|
` Additional Soil and Groundwater Investigation and
<br /> Monitor Well Installation Report
<br /> i
<br /> 1 CSUS Multi-Campus Regional Center
<br /> January,11,2002
<br /> 1 Page 5
<br /> The soil samples collected from the borings were analyzed for TPH-G and TPH quantified as kerosene,
<br /> diesel, and motor oil by EPA.Method 8015M; :for BTEX by EPA Method 8020; and for gasoline
<br /> oxygenates/additives by EPA Method 8260 or 8260B. The gasoline oxygenates/additives include MTBE,
<br /> 1 'ethanol,tertiary-Butanol, DIPS, ETBE, and TAME.
<br /> 4.0 MONITOR WELL INSTALLATION PROCEDURES
<br /> This section includes a description of the site preparation, drilling procedures, monitoring. well
<br /> installation, surveying, development, and' sampling procedures, and the laboratory analytical
<br /> methodology. -
<br /> t
<br /> 4.1 SITE PREPARATION
<br /> "A drilling permit application was prepared by Condor and submitted to the PHS/EHD for three proposed
<br /> +` groundwater monitoring wells. Condor received the drilling permit prior to initiating any fieldwork. The
<br /> i` proposed monitor well locations were marked with white paint and USA was notified 72 hours in advance
<br /> of the fieldwork to locate and identify underground utilities in and near the work area.However, because
<br /> I the monitor well locations were-on private property, some utilities contacted by USA did not mark their
<br /> " .-lines past property boundaries and on to the site. Therefore, it was the responsibility of the property owner
<br /> to locate and identify underground utilities in-and near the work area. The PHS/EHD was notified'of the
<br /> -f eldwork schedule 72 hours in advance.'
<br /> 4.2 DRILLING PROCEDURES
<br /> A Condor geologist was on site to supervise the work.'-Prior to commencement of fieldwork, a.tailgate
<br /> safety meeting was held and a site-specific.Health and Safety Plan was discussed with, and presented to;
<br /> all field personnel for their signatures.:
<br /> -. The investigation included the drilling and installation of three groundwater monitor wells (MW-1, MW-
<br /> 2, and MW-3) on December 10, 2001. The drilling method for the installation of the three monitor well-s
<br /> was hollow-stem auger..The drilling services were provided by Woodward Drilling Co., Inc. of Rio Vista,
<br /> California. The monitor well borings were- drilled using.8-inch outside diameter, continuous-flight,
<br /> hollow-stem auger. The hollow-stem. auger, and other-.'down-hole equipment were decontaminated
<br /> between borings-by steam cleaning to prevent cross_contamination.;Steam cleaning rinsate was placed in.
<br /> 55-gallon drums, sealed, labeled, and left on site where they will remain pending laboratory.analyses.
<br /> Disposal of hazardous materials, if any, will be the responsibility of CSUS.
<br /> Drill cuttings for the monitor well borings were logged according to the USCS. Geologic logs'were
<br /> prepared containing field observations including soil type, estimated moisture content, photoionization
<br /> detector (PID) measurements, and the presence of staining or odor. The geologic logs are included in
<br /> Appendix B. Drill cuttings were placed in 55-gallon drums, sealed, labeled, and left onsite where,they
<br /> will remain pending laboratory analyses. Disposal of hazardous' materials, if any, will be the
<br /> responsibility of CSUS.
<br /> 4.3 SOIL SAMPLING .
<br /> One soil sample was collected from,each monitor well-boring from near the capillary fringe. The soil
<br /> samples were.collected using a California-modified split-spoon sampler fitted with three clean, ..brass
<br /> liners. The soil samples were retained, undisturbed, in the brass tubes for laboratory analyses. The.tubes
<br /> were sealed at the ends with TeflonO sheeting,capped, and labeled. The samples were stored in a cooler
<br /> chilled with Blue Ice® and delivered under chain-of-custody procedures to Excelchem. The samples-were
<br /> analyzed using U.S. EPA Methods and California-approved methods.
<br /> CONDOR
<br />
|