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r . 1 < <br />Mr. Robert McClellon <br />September 22, 2004 <br />Page 3 of 11 <br />Soil samples were collected at 5 to 10 -foot intervals for soil characterization, subjective evaluation <br />of hydrocarbon contamination using a photoionization detector (PID), and possible laboratory <br />analyses. Soil samples collected at depths of approximately 10 and 20 feet bgs from each boring <br />were submitted to State -certified Argon Laboratories (FLAP #2359) for analysis. In addition, the <br />soil sample collected from 30 feet bgs in boring S132 was also submitted for analysis because <br />boring SB2 was located in an area of greatest thickness of landfill material. Soil samples were <br />temporarily stored in an ice chest refrigerated to a temperature of approximately 4° C and <br />delivered under chain of custody protocol to Argon Laboratories (FLAP #2359). <br />Discrete groundwater samples were collected through a temporary well screen installed in each <br />boring. A new well screen was installed in each boring to avoid potential cross contamination <br />issues. The water samples were drawn to the surface using a length of small -diameter <br />polytetrafloroethylene (PTFE) tubing with a stainless steel check valve. Samples were temporarily <br />stored in an ice chest refrigerated to a temperature of approximately 4° C and delivered under chain <br />of custody protocol to Argon Laboratories. <br />After sampling, the borings were grouted from the bottom of the boring to the ground surface using <br />neat cement grout. Copies of boring logs are contained in Appendix A. <br />2.2 Laboratory analysis <br />Soil samples selected for analyses were analyzed by Argon for total petroleum hydrocarbons as oil <br />(TPHo) using EPA method 8015 modified, CAM 17 metals, and soluble lead. TPHo and soluble <br />lead was not detected in any of the samples analyzed. Many CAM 17 metals were detected, but <br />all were at levels well below the preliminary remedial goals and hazardous waste designation <br />levels. Analytical results are summarized in Table 1, and a copy of the laboratory report including <br />chain of custody documentation is included in Appendix B. <br />Groundwater samples were analyzed by Argon for TPHo, volitile organic compounds (VOCs) by <br />EPA 8260, and soluble lead. All of the analytes sampled were below the laboratory detection <br />limits. Groundwater analytical results are summarized in Table 2 and a copy of the laboratory <br />report including chain of custody documentation is included in Attachment B. <br />2.3 Discussion of Results <br />Laboratory analyses of soil samples collected beneath the waste buried at the site contained no <br />metals or petroleum hydrocarbons as oil (TPHo) at levels exceeding Preliminary Remedial Goals <br />(PRGs) established by the United States EPA or the State of California. No TPHo, antimony, <br />arsenic, beryllium, cadmium, selenium, silver, or thallium were detected above the laboratory <br />detection limits. Barium chromium, cobalt, copper, lead, molybdenum, nickel, vanadium, and <br />zinc were present at levels considered at or below background levels in San Joaquin County <br />(Dragun and Chiasson, 1991) and at levels one to two orders of magnitude below established <br />PRGs. In addition, no soluble lead was detected in any of the soil samples analyzed. <br />G:\GROUNDZE\Palomino\xvpjitemitfiiial.doc <br />