Laserfiche WebLink
_ • .n i�' "'y' � ah-YY.�fX! S.CUSA'£=Wt.ri iR <br /> Mr, Rc� Valinoti 3 <br /> r, July 25, 1989 <br /> Tho locations of the proposed soil samples are illustrated in cross-section <br /> on Figure 3. The orientations of the cross-sections are shown in the plan <br /> view on Figure 2. <br /> Camme 3 <br /> The proposed rationale for sampling the excavation area for diesel con- <br /> stit;rnts is acce--table only for the purpose of screening the removal area. <br /> Verification same Mg is recommended using Taburatory analyses <br /> EPA8010/8020; 8015 TPN, Volatile; 3550/8015 TPN, Extractable on those { <br /> samples collected to define the zero line" of vertical and lateral con- <br /> tamination migration. <br /> es onse 3 <br /> i <br /> After excavation and the collection of soil same ` <br /> Petroleum Hydrocarbons (TEPH) analysis will <br /> be rtes, Total Extractable <br /> of diesel-contaminated soil. After emoval hasbeensed the <br /> eTEpyoval <br /> analysis, samples will 4 <br /> l EP p l be analyzed using Environmental Protection Agency <br /> (EPA) methods 8010/8020, and Total Volatile <br /> confirm the removal of contaminated soil. Petroleum Hydrocarbons, to <br /> 5 f <br /> Dewatering activities proposed in order to facilitate deeper soils excava- <br /> i <br /> tion is acceptable provided the following concerns are considered and <br /> i addressed: <br /> a. . .Beta Associates [September 21, 1987, Project #195-1.1] suggests an q <br /> iF off-site contaminant plume in the vicinityof i <br />` extraction of groundwater from the excavaioair a waterrlevel <br /> measurements should be made and measurements continued throughout t <br /> the extraction process. $ <br /> b. In the event the presence of an off-site contaminant plume is <br /> substantiated, extraction from the tank area may draw the con- <br /> taminants into the capture zone of M14#1. We recommend prior <br /> sampling of the existing &#I and MW#2 by EPA 601 602 and TPH, <br /> Volatiles. / <br /> In Tight of the expressed concerns, the water in the. base of the excavation <br /> 2 will not be pumped. The soil sample from the floor of the,pit-_(Sample_—� <br /> , 4t _ Number 8 on _Figure_2)_wi_l-1-be-removed-from-below-the-water table. Add <br /> itionally,-only Well MW-2 will be purged prior to sampling t° indicate the T ! <br /> status of ground water .quaTity in the immediate vicinity <br /> of r <br /> F <br /> excavation. Y the .tank <br /> r _ <br /> �ws € <br /> � 3 <br /> i <br />