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i 1 ' Ms Margaret Lagono • Page 3 of 8 1 Discrete groundwater samples were collected from boring CB5 within strata identified from CPT data t using a Simulprobe° sampling tool Samples were collected at the depths of 74, 88, 112 and 140 feet The samples were collected into pre-cooled 40-mL vials with hydrochloric acid preservative, sealed, labeled, and immediately placed in an iced cooler for transport and submittal to Argon under chain of ' custody protocol Soil and groundwater samples were analyzed for TPHg, BTEX, gasoline oxygenate additives, DCA, ' EDB, methanol and ethanol Borings CB2, CB3 and CB4 ' On February 21, 2001 through February 22, 2001, Precision utilized a hollow stem auger ng to advance borings CB2 through CB4 in order to collect discrete soil samples for remedial efficiency and confirmation concerns Soil samples were collected from the hollow stem auger bonngs at pre- determined depths based on analytical data from prior site investigations The samples were collected by using an 18-inch long core sampler lined with new 2 '/z-inch diameter brass sleeves, affording soil identification, subjective evaluation for contamination and screening for volatile constituents with a ' PID Soil samples collected for analysis were sealed, labeled, and immediately placed in an iced cooler for transport and submittal under chain of custody protocol to Argon Analysis consisted of TPHg, BTEX, gasoline oxygenate additives,DCA,EDB methanol and ethanol Soil boring logs are included in ' Attachment A Well Drilling and Installation On February 27, 2001, Spectrum Exploration (C57 512268) used a hollow stem auger rig to advance boring MW 14 for subsequent conversion into a groundwater monitoring well Soil samples were ' collected at 5-foot intervals using an 18-inch long core sampler lined with new 2-inch diameter brass sleeves, affording soil identification, subjective evaluation for contamination and screening for volatile constituents with a PID Samples collected were sealed, labeled, and immediately placed in an iced t cooler and transported to Argon under chain of custody protocol Soil samples selected for analysis were based on field observations and field screening results Analysis consisted of TPHg, BTEX, gasoline oxygenate additives, 1,2 DCA,EDB,methanol and ethanol i ' Based on the lithology and initial depth to groundwater observed during drilling, well MW 14 was screened from 30 to 55 feet bgs The well was constructed of 2-inch diameter, Schedule 40 PVC casing and 0 020 ' inch slotted screen The filter pack consisted of#3 silica sand The annular seal consists of 2 feet of bentonite overlain by neat cement grout The location of monrtonng well MW 14 is shown on Figure 2 The boring/well construction log is included in Attachment A Well Development and Groundwater Sampling ' On March 6 2000,the water level in MW 14 was monitored and the well was developed and sampled The groundwater surface was measured at 37 88 feet below grade The casing elevation was subsequently surveyed and tied to the existing wells Groundwater gradient on March 6, incorporating well MW 14 is ' depicted on Figure 3 ' Rorklcloarelcmfbtrrp,doc