Laserfiche WebLink
1 1 <br /> Work Plan for Additional Subsurface Assessment,Former Unocal Station#0123 <br /> . October 5, 1999 <br /> feet bgs The boring will be advanced hydraulically using a GeoProbe® or similar direct-push <br /> technology GR's Field Methods and Procedures are included in Appendix A To implement this <br /> scope of work, GR proposes the following four tasks <br /> Task 1. Pre-field Activities <br /> GR will prepare a site-specific safety plan and obtain the necessary soil boring permit <br /> from SJCPHS-EHD and encroachment permit from the City of Tracy Public Works <br /> Department USA will be notified at least 48 hours prior to initiating field work <br /> Task 2. Soil Borings <br /> GR'will advance one soil boring at the location shown on Figure 3 The boring will be <br /> cleared to 5 feet by hand auger, then advanced to approximately 12 feet bgs by a <br /> California-licensed well driller using a GeoProbe®or similar equipment that advances the <br /> boring equipment hydraulically without generating soil cuttings A GR geologist will <br /> monitor the field activities and prepare a log of the boring Soil samples for chemical <br /> analysis will be collected at 5-foot intervals Soil samples will be collected with a 1-inch <br /> diameter split spoon sampler lined with clean acrylic or brass tubing Soil from each <br /> sampled interval will be screened in the field for the presence of petroleum hydrocarbons <br /> We anticipate one unsaturated soil sample for analysis A grab groundwater sample will <br /> also be collected Soil and grab groundwater samples will be submitted for chemical <br /> analysis as described in Task 3 Upon completion the boring will be filled to ground <br /> surface with neat cement to approximately 5 feet bgs The auger cuttings generated <br /> during clearing will then be placed back in the boring and compacted The boring will be <br /> completed at the surface with asphalt patch as required by the City of Tracy guidelines <br /> Task 3. Laboratory Analyses <br /> Soil and grab groundwater samples will be submitted for chemical analysis at Sequoia <br /> Analytical, a California state-certified Hazardous Material Testing Laboratory (ELAP 4 <br /> #1210, #1271, and #1624) Soil and grab groundwater samples will be analyzed for _�— <br /> TPHg, TPHd, and benzene, toluene, ethylbenzene, xylenes (BTEX), by the DHS LUFT <br /> method, and HVOCs by EPA Method 8010 <br /> Task 4. Report Preparation <br /> Following receipt and analysts of all data, a report will be prepared which summarizes <br /> the procedures and findings associated with this investigation This report will be <br /> submitted to Chevron for its use and distribution <br /> PROJECT STAFF , <br /> Mr Stephen J Carter, a Registered Geologist in the State of California (R G No 5577), will <br /> provide technical oversight and review of the work Mr Greg Gurss, Senior Project Manager, <br /> / <br /> 240073 03 3 <br />