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PROBLEM ASSESSMENT REPORT <br /> 14800 West Frontage Road Manteca California <br /> 2.2 Previous _estigations <br /> Aegis was contracted to complete the site investigation in January 1991 Work performed <br /> at the site by previous consultants included investigations by ETS, Delta, Triad, and <br /> Nations Approximate locations of the resulting monitoring wells are shown on Figure 2 <br /> The results of laboratory analysis of soil and groundwater samples from these <br /> investigations are summarized in Tables 2 through 4 <br /> The following is a brief summary of the investigations completed to date <br /> • In August 1988, ETS drilled two sod borings and completed them as 2-inch- <br /> diameter groundwater monitoring wells MW-1 and MW-2 ("Environmental <br /> I Preliminary Site Assessment," dated August 1988) A total of twelve soil <br /> samples, collected from the soil borings, and groundwater samples from the <br /> two wells were submitted for analysis Results of soil analysis are <br /> summarized in Table 2 Results of groundwater analysis are summarized <br /> in Table 3 <br /> In April and May 1989, Delta supervised drilling of two additional soil <br /> borings The borings were completed as 2-inch-diameter monitoring wells <br /> MW-3 and MW-4 ("Preliminary Hydrogeologic Assessment Report," dated <br /> September 8, 1989) Five sod samples, collected from the soil borings, and <br /> groundwater samples from the four wells were submitted for analysis <br /> Results of soil analysis are summarized to Table 2 Results of groundwater <br /> analysis are summarized in Table 3 <br />' In November 1989, Delta supervised the removal of three 10,000-gallon UST <br /> and associated product piping (Table 1) Approximately 800 cubic yards of <br /> sod were excavated and stockpiled on site during the excavation During <br />' the tank removal, ten sod samples were collected and submitted for analysis <br /> (Table 4) Slotted 4-inch-diameter PVC was installed within the former UST <br /> excavation and beneath the former product line trenches as components for <br />' a soil vapor extraction system Figure 3 The slotted PVC is manifolded to <br /> blank PVC which "day-lights" at the north end of the site ("Problem <br /> Assessment Report," dated September 14, 1990) Two 10,000-gallon and <br />' one 8,000-gallon double-wall fiberglass UST and associated product piping <br /> were set approximately in the same location as the former UST and product <br /> Piping <br /> I <br />' 90-097A PAR 3 <br />