Laserfiche WebLink
F ns Engineering Science, Inc. <br /> no detections of TPHg.o,ine or TPHfuel fingerprint by EPA Modified Method SW8015. Therefore <br /> TPH analysis will not be performed on the groundwater samples proposed herein. <br /> Quality assurance/quality control requirements for field and analytical laboratory operations <br /> (i.e., sample handling, containers and sample volumes, field duplicates, trip blanks, <br /> calibration, surrogates, and reporting limits) will be as specified in Section 4 of the Phase II <br /> RI Work Plan (Parsons ES, February 5, 1997). <br /> SITE CONTROL, RESTORATION AND DECONTAMINATION <br /> When field investigation activities are <br /> g being conducted in areas of pedestrian or vehicle <br /> traffic, the work area will be cordoned off with barricades, traffic cones, and/or "caution" <br /> tape. No personnel shall enter the work area without appropriate safety equipment, as <br /> discussed in the site Health and Safety Plan (Parsons ES, July 1996). <br /> After sampling is complete, each sampling location be restored as closely to its original <br /> condition as possible. Holes created by direct push drilling equipment in friable soils tend to <br /> squeeze shut soon after extraction of the probe. All test holes will be sealed with grout and <br /> patched with asphalt to eliminate any creation or enhancement of contaminant migration <br /> pathways to the groundwater. <br /> Holes shall be abandoned by tremie-grouting; the grout shall consist of a mixture of 100 <br /> gallons potable water, seven sacks of portland cement and one sack of pure sodium bentonite <br /> powder. Any holes grouted to the surface shall be flush with existing surface when the grout <br /> is fully cured. <br /> All drilling and sampling equipment will be decontaminated between sample locations by <br /> washing and steam cleaning. CPT probes are washed in a self-contained steam cleaning box <br /> located beneath the draw works under the truck. <br /> MANAGEMENT OF INVESTIGATION-DERIVED WASTE <br /> Subsurface investigations with hydraulic push probes such as CPT generate little or no soil <br /> waste. However, should any such waste be generated, soil and personal protective equipment <br /> (PPE) waste will be drummed together and will be temporarily stored at the site pending <br /> receipt of profile sample analytical results at which time the solid investigation derived waste <br /> (IDW) will be properly disposed off-site. All soil cuttings shall be containerized on site in <br /> U.S. Department of Transportation (DOT)-approved, steel, 55-gallon drums with plastic <br /> drum liners <br /> Liquid IDW from steam cleaning and groundwater sampling will be containerized on site in <br /> 55-gallon steel drums pending chemical analysis and disposal. At present the City of <br /> Stockton special discharge permit limit for water discharged to the sanitary sewer is ND (less <br /> than 0.5 µg/L) for chlorinated volatile organic compounds. If laboratory analytical results <br /> meet this criterion, the water will be discharged on-site at the sewer lift station north of <br /> Building 3. If contamination is detected, the water will be removed for off-site treatment by <br /> a licensed waste hauler or subcontractor. <br /> 0997\09072\wks2add 12-18-97 3-5 <br />