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Canepa's Car Wash 248 E Park Street, Stockton, California aka: 642 N. Hunter Street Phase HSite Characterization and July 2, 1994 Quarterly Groundwater Report (May 1994) Page: 2 5,000 gallon tanks, and the third boring, B-3, was located m the center of the former 12,000 gallon tank excavation Boring B-1 was drilled to 56 feet, and laboratory samples were taken every five feet from 15 to 56 feet Borings B-2 & B-3 were each drilled to 515 feet, and each was laboratory sampled every five feet from 15 to 51 5 feet The groundwater table was located between 50 to 52 feet in each of these borings All samples were selected for analysis by the on-site geologist, based on odor, discoloration and portable PID readings as noted on the Boring Logs (Table 1, Appendix A& C) EAfter receipt of analytical data from these borings, a second phase of drilling, including bonngs and monitoring wells, was planned and approved by an addendum letter with the ISan Joaquin County Environmental Health Division On November 10, 11 and 12, WHF, Inc returned and drilled three (3) monitoring wells, MW-1, 2 and 3, and three (3) soil borings to the capillary fringe, B4, 5 and 6 (Figure 2) The three monitoring wells were drilled to 65 feet below ground level, laboratory soil samples taken every five feet from 15 to 65 feet (Table 1, Appendix A), and well casing installed from 0 to 45 feet with well screen from 45 to 65 feet Well completion data is shown on the Bonng/Well Completion logs (Appendix C) These wells were surveyed (Appendix F) and water level readings and water samples taken (Appendix D) for laboratory analyses (Appendix B) The survey data and water level readings were used to calculate the groundwater gradient (Figure 4) The three additional borings were each drilled to 51 5 feet below ground level and laboratory samples taken every five feet from 15 to 515 feet (Table 1, Appendix A) These borings were then backfilled with a bentonite/cement grout to ground level After receipt of analytical data, preliminary lithologic and contamination cross-sections were drawn The cross-sections showed that the lateral limits of contamination had not been defined On January 19, 1994, WHF, Inc was directed by the Environmental Health Division of the San Joaquin County Public Health Services to conduct additional installation of monitoring wells to fully characterize the groundwater contaminant plume 7 through 9th WHF Inc returned and drilled four 4 monitoring wells, From March 7th t gh ( ) g MW4, 5, 6 and 7 (Figure 2) Each was drilled to 60 feet below ground level, sampled every five feet from 20 feet to the water table, and completed as two inch PVC wells with screened intervals of 40 to 60 feet (Table 1, Appendix A & C) These wells were surveyed (Appendix F) and water level readings and water samples taken (Appendix D) for laboratory analyses (Appendix B) The survey data and water level readings were used to calculate additional groundwater gradient maps (Figure 4) r