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ARCHIVED REPORTS_XR0005377
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0545520
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ARCHIVED REPORTS_XR0005377
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Last modified
3/13/2020 2:41:25 AM
Creation date
3/12/2020 11:16:13 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0005377
RECORD_ID
PR0545520
PE
3528
FACILITY_ID
FA0006186
FACILITY_NAME
U S RENTALS
STREET_NUMBER
1444
Direction
E
STREET_NAME
MARIPOSA
STREET_TYPE
RD
City
STOCKTON
Zip
95205
CURRENT_STATUS
02
SITE_LOCATION
1444 E MARIPOSA RD
P_LOCATION
01
P_DISTRICT
001
QC Status
Approved
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SJGOV\sballwahn
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EHD - Public
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i <br /> 1444 MARIPOSA ROAD <br /> WKA No 2938.07 <br /> • January 18,2001 <br /> Page 6 <br /> i <br /> Based on results of quarterly groundwater samples obtained since 1993, the contaminated plume <br /> appears relatively small and largely limited to the boundaries of the property. Additionally, <br /> because the plume does not appear to be expanding or undergoing any obvious migration, some <br /> degree of natural attenuation and or bioremediation is most likely occurring beneath the site. <br /> These natural processes along with the relatively flat calculated groundwater gradients provides a <br /> high level of assurance that possible sensitive receptors in the form of offsite wells will likely not <br /> be impacted by contaminated groundwater beneath the site. Finally,the fact that the former <br /> leaky underground fuel storage tanks have been removed and a vast majority of the contaminated <br /> soil has been excavated and aerated on site provides further protection for any nearby potential <br /> sensitive receptors <br /> A summary of the groundwater elevations is provided in Table 1. Results of laboratory analysis <br /> for water samples are included in Tables 2 and 3 Copies of the analytical reports and chain-of- <br /> custody <br /> hain-ofcustody documentation are appended. <br /> Based on past site investigative activities and results of laboratory analysis, it is our opinion that <br /> the site has met the criteria for classification as a"low risk groundwater case" as defined by the <br /> CVRWQCB As a result, we recommend that SJCPHD require no further action as related to the <br /> underground storage tanks at this site and that the CVRWQCB be notified of our findings Upon <br /> concurrence for site closure by the SJCPHS and the CVRWQCB,we recommend that the <br /> monitoring wells be abandoned in accordance with County and State regulations and purged <br /> groundwater currently stored be removed from the site. <br /> Wallace-Kuhl&Associates, Inc. <br /> ��;� PURI ''•��.+ <br /> OL <br /> BxUI <br /> r � • <br /> •r•srrwNa`*�•r <br /> atthew Taylor urt Balasek <br /> Senior Environmental Technician Senior Hydrogeologist R.G., CH <br /> Copy to- Mr.Dan Sweeney;United Rentals, Inc. <br /> MT:KB:sdm <br /> MOW ROF <br /> �t XI <br /> w T` / <br />
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