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4.2 Laboratory Analyses and Laboratory Quality Assurance/Quality Control Q( A/QC) 4.2.1 Analyses Performed and Analytical Methods '~ The solid and water samples were hand-delivered on Thursday April 8, 1999 by Grant Environmental, Inc. to Barringer Laboratories Inc. (Barringer} in Golden, Colorado for analysis. The required analyses were specified in a letter transmitted with the samples from Grant to Barringer. The analyses performed included: • A whole-rock analysis of the CKD (BG-1) to determine the total elemental composition of the dust. The CKD was analyzed for the constituents listed in Table 4.1. This table also includes the analytical method and detention • Leachate analysis of the CKD and other solid materials was performed using the U. S. Environmental Protection Agency (EPA) Synthetic Precipitation Leaching Procedure (SPLP), SW-846 Method 1312 to determine the concentration of constituents in the leachate. The resulting leachates were analyzed for the constituents listed in Table 4.2. This table also includes the analytical method and detection limit. The SPLP is a rotary agitation method where constituents in the sample material are leached with an amount of extraction fluid equal to 20 times the weight of the sample material. About 100 grams of sample material is used in each leaching test. Extraction fluid #2 was used for the extractions. Extraction fluid #2 consists of a 60/40 weight percent mixture of sulfuric and nitric acids added to deionized water until the pH is adjusted to 5.1±0.05. The sample material and extraction fluid are placed in a glass extraction vessel that is rotated at 30 t 2 revolutions per minute for 18 ± 2 hours at a temperature of I 23 t 2 degrees Centigrade. After agitation, the extract liquid is decanted, filtered, and analyzed. The SPLP leaching solution is representative of the composition of precipitation for the western U. S. The leachates were simulated in the laboratory as they might form under natural conditions by leaching the solid sample with a synthetic precipitation solution. •~ Analysis of the groundwater samples for the constituents listed in Table 4.2. This table also includes the analytical method and detection limit. ' 4.2.2 Laboratory Quality Assurance/Quality Control With the exception of analyses for which no EPA analytical protocol was available, all analyses were conducted using EPA-approved methods specified in SW-846. Routine laboratory QA/QC procedures were used for the analyses. The QC measures included duplicate samples, matrix spike samples, and certified standards. Duplicate samples were analyzed to determine the reproducibility of