Laserfiche WebLink
PUG 17 '99 15:11 FR LFR ROSEA LLE 916 786 0366 TO 9-12094683433 P.051/08 <br /> GRAFT • • LFR Levine-Fricke <br /> • Task 2: Soil-Vapor Extraction and Groundwater Monitoring Well Installation <br /> • Task 3: Testing of the Soil-Vapor Extraction Well Network <br /> • Task 4: Surface-Water Sample Collection <br /> The Scope of Work also includes updating the site-specific health and safety plan, <br /> obtaining the necessary permits from the San Joaquin County Environmental Health <br /> Department (SJCEHD), and Work Plan approval from the RWQCB and SJCEHD. <br /> Task 1: Lithologic and Deeper Groundwater Investigation <br /> Further assessment of subsurface lithology will be conducted at the five locations shown <br /> on Figure 5 using a Cone Penetrometer(CPT) rig (ASTM Standard D 3441-86). At <br /> each proposed location, a CPT cone will be advanced to a maximum depth of <br /> approximately 80 feet bgs to assess the presence of more permeable intervals within the <br /> shallow groundwater interval and fine-grained (e.g., less permeable) intervals that may <br /> separate shallow groundwater from deeper groundwater. The lithologic data obtained <br /> from the CPT borings will be used to select sampling depths for deeper (vertical extent) <br /> groundwater assessment. <br /> Groundwater samples will be collected at locations adjacent to the CPT lithologic boring <br /> locations using a Powerpunchm-type sampling device advanced using a CPT rig. The <br /> specific depth intervals for samples will be determined based on the results of the <br /> lithologic characterization described above. It is anticipated that up to three depth- <br /> discrete groundwater samples will be collected at depths of approximately 40, 60, and <br /> 80 feet bgs to assess the vertical extent of petroleum hydrocarbons in groundwater. <br /> Groundwater samples will be submitted to a state-certified laboratory and analyzed for <br /> TPHg using EPA Method 5030/8015, TPHd and TPHo using EPA Method 8015, and <br /> BTEX and MtBE using EPA Method 8260. <br /> Task 2: Soil-Vapor Extraction and Groundwater Monitoring Well Installation <br /> Based on data obtained from the soil-vapor survey and the SVE test, 14 SVE wells and <br /> one groundwater monitoring well will be advanced at the approximate locations <br /> illustrated on Figure 5 using the hollow-stem auger method. The SVE well soil borings <br /> and the groundwater monitoring boring will be advanced to approximate depths of 10 <br /> and 20 feet bgs, respectively_ During drilling, an LFR geologist will collect soil <br /> samples at 5-foot intervals and screen the collected samples for volatile organic <br /> compounds (VOCs) using a photoionizadon detector. Soil samples for possible <br /> laboratory analysis will be collected in clean 2 inch by 6 inch brass sample liners and <br /> immediately capped, labeled, and placed in an ice-chilled cooler for transportation to the <br /> analytical laboratory. Soil samples will be submitted to a state-certified laboratory and <br /> analyzed for TPHg using EPA Method 5030/8015, TPHd and TPHo using EPA <br /> Method 8015M, and for BTEX and MtBE using EPA Method 8260. <br /> ho�t.rcr.wp:FBF Page XI <br />