Laserfiche WebLink
2 MAY 1999 SUBSURFACE INVESTIGATION <br /> Philip drove three borings, and collected soil and groundwater samples on May 18, <br /> 1999 to further assess the extent of petroleum impact Philip also performed a survey <br /> to locate off-site water wells in the vicinity of the project site Procedures and results <br /> of this investigation are described in the following sections <br /> 2.1 Investigation Procedures <br /> IPhilip utilized Gregg In Situ, Inc of Martinez, California to drive three CPT <br /> borings through soil and groundwater zones to depths of 80 to 90 feet bgs <br /> CPT depths were based on the historic lowest level of groundwater, which <br /> PHS/EHD reported occurred in 1978 The locations of borings CPT-1, CPT-2, <br /> and CPT-3, shown in Figure 2, were placed at hydraulically downgradient <br /> positions relative to the former USTs to evaluate the furthermost extent of <br /> groundwater impact CPT soundings and pore pressure dissipation tests were <br /> performed to assess soil strata and evaluate current depth to groundwater <br />' Permits to drive these borings were obtained from the PHS/EHD <br /> Soil samples were collected using Hydropunch rods, which were driven in <br /> adjacent holes to the CPT borings Groundwater samples were collected with <br /> bailers lowered through the rods, which were screened at the sampling depth <br /> Soil and groundwater sample depths were based on the CPT hydrogeologic <br /> data In each borehole, one soil sample was initially collected in the vadose <br /> zone dust above the groundwater table, and another soil sample was collected <br /> near the termination depth Also in each borehole, one groundwater sample <br /> was collected just below the top of the groundwater table, and another <br /> groundwater sample was collected near the termination depth <br /> Following collection, samples were capped in clean laboratory-provided <br /> containers, labeled, placed in an iced chest, and delivered to Acculabs Inc in <br /> Davis, California for chemical testing The soil and groundwater samples were <br /> analyzed for TPH-G and benzene, toluene, ethylbenzene, and xylenes (BTEX) <br /> rusing Method 8015/8020 Samples were also analyzed for MTBE, ETBE, <br /> TBA, TAME, and DIPE using Method 8260 <br /> 2.2 Sample Analytical Results <br /> All the CPT soil samples contained non-detectable concentrations of TPH-G, <br /> BTEX, and oxygenate compounds In addition, there were no detectable <br /> May 1999 Subsurface Investigation and Groundwater Monitoring Report <br /> The Earthgrains Company Facility <br /> 2651 South Airport Way <br /> Stockton California <br /> Prepared for THE EARTHGRAINS COMPANY Prepared by Philip Services Corp <br /> F 11217821121782EG1125997W599REP DOC June 22 1999 <br /> 5 <br />