WORK PLANS - Laserfiche WebLink

Home Browse Search

R "VO) A S S O C I A T E S I N C field screened with a Photo Ionization Detection (PID) and one soil sample_ p from each of , the borings will be submitted for laboratory analysis. Soil sample selection will be based on PID measurements and field observations (i.e. odor and soil discoloration). One groundwater sample will be collected from each boring at the depth groundwater is first I encountered anticipated to be approximately 6 feet b s. A Geo robe® Screen Point 15 Groundwater Sampler will be threaded onto the leading end of the Geoprobe® when the groundwater is encountered. While the sampler is advanced, O-ring seals and an expendable drive point will provide a watertight system to ensure sample integrity. When the tool has been advanced to the desired depth, extension rods will be sent downhole to brace the bottom of the sample screen as the tool casing is retracted. . When the casing is retracted, up to 41-inches of screen with slot sizes of 0.004 inches will be exposed. Teflon tubing with a check valve attached to one end will be inserted down the casing until it is immersed in groundwater. Water will then be pumped through the tubing and to the ground j surface by oscillating the tubing up and down. Following soil and groundwater sample collection, the borings will be backfilled with neat cement grout to the ground surface. Drill cuttings, if any, will be stored on-site in a 5-gallon container pending laboratory results. Sample Analysis The selected soil and groundwater samples from the CPT and Geoprobe9 borings will be immediately placed in a cooler with ice and delivered under chain-of-custody documentation to a State-certified analytical laboratory. Soil samples will be analyzed for TPHg by EPA Method 801513; benzene, toluene, ethyl-benzene, and xylenes (BTEX) by EPA Method 802113; and MTBE, tertiary-amyl-methyl ether (TAME), 1,2-dibromoethane (EDB), 1,2-dichloroethane 1,2- DCA), di-isopropyl ether (DIPE), ethyl-tertiary-butyl ether (ETBE), tertiary-butanol (TBA), ethanol (etOH), and methanol (meOH) by EPA Method 8260B. i Summary Report Preparation Upon completion of the soil boring installation, a Summary Report will be prepared and will include a description of site activities and an assessment of the extent and impact of the residual hydrocarbons. All work described in this workplan will be performed under the direction of a California Registered Geologist or Professional Engineer. All work will be performed in accordance with ATC's Site-specific Health and Safety Plan (HASP) contained in Attachment. 1 and Quality Control/Quality Assurance Plan contained in Attachment 2. y I s:\enviromental\25847\37\reports\wkp.doc 4 i �j r