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_ 2. M F,w4 —, _JtEt VII ''.) 7't u •aea4^.*Pr+., r+;�.:.; �u�" taxa. Y - '?!'. .ew _ w, rV Quarterly Sampling The first round of quarterly sampling of six selected groundwater monitoring wells was completed on May 2, 1988. Prior to sampling wells PR-1, PR-2, BHD-1, E-5, E-8, and E-9, a centrifugal pump was used to purge approximately three well casing volumes of water from each. Each well was then sampled with a Teflon bailer equipped with a bottom- emptying valve. The sample was then drained directly from the bottom valve into two 40-milliliter glass bottles with Teflon-lined septa. Sample BHD-1 was also collected in ono; 1/2-liter plastic bottle containing nitric acid preservative. The samples were stored on ice from the time of collection through delivery to the Eureka laboratory. All of the samples were analyzed for BETX by EPA Method 602. Sample BHD-1 was also analyzed for total petroleum fuel hydrocarbons by EPA Method 8015, modified. All groundwater produced during well sampling was contained and temporarily stored on site in 55-gallon drums a pending results of the analytical tests. RECOVERY SYSTEM is F r On March 22, 1988, the recovery system was reactivated with the verbal approval of the City of Stockton Wastewater Control Facility (WCF). The system is currently in t " operation. f Reactivation ? When the recovery system was reactivated, the existing groundwater monitoring wells Is were monitored for any changes in (decline) water levels. The discharge line of the recovery system and the contents of the separator tank were sampled after the recovery t system, had been pumping'ior 15 to 30 minutes. Each sample was collected in four 40- milliliter glass bottles with Teflon-lined septa and into one 1/2-liter plastic bottle t r containing nitric acid preservative. The -samples were stored on ice from the time of i.y collection through delivery to the Eureka laboratory. The samples were analyzed for BETX by EPA Method 602, total petroleum fuel hydrocarbons by EPA Method 8015, modified, and r total lead by EPA Method 6010. Discharge Permit The WCF discharge permit for the recovery system is being held by the WCF pending the finalization of the updated wastewater discharge ordinance. For nowt, the recovery system is regulated by the WCF's April 7, 1988, "Interim Policy," included in Appendix C. Once the permit has been renewed, the WCF has stated that ARCO will be able to continue operation for approximately 2 to 5 years. Annual permit renewal will be required for the current recovery system. After 2 to 5 years of operation, the WCF's discharge permit requirements for the site may change. The WCF assesses each site individually before determining its discharge requirements. The recovery system at the subject site has been operational, and a previous discharge permit had been approved before January 1, 1988. Because of these two factors, ARCO "" may renew the discharge permit with minimal discharge requirements.