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Working To Restore Nature <br /> subsequent to their removal Sample locations are shown on Figure 2 Laboratory analytical <br /> data are summarized in Table 1 Based on the results of this initial investigation, further <br /> remedial action was not required at that time However, due to a subsequent change in <br /> regulatory requirements for lead, soil beneath two of the tanks potentially exceeded,acceptable <br /> levels and further investigation was required by the San Joaquin County Public Health Services, <br /> Environmental Health Division (PHS/EHD) <br /> In December 1989, WaterWork Corp (now RESNA) drilled five soil bonngs peripheral to the <br /> i <br /> rlimits of the former tank pit Locations of soil bonngs are shown on Figure 2 Soil samples <br /> were collected from depths of between approximately 10 and 43 feet below grade Analytical <br /> ' results (Table 1) indicated that only soil from bonngs nearest the former tank pit (SBI and S112) <br /> contained detectable petroleum hydrocarbons Organic lead was nondetectable in all of the <br /> ' bonngs Investigation of potential groundwater contamination by petroleum hydrocarbons was <br /> required by the PHS/EHD <br /> In April and May 1991, RESNA supervised the installation of three groundwater monitoring <br /> wells on the property Monitoring well locations are shown on Figure 2 One soil sample was <br /> collected from each boring at the soil/water interface and submitted for analysis of benzene, <br /> toluene, ethylbenzene and xylenes (BTEX), total petroleum hydrocarbons as gasoline (TPHG), <br /> and TPH as diesel (TPHD) Results of laboratory analyses are presented in Table 1 No <br /> petroleum hydrocarbon constituents were detected with the exception of toluene Toluene was <br /> detected at very low levels in the soil samples collected from each well <br /> 1 <br /> Groundwater elevation measurements were made on May 7, 1991 The depth to groundwater <br /> ' was approximately 61 feet below grade The groundwater gradient averaged 0 03 feet/foot in <br /> a north-northwesterly direction Groundwater monitoring data are presented in Table 2 <br /> 1 <br /> {Prod PisklReponslSAR1093 FNL} 2 <br />