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3500 - Local Oversight Program
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PR0545152
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SITE HISTORY
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Last modified
1/9/2020 3:06:42 PM
Creation date
1/9/2020 2:57:17 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
SITE HISTORY
RECORD_ID
PR0545152
PE
3526
FACILITY_ID
FA0004021
FACILITY_NAME
STOCKTON CITY TAXI CAB COMPANY
STREET_NUMBER
2085
Direction
E
STREET_NAME
FREMONT
STREET_TYPE
ST
City
STOCKTON
Zip
95205
APN
14111223
CURRENT_STATUS
02
SITE_LOCATION
2085 E FREMONT ST
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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EHD - Public
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W <br /> 1117 Lone Palm Avenue, Suite 201 <br /> Modesto, California -2225 <br /> V 209-579-22'r 1 <br /> Fax: 209-579-2225 <br /> ASSOSraTE S INC . <br /> Groundwater <br /> The shallow groundwater plume appears to be adequately defined in all directions except to the southf <br /> gasoline range organics (GRO), methyl tertiary butyl ether (MTBE), and 1,2-dicliloroethane ( 1 , 2-DCA) <br /> are frequently detected in groundwater samples collected from MW3 and MW9 . "These wells are located <br /> in the southern portion of the site . Monitoring wells MW I and MW8 continue to be the most impacted <br /> with respect to GRO and benzene, toluene, ethylbenzene, and xytenes (BTEX ) constituents; and IviW3 is <br /> the most impacted with respect to 1 ,2-DCA. The intermediate groundwater plume appears to be generally <br /> tlefrued to the northwest in the vicinity of NIW12 and MW4, but not well defined in other directions. <br /> Monitoring wells MW4 and NIW12 are slightly impacted , and MWS and MW6 continue to be the most <br /> impacted wells. The vertical extent of impacted groundwater appears to be less than 120 feet bgs. A <br /> summary of laboratory analytical results of groundwater samples collected by ATC is presented in Table <br /> 3 . The monitoring well locations are shown on Figure 3 . <br /> SCOPE OF WORK <br /> This Workplan has been prepared to conduct an ozone sparging pilot test. The pilot test data will be <br /> utilized to determine the feasibility of ozone sparging technology and to design a groundwater <br /> remediation system . The scope of work includes: modification as appropriate of the Health and Safety <br /> Plan on file with the S.ICEHD, installing two sparge wells, conducting an ozone pilot test, and <br /> preparation of a report summarizing the results of the proposed activities. The scope of work is described <br /> below, <br /> Permitting <br /> ATG will schedule field personnel and equipment, notify Underground Services- Alert to locate <br /> underground utilities as required , and perform other necessary field preparation and job start-up activities. <br /> A private utility locating service will also be used to locate underground utilities that may be present in <br /> the work areas. A drilling permit application will be completed and submitted to the SJCE.HD prior to <br /> initiation of trilling activities. <br /> Sparge Well Installation <br /> Two dual nested sparge wells are proposed for the pilot test. The borings for the sparge wells will be <br /> advanced using a hollow stem auger drilling rig equipped with 10- inch outside diameter (5%" or 6 '/ ' <br /> inside diameter) augers at the locations shown on Figure 4. These locations are in the vicinity of the <br /> former UST area and will allow for monitoring of potential hexavalent chromium downgradient of the <br /> testing area without going off site. Soil samples will be collected at five to ten foot intervals for lithologic <br /> logging purposes. Descriptions of soil types, lithologic features, blow counts, soil-groundwater interface <br /> and sample locations will be recorded on boring logs. Soil samples will be field screened for volatile <br /> organic vapors using a photoionization detector (PID). Selected soil samples collected during drilling <br /> (samples exhibiting the greatest PID reading and the sample directly above the water hearing unit) will be <br /> placed in a cooler with ice and delivered under chain-of-custody documentation to a State-certified <br /> analytical laboratory for analyses. <br /> Ozone Pilot Testing workpl:m — Pormer Stocklon Tnxi Company ATC Associates Inc. <br /> S:._\28349\ Reports\Ozate Pilot Testing, We ATC Project No. 5428349.0001 <br /> 4 <br />
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