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<br /> URS
<br /> Mr.Ross Atkinson
<br /> May 15,2007
<br /> Page 2
<br /> In September 2006,a passive soil vapor extraction trench was installed at the site to control methane
<br /> from leaving the site. During the activities to install the passive soil vapor extraction trench,the
<br /> majority of the debris observed within the soil was wood debris. Other debris observed included the
<br /> following: concrete,miscellaneous metal debris such as rebar,plastic piping, plastic sheeting,tires,
<br /> and one 100-gallon steel tank.None of the materials typical of municipal solid wastes during the
<br /> 1970s and 1980s,such as paper and paperboard products(e.g.,newspaper,books,magazines,
<br /> corrugated boxes,and bags and sacks); glass products(e.g., glass containers such beer and soft drink
<br /> bottles,wine or liquor bottles, and food bottles and jars); metal products(e.g.,appliances,furniture,
<br /> batteries,containers such as beer or soft drink cans,and food cans);plastic products(e.g.,soft drink
<br /> bottles,milk or water bottles, container,clothing,diapers, and footwear); food wastes; or yard
<br /> trimmings were observed within the excavated materials during our activities.
<br /> In December 2005,a vapor extraction pilot test was conducted to evaluate the feasibility of installing
<br /> a permanent landfill gas extraction system. During this test,vapor samples were collected from the
<br /> two extraction wells and analyzed for volatile organic compounds(VOCs).Analytical results for
<br /> these samples showed that VOCs were present,and the total VOC concentration in each vapor
<br /> extraction well was less than 5 ppmV. Based on these results,there was a potential for VOC
<br /> constituents to be present in groundwater.
<br /> In June 2006,URS installed three groundwater monitoring wells at the World Enterprises site
<br /> (Figure 1)and began quarterly groundwater monitoring activities. Since June 2006,groundwater
<br /> samples have been collected and analyzed for VOCs and since December 2006, groundwater
<br /> samples have also been collected and analyzed for general minerals and metals.
<br /> A letter dated February 20,2007 from the Regional Water Quality Control Board(RWQCB)
<br /> identified the following eight constituents to be significant: aluminum, arsenic,barium, iron, lead,
<br /> manganese,nickel, and total dissolved solids,based on their review of the December 2006 quarterly
<br /> monitoring report. This letter requested Tandy Corporation to provide the following items:
<br /> • Submit a work plan to investigate the horizontal and vertical extent of groundwater impacts with
<br /> a time schedule by May 15,2007;
<br /> • Submit a Site Groundwater Investigation Report by November 30,2007; and
<br /> • Submit a groundwater monitoring plan with a time schedule by May 15,2007.
<br /> Following the receipt of the February 20,2007 letter,Mr.Jay Kamine of URS contacted Mr. Ross
<br /> Atkinson of the RWQCB and later met with Mr.Atkinson on April 16, 2007. The meeting was an
<br /> opportunity to provide Mr.Atkinson with additional site information,to learn what cleanup
<br /> requirements the RWQCB would likely impose at this site for the constituents identified in the
<br /> February 20,2007 letter, and to discuss the RWQCB's objectives for their letter.
<br /> RESPONSES TO RWQCB REQUIREMENTS
<br /> The following three subsections provide responses to the RWQCB's three requirements identified in
<br /> your February 20,2007 letter.
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