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Former Beacon Station No 12474 June 7,2005 Stockton California Results of Additional Groundwater Assessment Underground Service Alert (USA) was notified to locate and mark underground utilities adjacent to the site From February 2 to 12, 2004, Horizon conducted drilling and installation of five monitoring wells (MW-13 through MW-17) at the locations shown on Figure 2 Soil descriptions, soil sampling and field screening data and well construction details were recorded on soil boring logs Soils were described using the Unified Soil Classification System Soil samples were collected from each well boring at selected intervals as follows • 12 soil samples from MW-13 between 91 and 150 feet bsg • 4 soil samples from MW-14 between 91 and 136 feet bsg • 5 soil samples from MW-15 between 92 and 147 feet bsg • 28 soil samples from MW-16 between 6 and 142 feet • 4 soil samples from MW-17 between 93 and 137 feet bsg All soil samples were field screened using a photo-ionization detector (PID) Three samples • from each well boring covering the interval from 91 feet to total depth were submitted for analyses Drill cuttings were stockpiled at the site on and covered by plastic sheet After completion of drilling, four discrete soil samples were collected from the drill cuttings stockpile for disposal characterization The monitoring wells were constructed utilizing 2-inch ID PVC well casing and 0 020-inch slotted well screen Five-foot long monitoring-well screens were set at variable depths, generally between 130 and 150 feet bsg, on the basis of stratigraphic data obtained from previously advanced CPT borings CPT-1, CPT-2 and CPT-3 The CPT logs and monitoring well logs are contained in Appendix C The soil samples were submitted, under chain-of-custody documentation, to Kiff Analytical LLC (Kiff), a California Department of Health Services-certified (ELAP No 2236) analytical laboratory Iocated in Davis, California Fourteen soil samples were analyzed for total . petroleum hydrocarbons as gasoline (TPHg), the volatile aromatic compounds benzene, AddtnJGWassmnt Project No 1474 15 4 HORIZON ENVIRONMENTAL INC.