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Ors Shpt b r , Y 9gQ,f sampplea tram monitor wells MW3, MW4A, and MWC <br /> �1 g �;obta#ris�!' !or" enaiyei� �i! decal colifa**. Monitor wails M03 <br /> afiC" M44f ar®=below detection limits°ot 4"MPY/100mi, f0hile monitor <br /> well MW6 tester at 11 MPN/100m1, this analysis was not run during <br /> this- most recent sample analysis. <br /> SOIL REMEDIATION <br /> Ae est t e liesr ,the ,task excavation wAs rextended to,the 25 foot <br /> t� Mamply®awrataki�nrfet`=kthat tai®,; Jui� _ 2b; 1990: Jill the <br /> ales �r e""nori 'dei`eCt", }Tless than 10 ppm, for Total Petroleum <br /> Hydrocarbons (TPH) . Minor amounts of toluene, ethylbenzene, and <br /> xylenes showed up in the sample taken from the center of the <br /> excavation EX-5 and minor amounts of xylenes showed up in the <br /> samples taken at the southeastern edge of the excavation EX-A and <br /> EX-B. The vapor extraction well EX was drilled and sampled on <br /> October 9, 1990, and showed 2 ppm gasoline range hydrocarbons at <br /> the 30 and 37 foot depth with the BTEX's being below detection <br /> limits for these samples. The soil analysis from the placement of <br /> the two additional monitor wells (MW5 and MW6) were all below <br /> detection limits for TPH and BTEX with the exception of the sample <br /> ` obtained from MW5 at the true vertical depth of 33 feet, which had <br /> ` minor amounts of toluene and xylenes, see Table 1 and Appendix B. <br /> r �,-� t $ ,ate"� �.,...� �� ' 44e���►►�� ����'ori�71�t�1'6;f`4�� <br /> were 1�90.y aria acfio�anco eox; three trenches <br /> t to the six foot depth through each of the three island areas, <br /> ralleling Harding way. The excavated soil from these cuts were <br /> reened by a REGE geologist for odor and with a HM photoionizing <br /> tector (PID) . The trenches were advanced until no odor or <br /> tectable readings were found in an east-west direction. Once <br /> e contaminated soil was delineated in these trenched areas, <br /> cavating was performed in a north and south direction to the <br /> irteen foot depth. Samples obtained from the base of the middle <br /> £ land area indicate that the excavation was successful in <br /> moving the contaminated soil from this area, see Table 1 <br /> L2(EXC2A & 28) . To enable the backhoe to proceed deeper, rarps <br /> re constructed into the west and east pump island areas. The <br /> cavations of the western and eastern ► p i lands were then <br /> opened to the twenty foot depth. a t � e �„e <br /> On Octo r , 19 0 vapor extraction wells P1 <br /> k 3 were sampled and installed at the eastern and western pump <br /> p and excavations respectively. Soil sample results obtained <br /> %m the 30 and 40 foot depth of Pl show 2 ppm gasoline range <br /> ,drocarbons with minor amounts of BTEX*s. Soil sample results <br /> i' om P3 show 12 ppm gasoline range hydrocarbons at the 25 foot <br /> ' 411pth and 2 ppm gasoline range hydrocarbons at the 30 and 40 foot <br /> page 4 <br /> i <br />