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S E C O R 7-Eleven Store#14117 Field Test for Evaluation of Oxidation Capacity of Groundwater July 22, 2004 Page 4 field work The Site-Specific Health and Safety Plan will be reviewed by the field staff and contractors before beginning field operations at the site Permitting and Utility Location The permits for the groundwater monitoring well installations will be obtained from the San Joaquin County Environmental Health Department (SJCEHD) SECOR will contact Underground Service Alert at least 48 hours prior to beginning drilling A private utility locator will also be used to identify the location of undergrounds utilities in the area surrounding the proposed well locations in addition, the boring locations will be hand- cleared to 5 feet bgs prior to beginning drilling activities Soil Borings SECOR will supervise the drilling and installation of the oxygen injection well at the location shown on Figure 3 The well will be drilled to a depth of approximately 25 feet bgs using a truck-mounted drilling rig equipped with 8-inch-diameter hollow-stem augers Sod samples will be collected at five foot intervals using a split spoon sampler lined with 2-inch diameter by 6-inch-long brass sample tubes The sod samples will be logged to Insure correct placement of the screened intervals A consistent sand layer underlies most of the site at depths of approximately 20 feet bgs as shown in the boring logs (Attachment A) This sand layer appears to be the most permeable zone underlying the subject site, and should prove to be the most effective zone for oxygen injection Downhole drilling equipment will be steam cleaned before drilling, and sampling equipment will be cleaned between each sampling interval Each soil sample will be screened for hydrocarbon vapors using a portable photo-ionization detector (PID) Sods encountered during drilling will be logged using the Unified Soil Classification System by a SECOR field geologist, working under the supervision of a California Registered Geologist All soil samples collected will be sealed with Teflon sheets and plastic caps then labeled and placed on ice in an insulated container Soil samples will be retained in refrigerated storage for possible analysis at a later date Well Installation The oxygen injection well will be completed with two-inch diameter Schedule 40 poly-vinyl chloride (PVC) casing, and will be screened from approximately 20 to 25 feet The injection well will have a sand filter pack placed within the annulus of the well from the bottom of the boring to approximately one foot above the top of the well screen The annulus of the well will be sealed with two feet of bentonite on top of the sand that will be capped with a Portland cement/bentonite grout to the surface The well will be secured at grade with an 8- inch-diameter traffic-rated street box and sealed with a locking expansion cap Well Development Following installation, the oxygen injection well will be developed by surging and bailing using a surge block and bailer to remove fine-grained sediments from each well and sand 14117 Field Test Oxidation Capacity doc SECOR International Incorporated