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ARCHIVED REPORTS_XR0003965
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0545394
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ARCHIVED REPORTS_XR0003965
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Last modified
3/5/2020 2:55:36 PM
Creation date
3/5/2020 2:07:00 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0003965
RECORD_ID
PR0545394
PE
3528
FACILITY_ID
FA0005372
FACILITY_NAME
MAR-VAL MARKET*
STREET_NUMBER
429
Direction
W
STREET_NAME
LOCKEFORD
STREET_TYPE
ST
City
LODI
Zip
95240
CURRENT_STATUS
02
SITE_LOCATION
429 W LOCKEFORD ST
P_LOCATION
02
P_DISTRICT
004
QC Status
Approved
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SJGOV\sballwahn
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EHD - Public
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In May 1991, SEACOR advanced four soil borings in the vicinity of the former USTs to further evaluate <br /> the lateral and vertical extent of fuel hydrocarbons in subsurface soil. Chemical testing results for soil <br /> samples collected from these borings indicated that gasoline released from the USTs had apparently <br /> migrated vertically to a depth of approximately 35 to 40 feet bgs. The highest concentration of TPHg <br /> detected was 5,100 ppm at a depth of 19 feet bgs. Soil sample results also indicated that significant <br /> lateral migration of gasoline had not occurred. <br /> One of the soil borings (MW-IA) located within the former UST excavation was subsequently converted <br /> to a groundwater monitoring well. Initial groundwater sample results revealed the presence of TPHg at <br /> a concentration of 1 ppm and BTEX concentrations up to 130 parts per billion (ppb). SEACOR has <br /> collected and chemically analyzed groundwater samples from well MW-IA on a quarterly basis since May <br /> 1991. TPHg and BTEX concentrations reported in groundwater samples collected from well MW-lA <br /> consistently decreased during each subsequent quarter, and TPHg has not been detected above the <br /> laboratory reporting limit during the last four consecutive sampling events (May 1992 to June 1993). <br /> ' With the exception of trace levels (less than 1 ppb) of xylenes and toluene, BTEX has not been detected <br /> in this well during the last six sampling events (February 1992 to June 1993). <br /> In January 1993, SEACOR installed two additional monitoring wells (MW-2 and MW-3) at the locations <br /> shown on Figure 2. These wells were installed at the request of the SJCPHS to monitor groundwater <br /> quality in the downgradient direction from the former USTs. Groundwater samples collected from these <br /> two wells in March and June 1993 were reported to contain no detectable concentrations of TPHg and <br /> BTEX. <br /> In November 1991, SEACOR installed a vapor extraction well (EW-1)approximately 5 feet from existing <br /> monitoring well MW-lA (see Figure 3). In early April 1992, SEACOR installed a soil vapor extraction <br /> system at the Site. The system consisted of vapor extraction well EW-1, a trailer-mounted regenerative <br /> ' blower with a 200 cubic feet per minute (CFM) capacity, and two in-line granular activated carbon <br /> (GAC) vapor phase treatment vessels (2,000 pound and 200 pound capacity). The vapor extraction and <br /> treatment equipment are all housed within a paved and fenced compound. <br /> 1 SEACOR began operating the soil vapor extraction system on April 15, 1992. By January 1993, influent <br /> vapor stream concentrations decreased to below 50 ppm total hydrocarbons (methane equivalent) and an <br /> estimated 1,070 pounds of gasoline had been removed from the subsurface soils through vapor extraction. <br /> In January 1993, SEACOR advanced a single confirmatory soil boring (CSB-1) at the location shown on <br /> Figure 3. The boring was located within 5 feet from boring MW-1, where TPHg concentrations up to <br /> 5,100 ppm had previously been detected in soil. T'he confirmatory boring was advanced to 46.5 feet bgs. <br /> During borehole advancement, soil samples were collected at 5-foot depth intervals and subsequently <br /> analyzed for TPHg and BTEX. <br /> ' With the exception of a single soil sample collected from 30 feet, soil samples contained no detectable <br /> TPHg concentrations (1 ppm detection). A TPHg concentration of 1 ppm was reported in the sample <br /> collected from a depth of 30 feet. The laboratory reported the chromatogram pattern for this sample was <br /> ' a non-standard gasoline pattern, possibly the result of degradation of the gasoline via processes such as <br /> biodegradation and volatilization induced by vapor extraction. <br /> Benzene, toluene, and ethylbenzene were not detected above the laboratory reporting limit of 0.003 ppm <br /> in soil samples collected from confirmatory soil boring CSB-1. Total xylenes were reported to be present <br /> CONFIRMAK <br /> 50014-005-01 3 <br />
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