ARCHIVED REPORTS XR0009214 - Laserfiche WebLink

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Stockton" dated November 12, 1997 A summary of the laboratory results of soil & water samples from the probe holes are shown on TABLE A As a result of that work, the lateral limits of the plume have been fairly well defined in all directions Groundwater samples taken at 60' bgl SP-5A & SP-6 (see PLATE IA,} measured 0 071 mg/L & 0 780 mg/L respectively The two closest morutonng wells are MW-6 & MW-2 The water samples taken in December from those two wells recorded 35 1 mg/L & 23 1 mg/L respectively BTEX was detected at fairly high levels in those two monitoring wells, but were ND in the soil probes CONCLUSIONS: 1 The lateral limits of soil & groundwater contamination appear to be well defined in all directions 2 The configuration of the pume has not changed significantly since the June sampling event This indicates that there is little or no horizontal groundwater movement in the area This is to be expected, since the nearest domestic water well is over 200 feet away, and it is not in a downgradient position 3 Although the vertical limits of contamination have not been fully defined, it appears to be restricted to the center of the property RECOMMENDATIONS: o It is recommended that quarterly monitoring continue in order to better evaluate the changes in levels of contamination m Further work offsite does not appear warranted based upon the results of work done to date Although the vertical limits of contamination have not been fully delineated, we do not believe that placing additional wells on the property is justified + We recommend that proposals for remediating the soil & groundwater contamination be obtaine in order to begin cleanup work at the site W �tED Gip W unter&Associates �g� c ephen Valentine Q LLAM I t,u,rE4 + RW CB Y'rer /--lig NO Cir) 0 CA-�"c 'e 2