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ARCHIVED REPORTS_XR0007096
EnvironmentalHealth
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EHD Program Facility Records by Street Name
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88 (STATE ROUTE 88)
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14000
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3500 - Local Oversight Program
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PR0544811
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ARCHIVED REPORTS_XR0007096
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Entry Properties
Last modified
11/20/2024 9:21:18 AM
Creation date
9/5/2019 1:31:54 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0007096
RECORD_ID
PR0544811
PE
3528
FACILITY_ID
FA0000091
FACILITY_NAME
Colonial Energy CE 40138 (DBA Power Mart)
STREET_NUMBER
14000
Direction
E
STREET_NAME
STATE ROUTE 88
City
LOCKEFORD
Zip
95237
CURRENT_STATUS
02
SITE_LOCATION
14000 E HWY 88
P_LOCATION
99
P_DISTRICT
004
QC Status
Approved
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EHD - Public
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Site History <br /> 14000 Highway 68,Lockeford,CA <br /> Time Oil Property No.04-049 <br /> 2. Soil samples would be collected from each boring at 5-foot intervals and submitted for analyses <br /> based on visual observation and field instrumentation readings. A minimum of three samples <br /> would be submitted from each boring. <br /> 3. In the event that groundwater is encountered, the boring to be placed near W-8 would be <br /> installed as a 2-inch diameter groundwater monitoring well. If needed, up to three additional <br /> groundwater monitoring wells might be installed to assist in determining the extent of impacted <br /> groundwater. All wells would be properly developed and purged prior to the collection of <br /> groundwater samples. <br /> Additional Environmental Investigation - December 1994 <br /> While conducting field activities during the weeks of December 20 and 27, 1994, hydrocarbon-impacted <br /> groundwater was encountered while attempting to define the vertical extent of soil contamination. <br /> Therefore, four groundwater monitoring wells (MW-1 through MW-4) were installed and one soil boring <br /> (SB-11) was advanced in an attempt to define the extent of contamination in both media. <br /> As in previous site activities, soils encountered during drilling consisted of fine silty sands to <br /> approximately 15 feet below ground surface (bgs); this strata was underlain by fine to coarse sands to <br /> approximately 30 feet bgs. Clayey silt was generally encountered at 30 feet to 35 feet while fine to <br /> coarse sands and gravelly sands were encountered to 70 feet bgs. Silty clay with sandy and gravelly <br /> stringers was encountered from 70 feet bgs to the extent of each boring. Groundwater was first <br /> encountered at depth 85 feet bgs. <br /> MW-1 was installed to the northeast of the currently operating pump islands; MW-2 was installed to the <br /> �... east of MW-1; MW-3 was installed to the southeast of the farmer tank bed; and MW-4 was installed to <br /> the southwest of the former tank bed (presumably downgradient). Each of the wells was constructed of <br /> 2-inch diameter PVC and screened from a depth of 65 feet bgs to 100 feet bgs. Soil boring SB-11, <br /> placed to the west of the former tank bed, could only be advanced to a depth of 78 feet bgs due to <br /> difficult drilling conditions. <br /> Because the extent of shallow soil contamination was defined during earlier investigative activities, soil <br /> samples were collected only from depths of 25 feet and greater. Based on field instrumentation <br /> readings, four to five soil samples from each drilling location were submitted to a laboratory and <br /> analyzed for total petroleum hydrocarbons as gasoline (TPH) and also for benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX). Gasoline was found in the samples collected from MW-1 at 35 feet <br /> (3.4 ppm), 45 feet (680 ppm), 83 feet (3.2 ppm), and 100 feet (1.6 ppm); varying concentrations of BTEX <br /> were also found in these samples. Trace concentrations of benzene, ethylbenzene, and xylenes (none <br /> exceeding 0.01 ppm) were also found in the samples collected from MW-2 at 45 feet, 55 feet, and 60 <br /> feet, and in the sample collected from MW-5 at 71 feet. Hydrocarbons were not identified in any of the <br /> remaining samples. <br /> On January 19, 1995, the groundwater monitoring wells were purged and sampled. Prior to purging, <br /> measurements were collected from each well to evaluate groundwater elevation, flaw direction, and <br /> gradient. During field activities, groundwater with a southeasterly flow and a hydraulic gradient of 0.13 <br /> ft./ft. was encountered at 75.96 feet bgs to 86.80 feet bgs. <br /> Hydrocarbons were found in groundwater samples collected from each of the monitoring wells. The <br /> sample collected from MW-1 contained 5,200 ppb TPH, 200 ppb benzene, 1,100 ppb toluene, 160 ppb <br /> ethylbenzene, and 620 ppb xylenes. The sample collected from MW-2 was found to contain 460 ppb <br /> TPH, 30 ppb benzene, 48 ppb toluene, 5 ppb ethylbenzene, and 30 ppb xylenes. Analysis of the sample <br /> collected from MW-3 indicated 430 ppb TPH, 18 ppb benzene, 48 ppb toluene, 13 ppb ethylbenzene, <br /> 4 <br />
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