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San Joaquin Motor Pool Facility May 11, 1999 Site Assessment Report . However, the regional direction of groundwater movement in the vicinity of the SITE is approximately in a westerly direction Groundwater elevations for the two (2)monitoring wells are presented in Table 1 and Figure 5 10.2 Groundwater Sampling On April 14, 1999, prior to sampling, a minimum of three (3) casing volumes of groundwater were purged from each well until measurements of pH, electrical conductivity, temperature and turbidity equilibrated Groundwater was purged using a Smeal development rig equipped with an 2 5 gallon aluminum bailer The bailer was decontaminated prior to purging each well Groundwater was allowed to recharge to at least 80 percent of the static level or for two hours after well was purged prior to sample collection Groundwater samples were collected in the appropriate sampling containers, stored at <4° C, and delivered to Calscience Environmental Laboratories, Inc. of Garden Grove, California, a State-Certified laboratory under proper chain- of-custody protocol for analyses Field procedures are presented in Appendix A and purge records are presented in Appendix E ' 11.0 WASTE DISPOSAL Soil cuttings and decontamination, development, and purge water were stored in Department of Transportation(DOT)-approved 55-gallon closed-top steel drums until waste characterization profiling could be completed Upon receipt of analytical data the soil cuttings (5 61 tons)were transported to TPS Technologies, Inc in Richmond, California by Ecology Control Technologies (ECI) of Richmond, California The decontamination, development, and purge water (235 gallons) from soil borings/wells and the ansate (190 gallons) from UST's No 4 and 8 was transported to Industrial Service Oil Company in Los Angeles, California for disposal by Nor Cal Oil The soil stockpile was used as backfill for the UST no 4 excavation All waste manifests are presented in Appendix C 12.0 LABORATORY ANALYSES AND RESULTS On-SITE laboratory analyses of the soil samples were conducted by Baseline On-Site Analyses, ' a State-Certified mobile laboratory located in Huntington Beach, California Stationary laboratory analysis of groundwater samples were conducted by Calscience Environmental Laboratories, a State-Certified laboratory located in Garden Grove, California ' The soil samples were analyzed for the gasoline and/or diesel fraction of total petroleum hydrocarbons (TPH-G and TPH-D) and benzene, toluene, ethyl benzene, total xylenes (BTEX) and methyl--ternary-butyl ether (MTBE) in general accordance with EPA Method No M8015 and EPA Method No 8020A, respectively In addition, the soil samples associated with the UST removal/abandonment were analyzed for total recoverable petroleum hydrocarbons (TRPH) 1 using EPA Method 418 1 The sample with highest concentration of TRPH was analyzed for Volatile Halogenated Hydrocarbons, Polychlorinated Bipheynls (PCBs), and metals using EPA Method No 8010, EPA Method No 8080, and EPA Method No 6010, respectively ' 7 e