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FROM UHOCRL CERT-NORTH • �?= C,'7 P. 3 <br /> to collect groundwater samples from each of the wells during Condor's <br /> initial groundwater sampling. <br /> The attached figure shows the well locations proposed by Condor and <br /> the new locations proposed by E & E. E & E has labeled the well <br /> locations for purposes of discussion. Contamination was discovered <br /> beneath the tank farm around the former oil-water separator and connected <br /> dry wells. Monitoring Well 1 (HW1) has been moved closer to the tank <br /> farm in the area of the underground pipeline connecting the shop to the <br /> former oil-water separator in order to collect samples near known <br /> contamination. Monitoring Well 2 (MW2) has been moved to the approximate <br /> center of the former wastewater collection pond; the location proposed by <br /> Condor appears to be just outside the area of the former pond. <br /> Monitoring Well 3 (HW3) has been moved to the southwestern corner of the <br /> facility; sampling done in this area by PureCro before the site was <br /> combined with Brea indicated possible contamination. Moving MW3 here <br /> will expand the area covered by the three wells, incorporating more of <br /> the facility into the soil and groundwater investigation without <br /> affecting Condor's ability to determine local groundwater gradients. An <br /> alternative would be to install four wells instead of three. <br /> E & E also proposes replacing the second 6-inch liner with two 3-inch <br /> liners. These liners would be given to EPA for analysis. Although <br /> debris (sluff) falling into the the first or uppermost liner make it <br /> unacceptable for analysis, it may be sufficient for logging purposes. An <br /> alternative approach would be to use a longer split-spoon sampler fitted <br /> with four or more brass liners; the first liner could be discarded and <br /> the remaining liners could be used for logging or analysis. <br /> Modifying the Work Plan as described, will allow EPA to conduct the <br /> sampling and analysis required to meet its objectives and still meet the <br /> soil and groundwater investigation goals of the existing Work Plan. <br /> pc/brea2/memo <br />