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Cone Penetrometer Assessment Report 6 Ranch Market,23569 South Santa Fe Road Riverbank,Cahforma November 20 2001 • Bonng I D Proposed Water Sample Depth Actual Water Sample Depth CPT-1 35 feet bgs Sampled at 40 feet bgs 50 feet bgs, 65 feet bgs No samples, refusal at 42 5 feet bgs CPT-2 35 feet bgs, 50 feet bgs, 65 feet bgs No samples, refusal at 40 feet bgs CPT-2A Bonng not proposed, drilled to Sampled at 35 feet bgs replace CPT-2 Refusal at 41 feet bgs CPT-3 35 feet bgs Sampled at 35 feet bgs The CPT soil borings were advanced using a direct push cone penetrometer testing ng to log soil stratigraphy Immediately adjacent to each CPT borehole, a second direct-push borehole was advanced to collect depth discrete grab groundwater samples from sand intervals defined by the CPT log (Attachment 5) Three water samples were collected from the borings in CPT- 1 at 40 feet bgs, in CPT-2A at 35 feet bgs, and in CPT-3 at 35 feet bgs Depth discrete grab groundwater samples were collected using a modified hydropunch sampler The sampler was driven to the desired depth and retracted 3 feet to expose the disposable schedule 20 PVC screen and allow groundwater to enter the hydropunch sampler The depth discrete water sample were collected by lowering a 3/a" diameter stainless steel bailer through the drive rods to groundwater The groundwater was bailed from the dnve rods, decanted from the bailer into 40-m1 VOA vials, and capped Each VOA vial was checked to insure no bubbles were present, labeled, placed on ice, and transported to the laboratory under chain-of-custody documentation The drive rods were retracted, leaving the disposable drive tip and 4 foot length of PVC well screen in the hole The drive rods and hydropunch sampler were steam cleaned, equipped with a new drive tip and PVC screen, and driven back into the borehole to the next sample depth The depth discrete water samples were labeled with the well number, placed in an insulated container on ice, and transported under standard chain-of-custody procedures to Kiff Analytical located in Davis, California The water samples were submitted for BTEX, TPHg,five oxygenates, and fuel additives 1,2-DCA and EDB analysis using EPA method 8260B All downhole drilling equipment was steam cleaned before drilling each borehole The down- hole sampling equipment was washed in a tri-sodium phosphate or AlconoxTM solution between each sampling effort The soil borings were tremie grouted back to grade using neat cement Domestic Water Wells Per the RWQCB request, SECOR attempted to monitor depth to bottom in domestic wells DW- 3 and DW-4 Permission was obtained from the two property owners prior to accessing each well However, the DW-3 property owners were not home the day the work was conducted and File Ranch Market\Reporls\Rb-CPT InstaU