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4.3 Additional Investigation At this time it is not known how far to the north the contaminated soil extends and therefore an additional soil boring will be im- placed at the time the monitoring wells are installed to delineate the northernmost boundary of the contamination. The location of is shown as boring number 7ne outlined above 0. the boring is shown in Figure 9 and The sample procedure will be identical to the oto and will be carried out until groundwater is encounter4, . Due it the lack of contaminated soils in adjacent borings 2, is expected that the amount of fluid spilled from the tans was minimal. and that the extent of the degradation of fTsoilamle taken will not extend past sampling point ality cumber l0. p thesent mlaberegardless20 to �oftitsneffect uponhthef . iterval in tisbPhotovaclprobe. to 5.0 POSSIBLE REMEDIAL ACTIONS ion of the lateral extent of the tainted soil, a re- Upon determinated to remove the contamination from the medial plan will be enact on 4 soils. 'tthis pinnthethe soipsoissed excavationlandaction aerationmwithaof the situationThe excavated subse- quent disposal in an appropriate disposal facility. to raged soil will be placed in storage bins and aerated according menu set be furth placed the San Joaquin Local Health District. It is felt that this option is the least labor and capital intensive and will produce a solution in the shortest time period. Details on the r the contamination, methods used in the ex- complete linear extent of cavation of the soils, and estimated quantities of soil tc be re- spec moved will be submitted to your department along with be of the groundwater investigation. 6.0 GROUNDWATER MONITORING PLAN The locations of the three groundwater monitoring wells have been shifted due to the results of the soils investigation. The relative positions will be as ,shown in Figure 9 and should serve to detect the existence of pollutants within the groundwater as well as verify the supposed subsurface flow direction. The installation of the wells will be done in accordance with the plan outlined it, BMI's May 22, 1988 workplan submitted to the San Joaquin Local Health IN District. All relevant permits will be obtained prior to the co- mmencement of work at the site.