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ARCHIVED REPORTS_XR0011571
Environmental Health - Public
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GRANT LINE
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2900 - Site Mitigation Program
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PR0503286
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ARCHIVED REPORTS_XR0011571
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Last modified
1/17/2020 1:13:31 PM
Creation date
1/17/2020 11:28:18 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011571
RECORD_ID
PR0503286
PE
2953
FACILITY_ID
FA0005766
FACILITY_NAME
MOBIL OIL BULK PLANT
STREET_NUMBER
500
Direction
E
STREET_NAME
GRANT LINE
STREET_TYPE
RD
City
TRACY
Zip
95376
APN
25027008
CURRENT_STATUS
01
SITE_LOCATION
500 E GRANT LINE RD
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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SJGOV\sballwahn
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EHD - Public
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constant rate pump test data were analyzed using the Theis equation for a confined aquifer and <br /> the Cooper-Jacob approximation to the Theis equation. Prior to the analysis, the pump test data <br /> were corrected using the Jacob correction for an unconfined aquifer. This correction is <br /> necessary to accurately predict drawdown in an unconfined aquifer. <br /> Both the Theis equation analysis and the Cooper-Jacob approximation to the Theis equation <br /> predicted the transmissivity and the storativity to be 1.3 x 10-2 feet squared per minute (W/min) <br /> and 1.0 x 10-4. <br /> AQUIFER PARAMETERS <br /> Well Hydraulic <br /> Number Conductivity Transmissivity Storativity <br /> AW-9 7.47 x 10' 1.35 x 10'2 1.0 x 10' <br /> NOTES: Hydraulic=dLXtMtY U In foot Per m"n .Ord 4 6saed m Tra+rmissivity -Hydraulic oonductivity x Sato tcd tAiclm 418.08 AWO <br /> TrwmiasMty is in foal agLO9W per mimm- <br /> Sto dvity is a tailless value. <br /> The average linear flow rate of ground water can be calculated from 1) the estimated background <br /> gradient across the site (0.01 foot per foot); 2) the value of hydraulic conductivity (7.47 x 1W); <br /> and 3) the estimated porosity of 35% (a conservative value for silts and clays). <br /> qa = K x dh/dl x 1/n <br /> Where: qa = average linear pore velocity <br /> K = hydraulic conductivity <br /> dh/dl = ground water gradient <br /> n = porosity <br /> Based on these values, the greatest average linear ground water velocity is approximately 11.2 <br /> feet per year. This velocity is equivalent to transport rate of a conservative (non-reactive) <br /> solute. <br /> 6.0 FINDINGS <br /> Results of the current and previous investigations are summarized as follows: <br /> • The site is located approximately 3,500 feet south of Highway 205 at an elevation of <br /> approximately 30 feet above mean sea level(NGVD-1929). Local topography is relatively <br /> flat, dipping slightly to the north. The site is bound by vacant lots to the east and south. <br /> Industrial properties are located to the north and west. <br /> 6 <br /> 'F <br /> E <br />
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