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A S S O C I A T E S I N C bgs, borings V W I, V W2, and V W3 were advanced to approximately 65 5 feet bgs, and borings MW9 and MW10 were advanced to approximately 81 feet bgs Soil boring ASI was completed as a 4-inch diameter air sparge well with two one-inch diameter piezometers located in the same borehole Soil borings PZla and PZ1b were completed as 1-inch diameter piezometer pairs Soil borings VWi, VW2, and VW3 were completed as a 2-inch diameter vapor extraction wells ' and soil borings MW9 and MW 10 were completed as a 2-inch diameter groundwater monitoring wells Soil samples were collected from each soil boring at approximate ten-foot intervals, with the exception of soil borings MW9 and MW10, in which soil samples were collected at five-foot intervals The soil samples were collected using a 2-inch diameter split-spoon sampler containing three brass tubes A field geologist logged drill cuttings and soil samples utilizing the Unified Soil Classification System Descriptions of soil types encountered and sample collection intervals are included on the soil boring/well construction logs contained in Appendix A Drill cuttings were temporarily stored on site on visquene plastic ' 2.2 Sampling and Analysis The cored samples and drill cuttings were characterized for soil type, moisture content, and p visual evidence of petroleum hydrocarbons Each soil sample was field screened with a FID for the presence of volatile organic compounds Sample tubes were then sealed at each end using Teflon tape and plastic end caps, labeled, and placed on ice Selected soil were samples kept on ice and delivered under chain-of-custody documentation to p p Argon Laboratories in Ceres, California for chemical analysis Soil samples were analyzed for TPHg by EPA method 8015, BTEX by EPA method 8020, and MTBE, TAME, ETBE, DIPE, TBA, 1,2-DCA, and EDB by EPA method 8260 The analytical results for soil samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are included ' in Appendix B ' 2.3 Groundwater Monitoring Well Construction J `► �`' /P e„ sot W k e n �CFr' The piezometers were numbered for identification purposes using the following rational The piezometers within the DD6well annulus were identified with the respective DDC well number followed by "s” for shallow, or "d" for deep The piezometer pairs installed around each DDC well were identified with a PZ designation, followed by the number 1 if associated with well ' AS 1 The letter "a" or "b" following the number identifies the specific piezometer pair An "s" or "d" was used to differentiate between the shallow and deep piezometer within the pair Monitor wells were identified by a MW designation For example, ASld identifies the deep piezometer within the well casing of AS 1, PZ 1 b(s) identifies the shallow piezometer within the second piezometer pair associated with AS 1 w 1163931reportslrnfs doe 4