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4 <br /> Mr. Martinez Page 3 February 23 , 1989 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> The soil gas investigation analytical results indicate the <br /> area most impacted is the area which contained the fuel <br /> dispensers and the pump house as shown on Figure 2. <br /> It is recommended that the impacted soil be excavated to <br /> approximately 15 feet or to an impervious clay layer, <br /> whichever is reached first. Random soil samples will be <br /> collected during excavation for TPH and BTEX analysis at a <br /> state certified laboratory. The excavated soil will be <br /> contained onsite pending analytical results. <br /> The area will be excavated until no further contamination <br /> exists. However, if contamination is evident At depths <br /> greater than 15 feet, then the possibility of groundwater <br /> contamination exists. To determine whether the groundwater <br /> has been impacted, a 2-inch diameter monitoring well will be <br /> installed in the impacted area. To accomplish the <br /> installation of the well , the excavation will be backfilled, <br /> and the boring drilled with a hollow stem auger. The <br /> monitoring well will be completed in accordance with the <br /> protocol contained in Appendix C. Groundwater samples will <br /> be collected in accordance with the protocol contained in <br /> Appndix D. The samples will be transported under chain-of- <br /> custody to a state certified laboratory for TPH and BTEX <br /> analysis. Upon completion, the well will be developed and <br /> sampled. The water samples will be transported under chain- <br /> of-custody to a state certified laboratory for TPH and BTEX <br /> analysis. If groundwater is contaminated, it will be <br /> C necessay to complete a site assessment in accordance with the <br /> CVRWQCB's Guidelines dated June 2, 1988. <br /> r <br /> L. <br />