ARCHIVED REPORTS XR0001344 - Laserfiche WebLink

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f taken from either of the soil borings A monitoring well(MW 1)was constructed in the area of Tank 43 with a twenty-foot screen setting at a bottom depth of 50 feet After well development and purging, water samples were extracted and analyzed for BTEX,TPHg and MTBE Free product was found in MW 1,and the water sample was contaminated with gasoline On 6/15198,a report of the findings was issued on Phase 1 of this site investigation and further site investigation work was recommended In answer to the Phase 1 report,Mr Michael Infurna of the PHS-EHD requested that a Work Plan be formulated to assess the extent of the contamination plume Mr Huckins ordered that pre-approval be obtained from the UST Clean-up Fund and the Work Plan be constructed A well permit was obtain from the PHS-EHD on 219/99,and the owner was notified construction would begin on 3/08/99 On 3/08199 work was started on the bore hole for MW2A to a depth of 120 feet The monitoring well was completed on 3/9/99 The bore hole for MW3A was started on 3/10/99 to a depth of 105 feet and the monitoring well was completed on 3/11/1999 MW213 and MW313 were installed on 3/12/99 INTERIM REPORT OF FINDINGS Soil Boring Procedure Only the bore holes for MW2A and MW3A were sampled and logged Soil samples were extracted at five foot intervals on both bonngs An eight inch hollow stem auger with a two-inch split spoon sampler was used for all soil samples The depth of each soil boring was determined by visual and odor reference Each boring was completed to the depth determined to be the vertical extent of the contamination plume The soil borings for MW213 and MW313 were made to existing ground water plus ten feet These bore holes were not sampled, as they were less than ten feet from the respective soil boring of MW2A and MW3A which were sampled to a greater depth Soil Sample Analysis Results Soil samples from the soil boring of MW2A indicate that the contamination plume begins at twenty feet below the surface and continues to a depth of 120 feet MW3A produced contaminated samples from a depth of thirty feet to a depth of 105 feet below the surface The most concentrated contamination lies between thirty and sixty feet below the surface with both bore holes (see attached summary of soil sample results from all 44 soil samples) Monitoring Well Construction and Sampling The four monitoring wells were constructed in their respective soil borings as discussed above(see attached sketch for the construction of the monitoring wells) Del-Tech Geotechnical developed . each well to the standards of the industry The monitoring wells were all sampled on 04/02/99 All wells produced samples that were contaminated by BTEX and TPHgas All samples were 2