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' Groundwaterinvestigation,Monitor well Destruction and Installation,and Interim Remediation Pump Test Report Soyett Petroleum,419 S.Main St.,Manteca,CA ' January 30,2004 Page 14 Table 6 Monitoring Well Survey Details ' EM�onitoringr X Y Z (elevation) MW-4R 37.7935465 -121.2164386 35.21 MW-10 37.7936403 -121.2167629 36.09 MW-11 37.7936012 -121.2167628 36.15 EW-1 37.7936536 -121.2I69281 36.23 4.5 MONITORING WELL DEVELOPMENT ' On November 14, 2003, wells EW-1 and MW-11 were developed by surging and bailing the groundwater in the well with a surge block and disposable, polyethylene bailers. MW-4R and MW-10 were dry. A total of ten well-bore volumes were removed from each well during development. The water purged from the ' two wells was brown in color with moderate clarity and improved to clear with good clarity during development. No floating product or sheen was observed and no petroleum hydrocarbon odors were noted in the groundwater purged from wells EW-1 and MW-I 1 during well development. The wells were purged until the temperature, electrical conductivity, and pH of the water stabilized. ' All well-development equipment was cleaned prior to use by washing in a solution of laboratory-grade, non-phosphate detergent and deionized water, and double rinsing with deionized water. The purge water '. discharged from the wells during development was placed in 55-gallon drums, sealed, labeled, and left on site where they will remain pending laboratory analyses. Groundwater Well Development Field Forms are included in Appendix B. 1 5.0 WELL PUMP TEST From November 18 through 21, 2003, Condor conducted a 72-hour constant rate pump test of monitoring ' well MW-11. Pump testing was conducted to determine the short-term pump rate that could be maintained from the aquifer while maintaining a stable drawdown. The results of the pump test will be used to size system components for a pump and treat remediation system to be installed at the site. This section ' includes a description of the site preparation and pump test. 5.1 SITE PREPARATION ' Condor received an Industrial Wastewater Discharge Permit (IWDP) from the City of Manteca"(City) Public Works and the necessary permit from City Building Inspection Division prior to installation of the pump test equipment. The pump and carbon canisters were fenced off and barricades were placed around ' the monitor wells used as observation wells to protect the transducer equipment. Condor received permission from the City Public Works Department prior to discharging the treated groundwater directly to the sanitary sewer system The IWDP can be renewed after installation of the pump and treat systerrl. ' 5.2.. MW-11 PUMP TESTING. Pumping from monitoring well MW-11 using a submersible pump began at 1250 hours on November 18, a 2003. and continliecl_ iininti-minted lmH1 lA1A ],r,,,c nn NTn ._1.a. 71 7nM (ll 4: ...r I-- I-- _1-1 — -- - •-- ..,,__ .. ., .,...�. .. �., x0031, VU-3M vauvua vx uic iicau pressure response were electronically recorded with transducers placed in EW-1, MW-9, and MWA 1. A . total of 38,316 gallons of water were pumped during this period_ Groundwater pumped from MW-11 was 1 ' �� CONDOR