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COLLECTION AND CERTIFIED ANALYSIS OF SOIL SAMPLES To fill in a data gap, a soil sample was obtained from the 12 to 16 feet bts core representing 15 0-15 5 feet bts (P8-15 5) This sample represents the top of water in the A Zone downgradient of previously sampled location P-3 The sample was obtained from the core which is contained in a four foot by one inch clear acrylic sleeve, by cutting through the acrylic sleeve that contained the desired sample interval The acrylic tube acted as the sample sleeve The tube ends were immediately sealed with plastic end caps The sample sleeve was then labeled and placed on ice for Chain of Custody delivery to the contracted DHS certified laboratory, see Appendix E Methods Qa/QC The sample was delivered with accompanying chain of custody documentation to KIFF Analytical LLC (DHS certified #2236) KIFF analyzed the soil for concentrations of TPH-G, BTEX, 7 Oxygenants and Lead Scavengers (1,2 Dichloroethane and 1,2 Dibromoethane) using EPA method 8260B _CLUSTER WELL INSTALLATION MW6 A-B, MW7 A-B AND R1 A-B, APRIL 9-10, 2001 A WEGE geologist working under the direct supervision of California Registered Geologist 93037 utilized a Woodward Drilling truth mounted drilling rig with 8 and 10 inch hollow stem augers to drill and install the wells, see Figure 3 and Appendix C - borehole logs CLUSTER WELL 6A-B Monitor well 6A was installed using 8 inch hollow stem augers to drill into the first water zone (A Zone) To verify that no underground utilities would be compromised from the drilling the first 5 feet were hand angered Once the five foot depth was reached, 8 inch hollow stem augers were used to drill the boring to the 10 foot depth From the 10 foot depth to top of A Zone sand, the boring was continuously sampled in two foot intervals to determine the exact depth the sandy interval was encountered (top of water) Once the top of sand was determined the boring was drilled to the 16 foot depth with the 8 inch hollow stem augers and then continuously split spoon sampled in two foot intervals to determine the depth to the top of clay (AIB aquitard) Once the top of clay was encountered the boring was drilled to that depth with the 8 inch hollow stem augers F480 2 inch diameter Sch 40 PVC 0 01 inch slotted screen with a 4 inch length bottom cap was placed across from the A Zone sand (12 to 17feet bts) through the augers and 2 inch diameter sch 40 PVC threaded pipe was attached to the screen and brought to surface #2112 sand was then slowly placed between. the 2 inch PVC pipe and the augers to l l feet bts as the augers were staged out of the hole Bentonite pellets were then placed on top of the sand (9 to 11 feet bts) and hydrated with clean city of Stockton tap water An 8 inch diameter traffic rated traffic box was then set in a 24 inch diameter concrete pad in the asphalt street surface approximately 1/4 inch above asphalt grade with 7 Sanchez 2nd QM 2001