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ATC Associates Inc. <br /> CvvATC _ 17 Lone Palm Avenue, Suite B <br /> Modesto, California 95351 <br /> 209-579-2221 <br /> ASSOCIATES I N C. fax: 209-579-2225 <br /> February 11, 2005 <br /> 54.33778.0004 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Street, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Subsurface Investigation at 17327 South Van Allen Road, Escalon, <br /> California <br /> Dear Ms. Lagorio: <br /> ATC Associates Inc. has prepared this workplan, on behalf of The Lyle Company and AT&T <br /> Wireless (AWS), for the performance of subsurface investigation activities at the above <br /> referenced site. The purpose of the subsurface investigation is to evaluate the extent of petroleum <br /> impacted soil at the site, if any, as part of due diligence and worker safety investigations prior to <br /> the erection of a telecommunications tower and equipment compound. The potential for <br /> petroleum hydrocarbon impacted soil arises from two former"farm" USTs located in the vicinity <br /> of the planned telecommunications compound. <br /> The scope of work includes advancing up to three GeoprobeO soil borings; analysis of selected <br /> soil samples; and preparing an investigation report detailing site activities. The scope of work is <br /> described in detail in the following paragraphs. <br /> SITE LOCATION <br /> The site is located on the west side of South Van Allen Road as shown on Figure 1. The location <br /> is a residential and agricultural area. The site is currently occupied by an almond orchard and a <br /> residence with related storage buildings. <br /> BACKGROUND <br /> In the late 1980's, two small"farm" underground fuel storage tanks (USTs) of unknown capacity <br /> were removed from the site. No soil sampling or analysis was performed at the time of the tanks' <br /> removal, and their disposal is not documented. <br /> AT&T Wireless is proposing to construct a telecommunications tower and compound <br /> approximately 40 feet north of the location of the former USTs, with utility trenching that will <br /> come as close as 20 feet to the north of the former USTs. <br /> wAwordpro\33778\0004\wkp.doc I <br />