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ARCHIVED REPORTS XR0010246
EnvironmentalHealth
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3500 - Local Oversight Program
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PR0544799
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ARCHIVED REPORTS XR0010246
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Last modified
11/19/2024 10:19:06 AM
Creation date
9/3/2019 3:32:36 PM
Metadata
Fields
Template:
EHD - Public
ProgramCode
3500 - Local Oversight Program
File Section
ARCHIVED REPORTS
FileName_PostFix
XR0010246
RECORD_ID
PR0544799
PE
3528
FACILITY_ID
FA0003872
FACILITY_NAME
DISCOVERY CHEVROLET
STREET_NUMBER
1615
Direction
W
STREET_NAME
ELEVENTH
STREET_TYPE
ST
City
TRACY
Zip
95376
APN
23227019
CURRENT_STATUS
02
SITE_LOCATION
1615 W ELEVENTH ST
P_LOCATION
03
P_DISTRICT
005
QC Status
Approved
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EHD - Public
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i <br /> Second Quarter 1996 Status Report <br /> June 7, 1996 <br /> .Quarterly monitoring and sampling of. the monitoring wells began in March 1995. <br /> Historically, depth to groundwater has fluctuated between 9.86 and 11.53 feet bgs. <br /> Groundwater flow has been consistently toward the north-northwest at a shallow gradient. <br /> Floating product has not been observed in the monitoring wells. TPHg, BTEX, or Oil and <br /> Grease have not been detected in well.MW-3. TPHg concentrations in wells MW-1 and <br /> MW-2 have ranged from 60 to 17,000 ppb, and benzene concentrations have ranged from <br /> 10 to 3,100 ppb. Analysis of samples from well Mw-3 for Oil and Grease was discontinued <br /> after the fourth Quarter 1995. Historical quarterly groundwater monitoring and chemical <br /> analytical data are summarized in Table 1. <br /> PRESENT QUARTER FIELD ACTIVITIES <br /> Quarterly monitoring and sampling of the groundwater monitoring wells for the second <br /> quarter 1996 was performed by G-R on May 13, 1996. Field monitoring and chemical. <br /> analytical data from the current quarter are summarized in Table 1. The GR groundwater <br /> sampling procedures are summarized in Appendix A. Copies of the G-R field data sheets <br /> are presented in Appendix. B. Copies of the laboratory analytical report and completed <br /> chain-of-custody form are presented in Appendix C. <br /> Groundwater Monitoring and Gradient Evaluation <br /> Depth-to-water (DTW) measurements were obtained by G-R. from groundwater monitoring <br /> wells MW-1 through MW-3 prior to well purging and sample collection. Static groundwater <br /> levels were measured from the north edge of the top of each well casing and recorded to the <br /> nearest ±0.01 foot. Groundwater was measured between 9.94 and 10.51 feet bgs. These <br /> water-level data were used to construct a Potentiometric Map (Figure 3). Based on these <br /> data, the shallow groundwater beneath the subject site appears to flow toward the northwest <br /> at a gradient of approximately 0.002. Each well was inspected for the presence of floating. <br /> product. Floating product or a product sheen was not observed in any of the groundwater <br /> monitoring wells this quarter. <br /> Laboratory Analytical Data <br /> The groundwater samples were collected in sample containers supplied by the laboratory. <br /> The samples from wells MW-1 through MW-3 were analyzed for TPHg by Environmental <br /> Protection Agency (EPA).Method 50301GC-FID, and for benzene, toluene, ethylbenzene, <br /> and. total xylenes (BTEX) by EPA Method 8020. The sample from well MW-3 was also <br /> analyzed for TPHd by EPA Method 5030/GC-FID, and chlorinated hydrocarbons (CI-HCs) <br /> by EPA Method 8010. The.samples were analyzed by American Environmental Network <br /> (ELAP #1172) located in Pleasant Hill, California. <br /> i <br /> 9144.03-2 3 <br />
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