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Analytical Laboratory) for total sulphur analysis. The alternate laboratory reported similar total sulphur <br />results. They are: <br />Sample No. Enseco result D & M Labs result <br /> <br />MW-1B/0.5 <br />MW-1A/10.0 <br />MW-1B/10.0 <br />691 mg/Kg <br />202 mg/Kg <br />191 mg/Kg <br />737 mg/Kg <br />162 mg/Kg <br />187 mg/Kg <br />The similarity in total sulphur analysis from the two laboratories suggested a potential problem <br />with the sulfate analysis. However, D&M Laboratories confirmed the validity of the sulfate analysis and <br />in memorandum offered the following reasons for the incompatibility of the results: <br />There presently is no EPA-validated method for analyzing sulphur, and the efficiency of <br />EPA 6010, an ICP/AES method, is unknown. There is a possibility that sulphur does <br />not digest well by preparation method EPA 3050, which is used for soils. The sulfate <br />method, EPA 300.0, is EPA validated for water, and a leachate is prepared for soil. <br />This method probably recovers sulfate well; <br />The sample may not be homogenous, which would cause very different results to occur <br />from different aliquots taken. <br />A copy of D&M Laboratories memorandum is included in Appendix C. <br />4.3 GROUNDWATER INVESTIGATION <br />Groundwater beneath Parcel III was sampled in two monitoring wells. Monitoring well MW-1 <br />is located near the northeastern corner of Parcel III, north of the petroleum coke stockpile. Monitoring <br />well MW-4 is located just inside the southeast corner of Parcel III (Figure 2). Groundwater samples <br />collected from these wells were analyzed for: <br />CAM metals - TTLC - EPA 6010; <br />Chlorinated Pesticides and PCBs - EPA 608; <br />Organophosphate Pesticides - EPA 614; <br />Total Recoverable Petroleum Hydrocarbons (TRPH) - EPA 418.1; <br />Purgeable Halocarbons - EPA 601; <br />Purgeable Aromatic Halocarbons - EPA 602; <br />Elemental Sulphur - EPA 6010; <br />SAC28.013 <br />16 <br /> December 20, 1991 <br />T 714 "ST,: