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SITE INFORMATION AND CORRESPONDENCE
Environmental Health - Public
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2900 - Site Mitigation Program
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PR0506438
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SITE INFORMATION AND CORRESPONDENCE
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Last modified
10/31/2019 11:02:14 AM
Creation date
10/31/2019 10:42:40 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
SITE INFORMATION AND CORRESPONDENCE
RECORD_ID
PR0506438
PE
2960
FACILITY_ID
FA0007424
FACILITY_NAME
TEICHERT INDUSTRIAL LAND
STREET_NUMBER
2025
Direction
E
STREET_NAME
WEBER
STREET_TYPE
AVE
City
STOCKTON
Zip
95202
CURRENT_STATUS
01
SITE_LOCATION
2025 E WEBER AVE
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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EHD - Public
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i <br /> WATER QUALITY OBSERVATIONS <br /> + 1) All wells: Cl > Na indicating s <br /> � possible cationic exchange, which would occur with ' <br /> a brine. Note that this includes the background well (102 S. Wilson Way). This appears <br /> to be a regional characteristic as a result of impact by gasfield brines, deltaic/seawater <br /> encroachment and agribusiness discharge. <br /> 2) All wells:, proportion of Mg relative to Ca +� Mg is greater than 40%, possibly <br /> indicating a seawater-like component of contribution (encroaching deltaic water, connate <br /> waters from gas wells). <br /> 3) All wells including the background well have similar relative proportions of cations, <br /> in decreasing order: <br /> i Ca <br /> Mar <br /> a <br /> Na + K <br /> t 4) Wells MW7 and MW8 (in the former pickling operations area) and the background <br /> well (located approximately 2000 feet west of the property) have similar relative <br /> proportions of anions, in decreasing order: <br /> HCO3 <br /> C1 <br /> SO4 <br /> 5) Wells MW6 and MW9 (most distant onsite wells from former pickling operations) <br /> have similar relative proportions of anions, which are in a different decreasing order of <br /> importance: <br /> Cl <br /> HCO3 <br /> SO4 <br /> 1 <br /> 6) Absolute ionic concentrations in all wells are generally similar with the exception of <br /> chloride, which is somewhat elevated in MW6 and MW9. These two wells are not <br /> located in the area of former pickling operations. No clear trend of increasing chloride <br /> concentrations is evident in either of these wells. <br /> Conclusions are that shallow groundwater exhibits high background levels of objectionable <br /> analytes including TDS and chlorides. These background concentrations are a result of <br /> encroaching deltaic waters impacted by leaching of saline soils as well as regional impact from <br /> improperly abandonend gas wells and agribusiness operations in general. Impact from site <br /> operations is deminimis. <br /> gro md=\Wchertksi-hist 4 <br /> { <br /> li <br /> SII <br />
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