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ARCHIVED REPORTS XR0006116
EnvironmentalHealth
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2900 - Site Mitigation Program
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PR0542421
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ARCHIVED REPORTS XR0006116
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Last modified
6/21/2019 1:20:15 PM
Creation date
6/21/2019 10:44:51 AM
Metadata
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Template:
EHD - Public
ProgramCode
2900 - Site Mitigation Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0006116
RECORD_ID
PR0542421
PE
2950
FACILITY_ID
FA0024377
FACILITY_NAME
COUNTRY CLUB BLVD/295950
STREET_NUMBER
1876
STREET_NAME
COUNTRY CLUB
STREET_TYPE
BLVD
City
STOCKTON
Zip
95204
APN
12319101
CURRENT_STATUS
01
SITE_LOCATION
1876 COUNTRY CLUB BLVD
P_LOCATION
01
QC Status
Approved
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EHD - Public
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surface (bgs) An aquitard consisting of silty clay approximately 3 to 4 feet thick <br /> separates the silty clayey sand A zone aquifer from the B zone aquifer that is found at <br /> approximately 21 feet bgs and is approximately 6 to 7 feet thick In newly installed wells <br /> MW9A/B this aquitard has drastically thinned to a one foot thickness The B zone <br /> aquifer consists of cleaner moderately sorted fine to coarse sand that shows graded <br /> bedding (fine to coarse with depth) Beneath the B zone aquifer is stiff clay that extends <br /> from approximately 27 feet bgs to 40 feet bgs The original five monitor wells did not <br /> encounter groundwater in the A zone aquifer when initially drilled and sampled Depth <br /> to water measurements taken between 1993 and February 1996 indicate that the A zone <br /> aquifer was dry (depth to water greater than 17 feet bgs) MW 1 through MW5 are <br /> screened across both the A and B zone aquifers Sometime after February 1996 depth to <br /> groundwater measurements indicated that groundwater was in contact with the A zone <br /> aquifer, see Table 1 <br /> The groundwater in the vicinity of the site is semiconfined Groundwater elevation at the <br /> site varies from a wet year high of 7 feet bgs (silty clay formation above the A zone) to <br /> about 22 - 23 feet bgs (B zone) during the previous drought period Groundwater flow <br /> direction in the A zone at the site has generally been to the west since December 1997 <br /> The B zone shows a similar flow direction, which would be expected due to the <br /> connection between zones at wells MW1 through MW5 <br /> 3RD QUARTER 2005 SITE ACTIVITIES <br /> . GROUNDWATER PUMP AND TREATMENT SYSTEM <br /> The treatment system consists of five activated water carbon units (55 gallon drums), a <br /> aeration tank with recirculating pump positioned between carbon units 42 and 43, a <br /> temporary 22,000 gallon Baker tank with high level shut off float switch and discharge <br /> pump after carbon unit #5 and the discharge drum, positioned on a plastic drum <br /> containment platform (secondary containment) A high pressure sensor placed at the <br /> influent of the 91 carbon unit is set to turn the well pump off if pressures of 12 psi or <br /> greater are indicated A high level float switch in the aeration tank will shut off the well <br /> pump A low level fluid swatch in the aeration tank shuts off the recirculating pump A <br /> high level float swatch in the Balser tank shuts off the recirculating pump in the aeration <br /> tank A high level float swatch and an LEL sensor positioned in the discharge drum will <br /> also shut off the well pump if the LEL reaches 10% or the high water level swatch is <br /> activated In all cases the system will not restart until a visual inspection has been <br /> achieved and the system has been manually reset The LEL readings are continuously <br /> recorded on a 7 day chart and the discharge is noted with a water totalizing meter Site <br /> visits are conducted on a weekly basis to change out the LEL chart and monitor the pump <br /> and treatment system <br /> TREATMENT SYSTEM OPERATION <br /> March 31, 2005 Start groundwater pumping and treatment Obtain samples, <br /> effluent of pump (influent of carbon unit #1) and effluent of <br /> 4 Sanchez QM P 2005 <br />
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