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ARCHIVED REPORTS_XR0004571
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PR0507835
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ARCHIVED REPORTS_XR0004571
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Last modified
3/5/2020 12:26:21 PM
Creation date
3/5/2020 11:37:02 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0004571
RECORD_ID
PR0507835
PE
2950
FACILITY_ID
FA0007793
FACILITY_NAME
SUPER STOP MARKET
STREET_NUMBER
290
Direction
N
STREET_NAME
MAIN
STREET_TYPE
ST
City
MANTECA
Zip
95336
APN
22309101
CURRENT_STATUS
02
SITE_LOCATION
290 N MAIN ST
P_LOCATION
04
P_DISTRICT
003
QC Status
Approved
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SJGOV\sballwahn
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EHD - Public
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1 <br /> Geologzcaf?echntcs Inc Page 2 <br /> Groundwater Monitoring Report <br /> Project No 662 2 <br /> Decembei 22,2000 <br /> A groundwater gradient was calculated for the November 2000 groundwater monitoring <br /> ' event and found to be flowing S79°E at 0 0008 ft/ft Groundwater elevation and gradient <br /> data is summarized in Table 1, Appendix A Gradient direction is shown on Figure 2 <br /> Gradient Map, and Figure 3 Groundwater Gradient Rose Diagram <br /> ' 1.2 Groundwater Sampling Procedure <br /> ' On November 10, 2000, Don Light of Del-Tech mobilized to the site to conduct a <br /> groundwater monitoring of the three existing monitoring wells on site <br /> ' Before sampling was attempted the wells were sounded for depth to water and then a clear <br /> disposable bailer was used to determine if floating product was present The wells were <br /> ' purged of at least three well volumes of stagnant water using a dedicated Waterra check-ball <br /> assembly and '/2 inch tubing Purging continued until the temperature, conductivity, and pH <br /> of the groundwater stabilized (<10% variation between three readings) indicating that <br /> ' formation water representative of aquifer conditions was entering the wells These water <br /> quality parameters were measured at intervals of each well volume purged <br /> Once purging was complete, a water sample was collected from the Waterra tube Care was <br /> taken to minimize sample agitation Once the sample container was filled and capped, the <br /> bottle was inverted, tapped, and checked for headspace bubbles The sample container was <br /> ' identified and labeled with a unique designation, inserted into foam holders and placed in an <br /> ice chest cooled to 4°C for transport to the laboratory <br /> All non-disposable sampling equipment was decontaminated using a hot water washer and <br /> detergent before and between uses Disposable gloves were used by the technician to <br /> collect all samples and were changed with each sample collection <br /> ' A chain of custody document, listing all samples collected accompanied the samples from <br /> ' field to laboratory, thereby providing a means to track their movement and insure their <br /> integrity <br /> ' All water purged from each monitoring well and not used as a sample, was placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site until its proper <br /> disposition can be arranged <br /> ' Groundwater monitoring field logs are included in Appendix C <br /> 1 <br /> r <br />
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