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2900 - Site Mitigation Program
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PR0522692
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Last modified
4/2/2020 2:36:03 PM
Creation date
4/2/2020 2:28:53 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
WORK PLANS
RECORD_ID
PR0522692
PE
2957
FACILITY_ID
FA0015465
FACILITY_NAME
FORMER MONTGOMERY WARDS AUTO SRV CTR
STREET_NUMBER
5400
STREET_NAME
PACIFIC
STREET_TYPE
AVE
City
STOCKTON
Zip
95207
APN
10227008
CURRENT_STATUS
01
SITE_LOCATION
5400 PACIFIC AVE
P_LOCATION
01
P_DISTRICT
002
QC Status
Approved
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EHD - Public
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4-inch-diameter PVC casing and range in depth from 26 to 91 feet. The sealing material will consist of <br /> neat cement grout (grout) which will be introduced through the annulus of the augers with a tremie <br /> pipe, if required by the SJCEHD grout inspector, and will be added from the total depth of each boring <br /> to a depth of approximately 5 feet. The remaining 5 feet of annulus will be backfilled with either grout, <br /> sand, or native soil obtained from the drill outs. The top approximately 6 inches of each boring will be <br /> backfilled with concrete and dyed black at the surface (as needed) to blend in with the surrounding <br /> asphalt. <br /> Overdrilling Nested 2-Inch-Diameter and 3-Inch Diameter PVC Wells Using a Hollow- <br /> Stem Auger Drilling Rig <br /> Nested wells VEW-6AB, VEW-7AB, VEW-BAB, VEW-9A/B, VEW-10A/B, VEW-IIAB, <br /> VEW-12A/B, and VEW-13AB will be destroyed by overdrilling the casing and annulus to the total depth <br /> of each well using a hollow-stem auger drilling rig equipped 15-inch-diameter augers with a self-centering <br /> "stinger" bit. The larger diameter augers are necessary to ensure that each of the nested wells are <br /> destroyed simultaneously. If the self-centering "stinger bit' should malfunction or be deemed unsuitable, <br /> appropriately sized drilling rods will be placed down the annulus of the 3-inch-diameter well and angered <br /> around to ensure the augers stay centered on the wells. These wells were installed using 10-inch-diameter <br /> augers, are constructed of 2- and 3-inch-diameter PVC casing and range in depth from 31 to 60 feet. <br /> Grout will be introduced through the annulus of the augers with a tremie pipe, if required by the SJCEHD <br /> grout inspector, from the total depth of each boring to a depth of approximately 5 feet. The remaining <br /> 5 feet of annulus will be backfilled with either grout, sand, or native soil obtained from the overdrilling. <br /> The top approximately 6 inches of each boring will be backfilled with concrete and dyed black at the <br /> surface(as needed)to blend in with the surrounding asphalt. <br /> Overdrilling 1-Inch-Diameter PVC Wells Using Sonic and Hollow-Stem Auger Drilling <br /> Rigs <br /> Wells AS-14, AS-15, AS-17, AS 18, AS-20 and AS-21 will be destroyed by overdrilling the casing and <br /> annulus to the total depth of each well using a combination of a sonic drilling rig and a hollow-stem auger <br /> drilling rig equipped 8-inch-diameter augers. Prior to the advancement of any rods or augers, the wells <br /> will be filled with cement with a tremie pipe. The wells will then be pressurized at approximately 20 to 40 <br /> pounds per square inch (psi) until the grout level stabilizes. This process will be repeated until the grout <br /> level stabilizes and each well is completely filled. A sonic drilling rig will then advance 2- or <br /> 4-inch-diameter rods down the center of the wells to the total depth of each well. Eight-inch-diameter <br /> hollow-stem augers will then be advanced around the sonic drilling rods ensuring that the augers stay <br /> centered on the well. These wells were installed using 8-inch-diameter augers, are constructed of <br /> 1-inch-diameter PVC casing, and range in depth between 71.5 and 110 feet. The sealing material will <br /> consist of neat cement. The cement will be introduced through the annulus of the augers with a tremie <br /> pipe, if required by the SJCEHD grout inspector, from the total depth of each boring to a depth of <br /> approximately 5 feet. The remaining 5 feet of annulus will be backfilled with either grout, sand, or native <br /> soil obtained from the overdrilling. The top approximately 6 inches of each boring will be backfilled with <br /> concrete and dyed black at the surface(as needed)to blend in with the surrounding asphalt. <br /> Project No.S9482-06-02 -2- January 5,2012 <br />
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