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Sampling: Soil and or groundwater sampling will
<br />be conducted in accordance with federal, state,
<br />and local guidelines with the objective of obtaining
<br />representative samples of the subsurface materials.
<br />No two projects are alike, each requiring a thorough
<br />review of background information to establish an
<br />appropriate sampling plan. Some projects will allow
<br />for standard 3-volume well purging, while others
<br />call for low -flow purging. Leighton will include a
<br />site -specific sampling plan as part of the work plan.
<br />This sampling plan will identify the media to be
<br />sampled (e.g., soil, water, soil gas, etc.), the sampling
<br />procedures (e.g., drilling, trenching, push probe,
<br />monitoring well, etc.), the sample container (e.g.,
<br />glass jars, brass sleeves, EncoresTM, VOA vials, etc.),
<br />preservatives, sample handling, QA/QC objectives
<br />and chain -of -custody procedures.
<br />Decontamination/Disposal and Manifesting: Field
<br />equipment including drilling equipment, sampling
<br />materials and anything that may be introduced into
<br />the soil or groundwater will be decontaminated before
<br />use and between sampling points by washing in
<br />a mixture of liquinox (or similar) and water, rinsing
<br />in potable water, final rinsing with deionized water
<br />and be allowed to air dry. Investigation derived
<br />waste (IDW) and soil/groundwater generated during
<br />field investigations will be contained in 55-gallon
<br />DOT approved drums, appropriately labeled and
<br />transported under manifest to a permitted waste
<br />handling facility. Waste manifests will be signed by
<br />the City prior to transportation of the waste.
<br />Leighton will not store any hazardous substances
<br />for more than ninety (90) days, will not permit any
<br />accumulations in excess of the small quantity
<br />generator exclusion of 40 CFR Part 261, and will
<br />report to the appropriate regulatory agency any
<br />discharges or releases identified, but only upon
<br />approval from the City.
<br />Quality Assurance/Quality Control
<br />Quality Assurance/Quality Control is a vital part of any
<br />site investigation. Field activities will be conducted
<br />in accordance with the Leighton corporate QA/QC
<br />Plan. In addition, we will perform our services in
<br />accordance with project specific QA/QC requirements
<br />as addressed during the initial kick-off meeting for
<br />the project. Laboratory QA/QC will be performed
<br />for each method of analysis as required for the test
<br />method. The QA/QC data will be reported in summary
<br />form and include a description of the constituent, the
<br />specific test method, the date, the detection limit of
<br />the specific test method, the percent accuracy, the
<br />percent precision, and the signature of the laboratory
<br />manager or director. These forms will be included
<br />in the laboratory reports included as appendices
<br />to the final site investigation reports. Technical
<br />reports will be signed and stamped by a PG or PE.
<br />As an additional QA/QC measure, it is Leighton's'
<br />policy that all technical reports be reviewed by
<br />an independent (in-house) senior registered
<br />professional (PG or PE) not actively engaged in the
<br />project prior to final submittal.
<br />Site Investigation Reports
<br />Leighton will analyze field and laboratory data, and
<br />prepare a detailed site investigation report describing
<br />the various tasks of the investigation, including
<br />field and laboratory data, findings, conclusions,
<br />and recommendations. As projects vary in size and
<br />complexity, report format and appropriate illustrations
<br />will be discussed with the City before and during
<br />report preparation to ensure the reports will present
<br />the information accurately and effectively, based
<br />upon City needs. All appropriately illustrated reports
<br />(site maps, cross -sections, iso-concentration maps,
<br />groundwater gradient maps, etc.) will be organized
<br />in accordance with the requirements of the RFP and
<br />other project specific requirements. The reports will
<br />be signed by those who prepared it, and signed and
<br />stamped by the California -registered professional
<br />(PG or PE) overseeing the project. All technical
<br />reports will be issued draft reports to review and
<br />provide comments, prior to finalization.
<br />Leighton
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