> S:\Environmental\25291Vieports\2007 July.doc I <br />