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ARCHIVED REPORTS_XR0010548
Environmental Health - Public
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2900 - Site Mitigation Program
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PR0507911
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ARCHIVED REPORTS_XR0010548
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Last modified
5/8/2020 12:12:09 PM
Creation date
5/8/2020 11:33:49 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010548
RECORD_ID
PR0507911
PE
2950
FACILITY_ID
FA0007834
FACILITY_NAME
CIRCLE K #8671
STREET_NUMBER
8606
STREET_NAME
THORNTON
STREET_TYPE
RD
City
STOCKTON
Zip
95209
APN
07242019
CURRENT_STATUS
01
SITE_LOCATION
8606 THORNTON RD
QC Status
Approved
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LSauers
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EHD - Public
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Y <br /> Groundwater Sample Collection <br /> After wells are purged, or not purged, according to TSR instructions, samples are collected for <br /> laboratory analysis For wells that have been purged using conventional pump or bail methods, <br /> sampling is conducted after the well has recovered to 80 percent of its original volume or after <br /> two hours if the well does not recover to at least 80 percent If there is insufficient recharge of <br /> water in the well after two hours, the well is not sampled <br /> Samples are collected by lowering a new, disposable, 1/2-inchto 4-inch polyethylene bottom-fill <br /> bailer to dust below the water level in the well The bailer is retrieved and the water sample is <br /> carefully transferred to containers specified for the laboratory analytical methods indicated by <br /> the TSR Particular care is given to containers for volatile organic analysis (VOAs) which <br /> require filling to zero headspace and fitting with Teflon-sealed caps <br /> After filling, all containers are labeled with project number (or site number), well designation, <br /> sample date, and the samplers initials, and placed in an insulated chest with ice Samples <br /> remain chilled prior to and during transport to a state-certified laboratory for analysis Sample <br /> container descriptions and requested analyses are entered onto a chain-of-custody form in order <br /> to provide instructions to the laboratory The chain-of-custody form accompanies the samples <br /> during transportation to provide a continuous record of possession from the field to the <br /> laboratory If a freight or overnight carrier transports the samples, the carrier is noted on the <br /> form <br /> For wells that have been purged using low-flow methods, sample containers are filled from the <br /> effluent stream of the bladder or peristaltic pump In some cases, if so specified by the TSR, <br /> samples are taken from the sample ports of actively pumping remediation wells <br /> Sequence of Gauging, Purging, and Samphng <br /> The sequence in which monitoring activities are conducted are specified on the TSR In <br /> general, wells are gauged beginning with the least-affected well and ending with the well that <br /> has highest concentration based on previous analytic results After all gauging for the site is <br /> completed, wells are purged and/or sampled from the least-affected well to the most-affected <br /> well <br /> Decontamination <br /> In order to reduce the possibility of cross-contamination between wells, strict isolation and <br /> decontamination procedures are observed Portable pumps are not used in wells with LPH <br /> Technicians wear nitrile gloves during all gauging, purging and sampling activities Gloves are <br /> changed between wells and more often if warranted Any equipment that could come in contact <br /> with fluids are either dedicated to a particular well, decontaminated prior to each use, or <br /> discarded after a single use Decontamination consists of washing in a solution of Liqui-nox <br /> and water and rinsing twice The final rinse is in deionized water <br /> Exceptions <br /> Additional tasks or non-standard procedures, if any, that may be requested or required for a <br /> particular site, and noted on the site TSR, are documented in field notes on the following pages <br /> 115104 version <br />
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