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ARCHIVED REPORTS XR0001039
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ARCHIVED REPORTS XR0001039
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Entry Properties
Last modified
3/6/2019 7:03:33 PM
Creation date
3/6/2019 4:16:04 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0001039
RECORD_ID
PR0544236
PE
3526
FACILITY_ID
FA0024238
FACILITY_NAME
JM EQUIPMENT COMPANY
STREET_NUMBER
1245
Direction
W
STREET_NAME
CHARTER
STREET_TYPE
WAY
City
STOCKTON
Zip
95206
APN
16323034
CURRENT_STATUS
02
SITE_LOCATION
1245 W CHARTER WAY
P_LOCATION
01
QC Status
Approved
Scanner
WNg
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EHD - Public
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Geologicat 7-CCkxccs MC Page 3 <br /> 1"Quarter 2005 Groundwater Monitoring Report <br /> Project No 507 2 <br /> April 18, 2005 <br /> The following procedure is used to calculate vertical groundwater gradient <br /> • Determine the vertical distance between the two measuring devices by the distance from <br /> the nud-point between the top and bottom seal of the deep well (MW-109) and the mid- <br /> point between the groundwater elevation and the bottom seal in the shallow well (MW-9) <br /> ' • Measure the head in both wells used in the calculations <br /> • If the lateral distance between the well pair is greater than a few feet, then calculations <br /> must be made to correct the down-gradient piezometric head to account for the sloping <br /> water table between the wells The calculation considers the slope of the water table and <br /> the distance in a down-gradient direction between the two wells used in the calculations <br /> ' Figure 2 shows the location of the well cluster used for calculating the vertical groundwater <br /> gradient in this report, MW-9 and MW-109 Table 1 shows Summary of Water Level and <br /> Gradients Slope and Bearing, and Table 2 shows the calculated vertical gradients The <br /> information used in the calculations is shown below <br /> Vertical gradient calculation formulas are as follows <br /> • Vertical correction for gradient [(gw gradient slope) x (distance) = vertical correction] <br /> • Vertical head [(head of deep well) - (head of shallow + correction) =vertical head] <br /> • Vertical gradient [(vertical head) / (vertical distance) =vertical gradient] <br /> For the February 2005 monitoring event a vertical gradient was calculated for the MW- <br /> 9/MW-109 pair The vertical gradient was negative (a downward direction) at 0 0065 ft/ft, <br /> and this is consistent with the historical negative gradients at the site <br /> ' 1.2 Groundwater Sampling Procedure <br /> On February 17, 2005, Don Light of Del-Tech mobilized to the site to conduct groundwater <br /> ' monitoring of the site's eleven monitoring wells Before sampling was attempted, the wells <br /> were sounded for depth to water and then a clear disposable bailer was used to determine if <br /> floating product was present No free product was noted for this event The wells were <br /> ' purged of at least three well volumes of stagnant water using a dedicated Waterra check-ball <br /> assembly and '/z inch tubing or centrifugal pump Purging continued until the temperature, <br /> conductivity, and pH of the groundwater stabilized (<10% vanation in three consecutive <br />' readings), indicating that formation water representative of aquifer conditions was entering <br /> the wells These water quality parameters were measured at intervals of each well volume <br />' 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 a foam holder and placed into <br /> an ice chest cooled to 4°C for transport to the laboratory <br />
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