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I�'z Y ' � r 0V- 1 F.F PRELIMINARY HYDROCEMOCIC A99E93ME,�1T WOP.i:YL/IN IS99 E,Yosemite Avenue,Manteca,Calilarnlu Delta Prolect No,40-88-480 s Page S e F:a o Properly develop the monitoring wells and collect ground water samples from each well and send ground water samples to the laboratory for analysis. 2.0 PREVIOU Y RK ETS Environmental(ETS) had been retained previously by.ferry Moore,of Moore Petroleum, Inc. to conduct a preliminary site assessment at this location. This site assessment consisted of the drilling of four soil borings, installation of one monitoring well and the collection of soil and water samples from the soil borings and monitoring well. The results of the work performed by ETS is presented in the following sections. 2.1 ,oil Morins Four soil borings were drilled by means of a hollow-stem auger to a maximum depth of 36 feet. Soil samples were taken at five-foot intervals by means of a California modified split-spoon sampler. Figure 2 shows the location of the soil borings and monitoring well. Boring logs for the soil borings are presented in Appendix A. Soil samples collected from the soil borings were analyzed by a California-certified laboratory nor benzene, toluene, ethylbenzene, xylones (BTEX), 1,2-dichloroetbane (EDC), ethylene dibromide (EDB)and total petroleum hydrocarbons(TPH)by EPA Method 524.2/8240. Results of the analyses are summzrized in Table 1. Laboratory reports for soil analyses are presented in Appendix B. As shown in Table 1 TPH Ievels are less than I00 ppm for all soil samples. BTEX constituents are found at low levels in all soil samples,with the highest values found in the 20-foot-depth sample m, taken from MW-1. BTEX results from this sample were 0.05,0.03,0.42,and 1.6 ppm, respectively. 2.2 M1i0nitorina Well Monitoring well (MW-1) was completed within the soil boring located immediately south of the underground storage tanks(USTs). This well was constructed of 2-inch-diameter,Schedule 40 PVC blank casing and 2-inch-diameter, Schedule 40 PVC well screen with 0.020-inch slots. The well