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ARCHIVED REPORTS XR0011906
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544802
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ARCHIVED REPORTS XR0011906
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Last modified
11/19/2024 10:19:09 AM
Creation date
9/4/2019 11:56:52 AM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0011906
RECORD_ID
PR0544802
PE
3528
FACILITY_ID
FA0005153
FACILITY_NAME
FAYETTE MANUFACTURING CORP
STREET_NUMBER
7675
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
25014012
CURRENT_STATUS
02
SITE_LOCATION
7675 W ELEVENTH ST
P_LOCATION
99
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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`W <br /> wells, soil samples were collected in the borings. On July 21, 1995 Smith Environmental <br /> developed and sampled monitoring wells MW-1, MW-2 and MW-3. Analytical results of the soil <br /> and groundwater samples collected indicated elevated concentrations of petroleum hydrocarbons <br /> were present in the soil and groundwater downgradient of the former gasoline UST locations. <br /> GROUNDWATER SAMPLING AND GRADIENT EVALUATION <br /> Smith Environmental personnel performed the latest quarterly groundwater monitoring of <br /> monitoring wells on October 23, 1995. Field work consisted of measuring depth-to-water <br /> (DTW) levels in all wells and collecting groundwater samples from all wells and submitting <br /> groundwater samples for laboratory analysis. <br /> Water level measurements were collected from wells MW-1, MW-2, and MW-3. The depth to <br /> water ranged from 7.50 to 8.99 feet below top of well casing elevation. Groundwater elevations <br /> have decreased an average of 1.18 feet since July 21, 1995. The water level data were used to <br /> develop the groundwater elevation contour map (Figure 3). Assuming that horizontal isotropic <br /> conditions prevail, groundwater in the uppermost aquifer beneath the site flowed in a <br /> northwesterly direction. The average hydraulic gradient on October 23, 1995 was calculated to <br /> be 0.004 ft/ft or about 21 feet/mile. The data indicates a groundwater gradient that is consistent <br /> with the gradient last quarter. A summary of groundwater monitoring data is presented in Table <br /> 1. Groundwater elevations are referenced to feet mean sea level. <br /> Groundwater samples were collected from three shallow groundwater monitoring wells, MW-1, <br /> MW-2, and MW-3. Prior to collection of groundwater samples a minimum of three well casing <br /> volumes were purged. The depth-to-water, pH, electrical conductivity, and temperature were <br /> measured and allowed to stabilize before groundwater samples were collected. Samples were <br /> then collected from each well using disposable bailers. Purge water was contained in 55 gallon <br /> DOT approved drums. Purge water from monitoring well MW-1 from the previous sampling <br /> event did not contain detectable concentrations of petroleum hydrocarbons and was discharged to <br /> the ground surface. <br /> The groundwater samples collected from each well were submitted with Chain of Custody Record <br /> to Argon Laboratories of Ceres, California, a State Certified laboratory (DOHS #1873). Samples <br /> were analyzed for total petroleum hydrocarbons as gasoline (TPHg), and benzene, toluene, <br /> ethylbenzene, and total xylenes (BTEX) utilizing EPA methods 8015/8020. <br /> Groundwater well purge and sample logs are provided in Attachment A. <br /> RESULTS OF LABORATORY ANALYSES <br /> Water samples collected from each well were analyzed for TPHg, and BTEX using modified EPA <br /> methods 8015/8020. These results and cumulative results of laboratory analyses are summarized <br /> in Table 2. The Chain of Custody Record, laboratory analytical reports, and chromatograms are <br /> included in Attachment B. <br /> w:\95122\4QMR1995.doc <br /> • <br /> SKTH <br />
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