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ARCHIVED REPORTS XR0011363
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544624
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ARCHIVED REPORTS XR0011363
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Entry Properties
Last modified
7/3/2019 7:29:27 PM
Creation date
7/3/2019 4:01:48 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011363
RECORD_ID
PR0544624
PE
3526
FACILITY_ID
FA0005206
FACILITY_NAME
GEORGES SERVICE
STREET_NUMBER
1600
Direction
W
STREET_NAME
DURHAM FERRY
STREET_TYPE
RD
City
TRACY
Zip
95376
APN
25510004
CURRENT_STATUS
02
SITE_LOCATION
1600 W DURHAM FERRY RD
P_LOCATION
99
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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Geological 7ech4faInc Page 3 <br /> Groundwater Monitoring Report <br /> Project No 425 2 <br /> December 5, 2002 <br /> I' This site has experienced both negative (downward) vertical gradients and positive <br /> (upward) vertical gradients Typically, the negative vertical gradients are 1 75 to 2 tunes <br /> greater than gradients in a horizontal direction and the positive vertical gradients are an <br /> order of magnitude greater than horizontal <br /> Positive vertical gradient dominates and may be the main reason for preventing these <br /> contaminants from impacting the deeper aquifer <br /> Refer to Table 3 of Appendix A for a summary of the vertical gradient calculations <br /> ' 1.2 Groundwater Sampling Procedure <br /> On September 11, 2002, Del-Tech Geotechnical Support personnel arrived on-site, opened <br /> ' the wells, and measured the depth to water with an electrically actuated sounding tape The <br /> water level reading was recorded to an accuracy of 0 01 foot In wells where free-floating <br /> product was suspected, a clear disposable bailer was used to gauge the interface Free <br /> ' product was evident in well MW-2 <br /> Stagnant water in the well casing was purged using a Centrifugal pump as recorded in the <br /> field logs (Appendix C) The rate of well purging was monitored The wells were purged <br /> of at least three casing volumes or until the groundwater parameters (temperature, <br /> conductivity, and pH) had stabilized (Appendix C) indicating that water representative of <br /> ' actual aquifer conditions was entering the well Groundwater parameter stabilization was <br /> characterized by three successive readings within 10% <br /> ' Before a sample was collected, the well's water level was allowed to recharge to at least <br /> 80% of its initial level All water removed from the monitoring wells and not used as a <br /> ' sample was placed in a properly labeled 55 gallon DOT (Department of Transportation 17- <br /> H) approved container and temporarily stored on-site <br /> ' A stainless steel bailer was used to collect each sample Extreme care was exercised while <br /> collecting samples to prevent agitation of the water contained in the bailer Water samples <br /> were transferred from the bailer into 40-m1 VOA vials preserved with hydrochloric acid <br /> ' using a bottom-emptying device that minimizes sample aeration during transfer of the <br /> sample All samples were checked for headspace bubbles, labeled, inserted into foam <br /> holders and placed into an ice chest cooled to 4°C for transport to the laboratory <br /> ' The sampling technician wore disposable gloves while collecting all samples <br /> iA chain of custody document, listing all samples collected and their intended analyses, <br /> accompanied the samples from field to the laboratory, thereby providing a means to track <br /> the movement and insure the integrity of the samples <br />
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