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Quik Stop Station No 39 September 23,2005 Stockton California Results ofAdditional Subsurface InvestijZation maintenance and eventual removal of this well Horizon obtained San Joaquin County Environmental Health Services well permit SR# 0040102 to install and construct wells MW- • 4 and MW-5, and well permit SR# 0040103 to install and construct off-site well MW-6 Copies of the well permit application forms are contained in Appendix A Mitchell Drilling Environmental of Eureka, California (license #C57-672617) was retained to perform hollow- stem auger drilling and monitoring well construction services Underground Service Alert was contacted to mark underground utility locations Fieldwork was conducted according to the Horizon Field Methods and Procedures contained in Appendix C On November 4 and 5 2004, monitoring wells MW-4 through MW-6 were drilled and installed at the locations shown on Figure 2 Depth to groundwater in monitoring wells MW-1 through MW-3 in November 2005 was approximately 54 feet bsg The well borings were advanced to 65 feet bsg utilizing drilling 8-inch diameter soil borings using hollow- stem auger equipment Soil descriptions, soil sampling and field screening data and well construction details were recorded on soil boring logs and are presented in Appendix D Soils were described using the Unified Soil Classification System Soil samples were collected from each well boring at 5-foot intervals starting at approximately 5 feet bsg for lithological logging purposes and for potential analyses where necessary to supplement site soil data Soil samples were field screened with a photo- ionization detector (PID) for the presence of volatile hydrocarbons Drill cuttings were stockpiled at the site on and covered with visqueen Four representative samples of the drill cuttings stockpile were collected for characterization and disposal purposes The monitoring wells were constricted with 2-inch inside diameter, polyvinyl chloride (PVC) casing and 0 020-inch slotted well screen set over the interval from 45 to 65 feet bsg Well construction was completed as shown on the monitoring well logs The well heads were fitted with locking caps and covered with flush-mounted, traffic-rated vault boxes The soil samples were submitted, under chain-of-custody (COC) documentation, to Kiff Analytical LLC (Kiff), a California state-certified laboratory (ELAP certification # 2236) 7039rpt9-05 Project No 7039 16 4 HORIZON ENVIRONMENTAL INC.