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27 June 1996 AGE-NC Project No. 95-0118 Page 4 of 23 I 3.4. COLLECTION OF SOIL FOR MICROBIOLOGICAL/PHYSICOCHEMICAL ANALYSES On. 15 February 1996, a grab soil sample, from a depth of 15 feet bsg, was collected by a representative of AGE. The soil sample was collected in a metric soil sampler loaded with two pre- cleaned 2-inch by 3-inch brass sleeves. The ends of the lead sample sleeve were covered with Teflon sheets, capped and sealed with tape. The samples were stored under ice in a chilled container and transported to an independent microbiologist, Mr. A. Keith Kaufmann of Culver City, California, and analyzed for physicochemical properties and microbiological enumeration. 3.5. ANALYTICAL RESULTS OF SOIL SAMPLES A total of eight soil samples were submitted to MAI for analysU All samples analyzed were collected from depths of 15 to 50 feet bsg. TPH-g was detected in sample VW1-25 (former UST area) at 2;100 ppm; BTE&X were detected in the same sample at concentrations up to 0.95 ppm. jLow concentrations of TPH-g and BTE&X were also detected in the other samples submitted for analysis. Analytical results of the soil samples are summarized in Table 1 The laboratory report (MAI Laboratory I. D. Nos. 60827 through 60834) and chain-of-custody forms are included in Appendix B. The analytical results of soil samples submitted for physicochemical analysis and microbiological enumeration indicated low microbe viability at the site. The reported concentration of nitrogen, which is required for microbial growth and maintenance of bioremedial activities,was below optimal f. levels. The low total microbe populations encountered may be due to the lack of the necessary nutrients. Of the microbiological population present, a high proportion were hydrocarbon-degrading bacteria,probably the result of the presence of the hydrocarbons in the soil serving as a food source. The microbiological laboratory report(A.Keith Kaufman report dated February 26, 1996)and chain- of-custody hain- ofcustody form are included in Appendix C. 4.0. QUARTERLY GROUND WATER MONITORING, FEBRUARY 1996 I 4.1. GROUND WATER MONITORING PROCEDURES On 01 February 1996, the water level in each.well (MW-1 through MW-6) was measured relative to the top of the well casing using a Solinst water level meter (Table 2). After water levels were measured,approximately 5 to 6 gallons of water(a minimum of three well volumes)were evacuated from each well using a PVC bailer. Temperature,pH and conductivity were measured at one-gallon intervals using an ICM model 52200 water analyzer. Stabilization data and field logs are included in Appendix D. The purged water was stored on-site in 55-gallon drums.