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I Gregg In Situ, Inc. SECOR January 14, 1998 SFFS, Stockton, CA A complete set of baseline readings was taken prior to each sounding to determine temperature shifts and any zero load offsets. Monitoring base line readings ensures that the cone electronics are operating properly. The cones were pushed using GREGG 1N SITU's CPT rig, having a down pressure ' capacity of approximately 25 tons. , Three (3) CPT soundings were performed. The penetration tests were carried to depths of between 115 feet and 125 feet below ground surface. Test locations and depths were determined in the field by SECOR personnel (Table 1). Table 1 Summary and Cone Test Data and Sampling f Test Location De th of Sound (ft) Samp ' De th CPT-01 125.00 GW @ 85 ft GW Q 108 ft GW ( 125ft SS @ 125 ft CPT-02 115.16 GW @ 34 ft GW@84ft GW @ 104 ft CPT-03 119.91 GW @ 50 ft GW@93ft GW = Ground Water Sample SS = Soil Sample In situ groundwater samples were taken at all three locations. Groundwater samples were collected using the Hydropunch groundwater sampling system. The Hydropunch operates by pushing 1.75 diameter hollow rods with a retrievable tip. A stainless steel filter screen is attached to the tip. At the desired sampling depth, the rods are retracted exposing the filter screen and allowing for groundwater infiltration. A small diameter bailer is then used to collect groundwater samples through the hollow rod. One (1) soil sample was taken at the CPT-01 location using a piston type soil sampler. The soil sample was collected in approximately 1 118 inch diameter stainless steel sample rings. The CPT/Hydropunch holes were grouted using our support rig. The grouting ` procedure consists of pushing a hollow CPT rod with a "knock out" plug back down the hole to the test hole termination depth. Grout is then pumped under pressure as the tremie pipe is pulled from the hole. 4