Site-Specific Health and Safety Plan (HASP) - Laschools.org

the reported SQLs take into account sample characteristics and analytical adjustments,
they are the most relevant quantitation limits for evaluating nondetected chemicals.
6.2.3 Detection Limit Goals
To define analytical data reporting limits that meet project DQOs, potential risk-based
screening criteria were identified. Risk-based preliminary remediation goals (PRGs) for
residential soil, California and Federal MCLs and tap water PRGs were reviewed to
identify potential action levels that may be applicable to the site and achievable by the
laboratory. PQLs supplied by the laboratory are compared against Table 6-2 action
levels. PQLs for vapor analysis (TO-15) are supplied in Table 6-3. Since soil gas
samples will be analyzed by TO-15, screening criteria are not appropriate and will not be
included in Table 6-3.
6.2.4 Practical Quantitation Limit
The practical quantitation limits are the lowest matrix-specific concentrations that can be
reliably achieved within specified limits of precision and accuracy during routine
laboratory operating conditions. All sample results will be reported at or above the MDL
for each analyte. All results above the MDL, but below the PQL, will be qualified in the
data deliverable from the laboratory with a “J” flag. The “J” flag will denote the sample
result as below the PQL. Where practical, MDLs must be lower than the risk-based
criteria determined for the project. Laboratories must verify the PQLs by analyzing a
standard at or below the PQL when performing the initial calibration curve.
Reporting limits are the lowest reported concentration provided on the sample-analysis
data report, after corrections have been made for sample dilution, sample weight, and (for
soils and sedimnts) amount of moisture in the sample. Reporting limits can be as low as
the MDL or exceed the PDL, depending on the matrix effects encountered during the
analysis. The reporting limit is the value that indicates whether the analytical DQOs
have been achieved for that sample.
6-3
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