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SITE-SPECIFIC HEALTH AND SAFETY PLAN FOR PHASE II ENVIRONMENTAL SITE ASSESSMENT
<br /> Site Background and Chemical Hazards
<br /> July 7, 2023
<br /> amyl methyl ether(TAME), di isopropyl ether(DIPE)tertiary butyl alcohol (TBA), 1,2-dichloroethane
<br /> (1,2-DCA), 1,2-dibromoethane (EDB), methanol and ethanol. None of the above mentioned fuel
<br /> components were detected by laboratory analysis.Analytical results of soil samples are summarized
<br /> in Tables 1 and 2. Results of the June 2000 investigation were reported in Quarterly Report - 2nd
<br /> Quarter 2000, dated 04 August 2000, prepared by AGE.
<br /> One soil sample(MW3-50)was submitted for microbial enumeration and physicochemical laboratory
<br /> analysis. The results of the analysis indicated that hydrocarbon-degrading microorganisms were
<br /> detected at 260,000 CFU (colony forming units) per gram. The laboratory indicated that these
<br /> physicochemical conditions at the site were well within the range necessary to support microbial
<br /> growth and bioremedial activity. Three soil samples (MW1-50, MW2-20 and MW2-35) were
<br /> submitted for laboratory analysis of permeability, porosity, moisture and total organic content.
<br /> Analysis of MW1-50 (silty clay/clayey silt) reported an average permeability of 8 x 10-7 , porosity at
<br /> 38.99 percent, moisture at 22.7 percent and organic content at 2.2 percent. Analysis of MW2-20
<br /> (sandy clayey silt/silty clay) reported an average permeability of 8 x 10-7, porosity at 48.65 percent,
<br /> moisture at 33.6 percent and organic content at 2.3 percent . Analysis of MW2-35 (sandy silt/silty
<br /> sand) reported an average permeability of 2 x 10-6, porosity at 43.15 percent, moisture at 25.6
<br /> percent and organic content at 1.6 percent.
<br /> • 27 November 2000-AGE conducted a sensitive receptor survey to locate potential vertical conduits
<br /> within a 2,000-foot radius of the site.The sensitive receptor survey located one operational municipal
<br /> water well(Station No.77)located approximately 300 feet south of the site, a second non-operational
<br /> municipal water well (Station No.3)located approximately 1,000 feet southeast of the site and a third
<br /> operational municipal water well (Station No. 21) located approximately 2,500 east of the site.
<br /> Results of the sensitive receptor survey are summarized in Table 5. Results of the investigation
<br /> were reported in Sensitive Receptor Survey, dated 27 November 2000, prepared by AGE.
<br /> • 09& 10 October 2003- Five soil borings(P-8 through P-12)were advancement at the site to depths
<br /> of 68 feet bsg. Soil borings P-8, P-10, P-11 and P-12 were advanced to depths of 50 feet bsg, while
<br /> boring P-9 was advanced to a depth of 65 feet bsg. Soil samples were collected at 5-foot intervals,
<br /> and a grab water sample was collected from P-9 at a depth between 65 and 68 feet bsg. Laboratory
<br /> analysis of soil samples detected TPH-mo at 5-feet bsg from borings P-8 and P-9 at concentrations
<br /> of 3.1 mg/kg and 3.8 mg/kg, respectively. TPH-g, TPH-d, toluene, ethylbenzene and xylenes were
<br /> not detected in the analyzed soil samples. However, benzene was detected at 15-feet bsg from
<br /> borings P-10 and P-12 at concentrations of 0.092 mg/kg and 0.21 mg/kg, respectively. The fuel
<br /> additive MTBE was detected at15-feet and 25 feet soil samples collected from borings P-10 and P-
<br /> 12 and the 25- foot soil sample collected from boring P-9 at concentrations as high as 0.14 mg/kg
<br /> (P12-15). Laboratory analysis of the P-9 grab water sample detected TPH-d and TPH-mo at
<br /> concentrations of 3,600 micrograms per liter (pg/1) and 17,000 pg/I, respectively. TPH-g was not
<br /> detected from the grab ground water sample analysis. BTEX compound benzene was detected at a
<br /> concentrations of 0.64 pg/l. BTEX compounds toluene, ethylbenzene and xylene were not detected
<br /> from the analysis. The fuel additive MTBE was detected at a concentration of 0.59 pg/l; 1,2-DCA
<br /> was detected at a concentration of 1.2 pg/l. Analytical results of soil and grab water samples are
<br /> summarized in Tables 1, 2 and 6. Results of the October 2003 investigation were reported in Site
<br /> Assessment Report- December 2003, dated 30 December 2003, prepared by AGE.
<br /> • 24 & 25 October 2005-Two ground water monitoring wells (MW-4 and MW-5)were installed at the
<br /> site to maximum depths of 70 feet bsg (Figure 2). A total of five soil samples were collected from
<br /> MW-5 and submitted for laboratory analysis of TPH-g, TPH-d, TPH- mo, BTEX, MTBE, ETBE,
<br /> TAME, DIPE, TBA, 1,2-DCA, EDB, methanol and ethanol. None of the above mentioned fuel
<br /> components were detected by laboratory analysis. Results of the October 2005 investigation were
<br /> reported in Monitoring Well Installation Report, dated 02 May 2006, prepared by AGE.
<br /> • 30 March 2006 - Immediately following installation of well MW-5, grout intrusion was suspected by
<br /> AGE due to significant pH values encountered during well development activities and due to a well
<br /> 5tantec
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