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Upts • Ms Margaret Lagorio, Supervising REHS Page 3 San Joaquin County Environmental Health Department October 11, 2004 of the other soil samples and a PID indicated readings of 0 ppm for VOCs for all other depth intervals ' sampled during drilling Based on field data, the soil sample collected at 30 feet bgs from B-26 and the samples collected from the capillary fringe at approximately 60 feet bgs in all three borings were selected for laboratory analysis Analytical results reported GRO, BTEX, and fuel oxygenates as below laboratory detection limits in all samples analyzed Soil analytical data are summarized in Tables 1 and 2 Laboratory analytical reports and chain-of-custody documentation are included in Attachment C Groundwater Grab Sampling and Analytical Results Grab groundwater samples were collected from first groundwater encountered A new disposable bailer was used for each bonng sampled All samples retained for analysis were collected in glass volatile organic analyte (VOA) containers with self-sealing screw on caps, samples were labeled and placed in a cooler on ice for delivery to Sequoia in Petaluma, California, under chain of custody Analytical results for groundwater samples reported GRO and xylene in boring B-26 at concentrations of 280 micrograms per liter (1tg/L)and 0 93 Ltg/L, respectively Boring B-25 reported 1,2-DCA at a concentration of 1 3 µglL All other analytes were reported as below laboratory detection limits Groundwater analytical data are summarized on Figure 2 and in Tables 3 and 4 Laboratory analytical reports and chain-of-custody documentation are included in Attachment C Equipment Decontamination and Soil Cutting and Wastewater Disposal All down-hole drilling equipment used during soil and grab groundwater sampling was thoroughly decontaminated between drilling locations by steam cleaning Soil cuttings and wastewater generated during drilling activities were placed in labeled Department of Transportation (DOT)-approved 55- gallon steel drums and transported by Dillard Environmental Services (Dillard Environmental) to an ARCO service station located at 900 S Cherokee Lane for storage pending disposal Composite soil cutting samples were collected from the drums in 6-inch long, 2-inch-diameter, brass liners with the ends sealed with Teflon°tape and plastic end caps, labeled, and placed in a cooler on ice for delivery to Sequoia in Petaluma, California, under chain of custody The samples were submitted and analyzed for GRO, by EPA Method 8015B (preparation EPA Method 5030), BTEX by EPA Method 8260B (preparation EPA Method 5030), and total lead by EPA Method 6000/7000 series On March 30, 2004, Dillard Environmental picked up and transported the soil drums to the Republic Services Vasco Road disposal facility in Livermore, California, and the wastewater drums to Instrat Services in Rio Vista, California, where they were disposed of as nonhazardous waste Analytical results for the composite samples are included in Table 1 Disposal documentation is included as Attachment D i K%WprocessV5 BP ARC010076012004 Assessment1760 site assessment report with workplan V2 04 doc