ARCHIVED REPORTS_XR0005335 - Laserfiche WebLink

Home Browse Search

21 February 2000 AGE-NC Project No. 95-0185 Page 2 of 8 18% hydrochloric acid as a sample preservative and one 1-liter amber bottle without preservative. After collection, the samples were placed in a chilled container and transported under chain-of- custody to McCampbell Analytical Inc. (MAI) in Pacheco, California. The samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline and diesel (TPH-g and TPH-d) in accordance with EPA methods 8015 Modified and • Volatile aromatic compounds(benzene, toluene, ethylbenzene and total xylene: BTEX) and methyl tertiary butyl ether (MTBE) in accordance with EPA methods 8020. ' 2.3. PROBE BORINGS AND SAMPLING On 29 July 1999,a total of six soil probe borings (P6 through P11) were advanced at the site and off the site north, east and northwest of the former UST location. Probe borings were advanced in the '. area of the former USTs to collected soil samples. While five boring were advanced specifically to collected grab water samples. Probe borings P6, P7, P8, P9 and PI 1 were advanced to a depth of 20 feet bsg. Soil probe boring P10 was advanced to a depth of 35 feet bsg. Locations of the soil probe borings are illustrated on Figure 2. Probe borings for soil sampling were sampled using a Geoprobe soil sampling device loaded with four six-inch by 1.125 inch brass sleeves. The soil samples were collected at five-foot intervals. The second sleeve, collected from a depth of approximately eight feet bsg was covered with Teflon sheets, capped and sealed with tape. All samples were labeled uniquely. ' Soil samples preserved for laboratory analysis were placed in a chilled container, under ice,and were transported to MAI under chain-of-custody. The sampling equipment was washed in an Alconox ' solution and rinsed with water prior to each sampling run to avoid cross-contamination. ' 2.4. GRAB GROUND WATER SAMPLE COLLECTION Probe borings established for the collection of grab water samples were advanced with an empty ' - -- --- Geoprobe.soil sampling device(2-inch): A-temporary,=pre-cleaned one-inch 0.01-slotted temporary=- -_�---- well screen was placed into the soil boring to a depth of 20 feet bsg. After sample retrieval,the water ' sampler was disassembled and cleaned. New Teflon tubing was used to collect each sample. Each ground water sample was extracted by lowering a modified Teflon bailer into the screen section of • the temporary wells. Samples were collected in three I aboratory-supplied, 40-m1 VOA vials. ' containing 0.5 ml hydrochloric acid(18%)as a sample preservative and into-one 1-liter amber bottle, Advanced GeoEnvironmental,Inc.