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-RZ <br /> Working To Restore Nature <br /> • Concentration contours of contaminants remaining in the soil are depicted on Figure 5. <br /> Petroleum hydrocarbon analytes have not been present in the groundwater since July <br /> 1992 Figure b depicts well MW2 analytical results for benzene and TPHg over the <br /> investigative history of the site Total petroleum hydrocarbons as diesel was detected in <br /> well MW 1 only in January 1990 This well was then inadvertently destroyed during <br /> paving activities during the summer of 1990 Benzene and TPHg were not present at or <br /> above method detection limits in well MW-3 during the investigative history of the site, <br /> 0 The mass balance calculations for the previously removed petroleum hydrocarbon <br /> contaminated soil and the residual impacted soil are presented in Table 4, <br /> • Remediation activities were confined to removal of 90 percent of the source material, <br /> • Excavation of the residual soil was not possible due to the location of high voltage lines <br /> and a light pole <br /> Please review this data and RESNA's Summary/Closure Report dated September 8, 1993 and <br /> schedule a closure review meeting If you have further questions or concerns please call (209) <br /> 838-3507 <br /> Respectfully, <br /> RESNA Industries Inc <br /> C�Y�� 3�a <br /> Lois Frantz <br /> Project Geologist <br /> Gregory P Stahl <br /> CA Registered Geologist No 5023 <br /> LF/gk <br /> M 10W01691LETTF-tS1SJCPHS LF <br />