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i <br /> PROBLEM ASSESSMENT REPOFTT <br /> 14800 West Frontage Road Manteca California <br /> • In December 1989, Delta supervised drilling of four additional soil borings <br /> The borings were completed as 2-inch-diameter monitoring wells MW-5, <br /> MW-6, MW-7, and MW-8 ("Problem Assessment Report," dated <br /> September 14, 1990) Well MW-5 was installed off site (Figure 2) A total <br /> of four soil samples, collected from the soil borings, and groundwater <br /> samples from the eight wells were submitted for analysis Results of the soil <br /> analysis are summarized in Table 2 Results of the groundwater analysis <br /> are summarized to Table 3 <br /> • On July 6 and August 23, 1990, Triad collected depth-to-groundwater <br /> measurements and analyzed groundwater samples from the eight <br /> monitoring wells ("Problem Assessment Report," dated <br /> September 14, 1990) Depth-to-groundwater measurements are <br /> summarized in Table 5 Results of the groundwater analysis are <br /> summarized in Table 3 <br /> I On January 31, 1991, Aegis collected and submitted for analysis <br /> • rY 9 Y <br /> groundwater samples from the eight monitoring wells ("Quarterly <br /> Groundwater Monitoring Report," dated April 18, 1991) A total of thirty-two <br /> discrete soil samples were collected from the soil stockpile located on site <br /> Results of the groundwater analysis are summarized in Table 3 Analytical <br /> results for the stockpile soil samples are summarized in Table 4 <br /> I On July 22, 1991, Aegis collected and submitted for analysis groundwater <br /> samples from the eight wells ("Quarterly Groundwater Monitoring Report," <br /> dated October 11, 1991) Results of groundwater analysis are summarized <br /> Iin Table 3 <br /> • In August 1991, with approval from the San Joaquin County Environmental <br /> I Health Department, Aegis used the existing stockpile for landscaping on <br /> site <br /> I On October 21, 1991, Aegis collected and submitted for analysis <br /> groundwater samples from the eight wells ("Quarterly Groundwater <br /> Monitoring Report," dated February 20, 1992) Results of the groundwater <br /> analysis are summarized in Table 3 <br /> • On November 15, 1991, Aegis supervised drilling of one additional soil <br /> boring on site The boring was completed as 4-inch-diameter monitoring <br /> well MW-9 A total of two soil samples were collected from the soil boring <br /> and submitted for analysis ("Quarterly Groundwater Monitoring Report," <br /> Idated February 20, 1992) Results of soil analysis are summarized in <br /> . Table 2 <br /> I90-097A PAR 4 <br />