FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Groundwater monitoring wells MW 1 and MW2 were drilled to 31 feet bgs and soil samples were collected from the capillary fringe zone at approximately 16 feet bgs for laboratory analysis. The wells were constructed using 2 -inch diameter PVC casing with 0.010 inch slotted screen installed from the bottom of the borings to a depth of 11 feet bgs. The annulus was completed with #3 sand filter pack from the bottom of the borings to approximately 9 feet bgs. After placing the filter pack, the wells were developed by pumping until the water became clear. Groundwater samples were collected after the wells recovered at least 80%. Development purge logs are included in Appendix D. After developing and sampling, the annulus was filled with 2 feet of hydrated bentonite pellets above the sandpack and neat cement slurry to the ground surface. Locking monument well head covers were placed over each monitoring well. Boring logs and well completion details are included in Appendix C. r 3.2.2 Laboratory Analysis Soil and water samples collected from the borings and monitoring wells were analyzed by Argon Laboratories (FLAP #1873) for total petroleum hydrocarbons as gasoline (TPHg) using EPA modified method 8015; and benzene, toluene, ethylbenzene, total xylenes (BTEX) and methyl tert-butyl ether (MTBE) using EPA Method 8020. In addition, soil samples collected from boring SB8 at depths of 25 and 36 feet bgs were analyzed by A&L Western Agricultural Laboratory (FLAP #1657) for physical, biological, and chemical parameters including particle size analysis, moisture content, bulk density, total organic carbon (TOC), aerobic and anaerobic plate count, and phosphorus, potassium, nitrogen (PKI). All soil samples collected from the capillary fringe had non-detectable TPHg, BTEX, and MTBE. The saturated soil sample collected at 25.5 feet bgs from SB8 contained low to moderate concentrations of TPHg and BTEX, and the samples at 41 and 45.5 feet bgs from SB8 had non-detectable TPHg, BTEX, and MTBE. Soil analytical results are summarized in Table y 1. Laboratory Reports are included in Appendix E. ground=\ranuioklosure 6