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�. <br /> K• <br /> PMOLEM ASSESSMENT FET'= <br /> INCLULANG WARNEiLY MONNNi rIN0 RUORC <br /> [t 1399 East Yo7emf a Avenue.Mantes,Caldornm <br /> s On April 23, 1991, water samples were collected from the three on site <br /> monitoring wells and submitted to a state-certified laboratory for analysis of <br /> BTEX, EDS, EDC, and TPH, as gasoline. Water levels in all three on site wells <br /> j� were measured and recorded. <br /> On May 28, 1991, water levels in the three on site wells were measured and <br /> recorded. <br /> 1! F <br /> • On June 20, 1991,monitoring wells MW-1 B, MW-4, and MW-5 were installed on <br /> j the site. Monitoring wells MW-4 and MW-5 were drilled as soil borings and <br /> completed as 4-inch-diameter wells to a depth of 35 feet below grade. MW-16 <br /> was constructed as a 6-inch-diameter well by over-coring former well MW-1R. <br /> The-wefts were developed using a wire line operated surge block and 5-foot <br /> stainless steel bailer. <br /> Soil samples were obtained from borings MW 4 and MW-5 at 5-foot intervals. <br /> • Soil samples were classified according to the Unified Soil Classification System <br /> (USCS) and a log of each soil boring was generated. <br /> Soil samples recovered from the borings were screened for the presence of <br /> volatile organic compounds with a hNu photoionizatien detector (PID) and the <br /> ' highest PID reading from each sample was recorded on the soil boring logs. <br /> Drill cuttings were placed on and covered by plastic sheeting. <br /> Based on the results of classitication and PID screening, samples from each <br /> boring were placed under a chain-of-custody, secured in a sealed ice chest <br /> using appropriate preservation methods and submitted to a state-certified <br /> laboratory for analysis. <br /> Soil samples submitted for analysis were tested for BTEX, EDB, EDC, and TAH, <br /> as gasoline. <br /> ! <br /> • The wells were developed by purging approximately three well volumes by use <br /> of dedicated disposable bailers. Data on water levels and water quality from <br /> E each well was recorded. Purged water was contained in DOT-approved 55- <br /> r1 <br /> gallon drums. <br /> • On June 26, 1991, a water sample was collected from MW-5 for analysis of total <br /> fecal and coliform, as required by the San Joaquin County Public Health <br /> { Services, Division of Environmental Health. <br /> I <br />