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RUSS CHAPIN 249-464-6947 11-17-95 47:47 P.43 <br /> Mr. Russell y• Chapin, Sr. <br /> Novbtnher 15, 1995 <br /> Page 2 <br /> Soil srurnples taken during tR4 removal indicated that significant Cantaminatiotl Was <br /> present tMIOW the tanks. <br /> lour soil borings were drilled Onsite and offsite to the north and west acid Converted into <br /> tine 4-in vapor extraction well find three 2-in groundwater trronitoring wells by SEACUR; <br /> this was followed by drilling$ soil borings,7 of which were located offsite to the west <br /> 1111d west-skiuthwest. Contamination was found to extend offsite to the west-soulbwest up <br /> to 200 fl,although most offsite contamination was at very low levels. <br /> An aquifer test and a vapor extraction test were performed by SF•ACOR; while the data <br /> +vere of poor quality,it was judged that groundwater extraction was not tCasible and that <br /> soil viipor extraction was likely to he feasible. However,it should be noted that the tsst <br /> was of short duration and wits not performed on multiple wells. <br /> ccologicai Audit Services chilled five soil borings and Constructed one dually t•.Onrpleted <br /> 4-in vapor extraction well / 2-in air sparging observation well,one 2-in air sparging <br /> AR well, one dually completed 2-in vapor extraction wc11/2-in air Sparging well, <br /> otic 4-hi vapor extraction well,and one air sparging well, and performed ail air <br /> spatyjng/vapor extraction feasibility test, During the test,vacuums of 22 to 40 ins 1120 <br /> resulted in observed vacuums up to 90 fl away from tilt extraction well; an estinrate.d <br /> rtrdius of influence of 37 A wm presented. <br /> St'UP�: ()F WORK <br /> l,t Scope of Work includes the following tasks delineated in the )~irral Remedial Plan for i <br /> the site: <br /> Construction of one additional groundwater monitoring well. <br /> • Installing trenching to insiall piping ,installing a Vapor lrxtraction 1117 Situ Air""Parging <br /> System. <br /> Procuring an intemal combustion engine/blower tot the remediation system. <br /> • Monitoring the system daily for the first two weeks,weekly for one yet+r,and monthly <br /> collection.and analysis o0dr samples. <br /> progress sail sampling at(-month intervals. <br />