Laserfiche WebLink
Site Characterization Work Plan <br /> ABF Freight System,Inc <br /> Manteca,California .. Page 7 <br /> split spoon sampler Each soil sample will be screened for odors and screened with a <br /> photoiomzation detector (PID) which measures concentrations of volatile organic compounds <br /> (VOCs) relative to an isobutylene standard <br /> Depth to groundwater was observed in the UST excavation at a depth of approximately 11 feet <br /> bgs Soil samples from above and below the water table and a grab groundwater sample will be <br /> collected from each monitoring well borehole Groundwater samples will also be collected from <br /> each monitoring well after well construction and development <br /> The monitoring well located in the former UST excavation area will be extended to <br /> approximately 30 to 40 feet in depth, depending on subsurface conditions encountered during <br /> drilling of this well Soil samples will be collected using a split spoon sampler every 10. feet <br /> beginning 5 feet below ground surface (bgs) After soil sample retrieval, Hydropunch II <br /> equipment will be used to collect groundwater samples with depth The Hydropunch sampling <br /> tip will be driven four feet beyond the existing boring depth into undisturbed aquifer material <br /> prior to sampling Once the Hydropunch sampling tip reaches the desired sampling depth the <br /> sampling screen is exposed and groundwater is collected <br /> The soil samples, grab groundwater samples, and groundwater samples collected from the <br /> monitoring wells after well development will be analyzed for TPH-D (EPA 8015M), BTEXM <br /> (EPA 8020), and Oxygenates (EPA 8260) <br /> . 5.5 Monitoring Well Construction <br /> Four monitoring wells will be installed, one at the former UST excavation pit and three perimeter <br /> wells The perimeter well locations will be determined from groundwater flow direction <br /> information acquired through regulatory file review <br /> The monitoring well located in the former UST excavation area will be drilled to approximately <br /> 30 to 40 feet in depth in order to characterize vertical extent of hydrocarbon contamination After <br /> soil and groundwater sampling is complete the borehole will be back-grouted to 20 feet, the <br /> depth to which the monitoring well will be completed The wells will be constructed of 2-inch <br /> PVC well casing with 0 010-inch slotted perforations from approximately 12 feet to the total s�tJ <br /> depth of the well (20-40 feet) The annular space of each borehole will be bac i ed with #2 <br /> sand from 1 foot above the top of the screened interval to total depth The wells will be sealed <br /> with a 1 foot thick bentonite chip layer and a sand/cement grout from the ground surface to the <br /> top of the bentonite pellets All wells will be installed in underground, water-tight vault boxes <br /> 5.6 Monitoring Well Development and Sampling <br /> After well installation is complete, CAL INC will develop and sample each well The wells will <br /> be developed by using a combination of bailing and pumping with a centrifugal pump After well <br /> development is complete, the wells will be sampled using a disposable polyethylene bailer The <br /> water samples will be analyzed for TPH-D, BTEXM, and Oxygenates <br /> IISERVER]1C-DR1VE\PR0JECTS132721PIans and ReportslABF Fina]Site Characterization Work Plan doe <br /> 6123198 <br />