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were collected and analyzed. Site activities were summarized in JPCAs 2nd Phase H Environmental Assessment Report, dated October 25, 2000. ' In January 2003 GHH Engineering, Inc. (GHH) advanced three cone penetrometer borings and three soil borings to depths ranging from 104 feet bgs to 122 feet bgs. ' In May 2003, GHH advanced four soil borings, MW6a, MW6b, MW7a, and MW7b to the east of ' the site. These borings were completed as well clusters with MW6a and MW7a advanced to a depth of approximately 75 feet bgs, and MW6b and MW7b advanced to a depth of approximately 94 feet bgs. GHH also installed extraction well EWl in the southeast portion of the site. Site activities were summarized in GHH's Second Quarter 2003 Groundwater Monitoring Report and Additional Assessment Report, dated June 2003. ' 4.0 SPARGEPOINTR INSTALLATION ACTIVITIES All work was completed in general accordance with GHH's Interim Groundwater Treatment ' System, Jamar Service, 4075 East Main, Stockton, California, dated October 2003. The SJCEHD approved this workplan in correspondence dated November 7, 2003 with minor comments. 4.1 Hollow Stem Auger Drilling Activities ' On January 14, 15, 16, 19, and 21, 2004, an ATC geologist supervised the advancement of five soil borings (IW1 through IW5) to depths of approximately 110 to 111.5 feet bgs. Woodward Drilling, California License C57 710079, advanced the borings utilizing a hollow stem auger drill rig. Soil samples were collected from the borings at five-foot intervals in stainless steel sampling tubes. The samples and drill cuttings were characterized for soil type, moisture content, and visual evidence of petroleum hydrocarbons. A photoionization detector (FID) was used as a field- screening device for the detection of petroleum hydrocarbon vapors in drill cuttings and samples. 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 well construction logs contained in Appendix A. Two injection SpargepointsR (for example IW 1 s and IW 1 d in IW 1) were then installed into each soil boring. IWls, IW2s, IW3s, IW4s, and IW5s were completed as shallow SpargepointsR and ' --_-=IWld, IW2d,IW3d, IW4d, and IW5d were completed as deep SpargepointsR. = -= Drill cuttings were temporarily stored on site in steel ten-yard roll-off bins. A site plan with the nested remediation injection well locations is shown on Figure 2. ' w:lwordpr"\26121,reporls\,crosysinsl,d,,c 2