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ARCHIVED REPORTS XR0001010
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544236
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ARCHIVED REPORTS XR0001010
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Entry Properties
Last modified
3/6/2019 8:02:44 PM
Creation date
3/6/2019 4:03:29 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0001010
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
Tags
EHD - Public
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r4e*g"t nckrursInc Page 3 <br /> ' 1S'Quarter 2003 Groundwater Monitoring Report <br /> Project No 507 2 <br /> May 15,2003 <br /> ' Figure 2 shows the location of the well cluster used for calculating the verticalg roundwater <br /> gradient in this report, MW-9 and MW-109 Table I 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 March 2003 monitoring event a vertical gradient was calculated for the MW-9/MW- <br /> 109 pair The vertical gradient was negative (a downward direction) and approximately 0 6 <br /> times the magnitude of the horizontal gradient of the water table <br /> 1.2 Groundwater Sam lin Procedure <br /> P g <br /> ' On March 18, 2003, 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 1/2 inch tubing Purging continued until the temperature, conductivity, and pH <br /> of the groundwater stabilized (<10% variation in three consecutive 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 a foam holder and placed into <br /> ' an 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 the movement of and insure the <br />' integrity of the samples <br /> 1 <br />
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