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Chevron Products Company 5
<br />Former Chevron Station 9-5775, 301 W Kettleman Lane, Lodi, CA July 24,2000
<br />rSoil Sampling and Analysis
<br />U
<br />Soil samples selected for logging and analysis were collected at 5 -foot intervals using a
<br />California -modified split -spoon sampler Capillary fringe samples (collected at approximately
<br />55 feet bgs) were selected for analysis from monitoring wells MW -513, MW -813, MW -I OA and
<br />B, MW I IA and B, MW -12A and B, MW -13, and MW -14 In addition, samples collected at 90
<br />feet bgs were submitted for analysis to monitoring wells MW -513, MW -813, and MW -i 1 B and
<br />at 65 feet bgs in monitoring well MW -14
<br />Hydrocarbons and fuel oxygenates were not reported in soil samples collected from monitoring
<br />wells MW -513, MW -813, MW -1 OA and B, MW 11A and B, MW -12A and B, and MW -13
<br />MtBE was reported at a concentration of 0 189 mg/kg in the sample collected from 65 feet bgs
<br />in monitoring well MW -14 Table 2 presents the soil analytical results Analytical data sheets
<br />for soil samples are included in Attachment E
<br />Groundwater Monitoring Well Development, Sampling, Analysis and Surveying
<br />On June 23, 2000, the newly constructed monitoring wells were developed and sampled by a
<br />SECOR environmental technician Field and laboratory procedures are included as Attachment
<br />F Depth to groundwater varies between 55 to 57 feet bgs in shallow wells screened from 55 to
<br />65 feet bgs and between 56 to 59 feet bgs in deeper wells screened from 85 to 90 feet bgs The
<br />shallow water -bearing zone, as monitored by monitoring wells MW -1 through MW -5A, MW -6
<br />through MW -8A, MW -9, MW- IOA, MW -I IA, MW -12A, MW -13, and MW -14, has an
<br />approximate gradient of 0 005 with a flow direction to the west The deeper water -bearing
<br />zone, as monitored by monitoring wells MW -513, MW -813, MW- IOB, MW -1 IB, and MW -12B,
<br />has an approximate gradient of 0 003 with a flow direction to the southwest
<br />TPHg and benzene, toluene, ethyl -benzene, and xylenes (BTEX compounds) were not detected
<br />in groundwater samples collected from monitoring wells MW -513, MW -813, MW -1 OA and B,
<br />MW -11A and B, MW -12A and B and, MW -13 (Table 3) Benzene was detected in monitoring
<br />well MW -14 at a reported concentration of 102 ug/l MtBE was detected in monitoring wells
<br />MW -513, MW- 1OB, and MW -14 at reported concentrations of 160, 5 2, and 1,100 ug/1,
<br />respectively ETBE was detected in monitoring wells MW -513 and MW -14 at concentrations
<br />of 14 and 120 ug/l, respectively Ethanol was detected in monitoring wells MW -10B and MW -
<br />12B at reported concentrations of 1,400 and 2,000 ug/l, respectively Analytical data sheets for
<br />groundwater samples are included in Attachment G Groundwater isoconcentration maps are
<br />presented as Figures 6, 7, and 8
<br />All newly installed wells were surveyed relative to mean sea level by Baumbach & Piazza (a
<br />California licensed surveyor) Attachment H contains a letter from the surveyor, dated July 14
<br />2000, which details the elevations of the newly installed wells
<br />077 41991 043/9-5775PAR doc
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