WORK PLANS - Laserfiche WebLink

Home Browse Search

NEI K L E I N F E L D E R Three (3) soil borings will be advance to depths of approximately 40 feet b.gs (see Plate 2). During the advancement of the borings, soil samples will be collected at five foot intervals for lithologic classification and qualitative field screening, with an organic vapor analyzer (OVA). The OVA measures ionizable compounds in air in parts per million by volume (ppmv). Lithologic classification will be based on the Unified Soil Classification System (USCS). Following completion of the drilling, a 2-inch diameter PVC well will be installed in each of the borings. An approximate fifteen to twenty foot screened interval will be used during . construction of the wells, with approximately 5 to 10 feet of Screen installed above and approximately 10 feet below first encountered groundwater. At this time we propose to submit a two soil samples for quantitative chemical analyses from each soil boring. One soil sample will be collected at a depth of approximately 15 feet bgs and one soil sample will be collected above first estimated groundwater at 25 feet bgs. The soil sample intervals submitted for analyses will also be based OVA readings and field observations from soil samples collected at approximate 5-foot intervals. After collection, the soil samples will be labeled, logged on a chain-of-custody, and immediately stored in an iced cooler. A total of six soil samples (two from each well boring) will be analyzed for the following: ➢ Total Threshold Limit Concentrations (TTLCs) of California Assessment Manual (CAM-17) metals by EPA 6000/7000 series; ➢ Volatile Organics by EPA Method 8260 ➢ Total Extractable Petroleum Hydrocarbons as referenced to diesel and Motor Oil [TPH-D/TPH- MO] by DHS/LUFT. ➢ Total Purgeable Petroleum Hydrocarbons as referenced to gasoline [TPH-G] by EPA 8015M The samples will be analyzed on a normal laboratory schedule requiring approximately two weeks (ten working days) for- completion unless the optional rush analytical turnaround time (TAT) is requested by the client at an additional charge. The wells will be surveyed for well location and elevation above mean sea level (msl) so that subsequent water level sounding data can be utilized in determining groundwater flow directions and gradient as described in Attachment B. Task 3.0 -Monitoring Well Development and Samplinz Approximately forty-eight hours after installation, the.new.monitoring wells will be developed to remove sediment-laden water from the bottom of the well and to increase the hydraulic radius of each well. Development will be performed using a pneumatic pump, suction pump or bailer and as generally described in Attachment B. Water level measurements will be made in the wells prior to development, and at the beginning of the sampling round prior to purging and sampling the wells. The depth to groundwater will then be measured in each well according to the protocol described in Attachment B. The depth 42162.E01 /ST04P141 Page 4 of 9 Copyright 2004,Kleinfelder,Inc. March 30,2004