ARCHIVED REPORTS_XR0006746 CASE 1

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Following the groundwater level measurements, each of the wells was purged and sampled The wells were purged using a decontaminated bailer until at least three well casing volumes were extracted and/or after groundwater temperature, pH and electrical conductivity values had stabilized Following well purging and recharge, groundwater was sampled from the wells using dedicated disposable bailers and laboratory-supplied containers Each sample was labeled, packaged in an iced cooler and transported with chain-of-custody documentation to Kiff for analysis Kiff analyzed each of the groundwater samples for TPH-as-gasoline, BTEX, MTBE, DIPE, ETRE, TAME, TBA, and 1,2-DCA by EPA Method 8260B ' Waste soil generated during the drilling operations was stockpiled on plastic sheeting pending profiling and proper disposition Waste liquid from equipment decontamination and well purging was contained in 55-gallon drums The drums were labeled and are currently stored on-site pending wastewater accumulation and eventual profiling and proper disposal 24 Domestic Water Well Sampling and Analysis To further identify domestic water wells in the site vicinity, and to determine if any domestic wells had been impacted by gasoline hydrocarbons, Ramage Environmental completed an expanded water well survey and collected water samples from 12 domestic water supply wells On November 9 and 10, 2000, Ramage Environmental conducted a door-to-door water well survey Along Raylow Avenue and Mylnar Avenue, information was obtained directly from the residents Ramage Environmental also conducted a walking tour of the entire site vicinity to search for additional water wells A one-page written notice was delivered to each property within ' 1,500 feet of the site, asking for any information on water wells that may be located at these parcels Approximately 300 notices were delivered By interviewing residents, Ramage Environmental identified a total of 56 domestic water wells along Raylow Avenue and Mylnar Avenue, between East Yosemite Avenue to the south and North ' Street to the north A water well exists on every parcel within this area, except for the residence at 150 Mylnar Avenue Of the 56 parcels with water wells, only 12 are also connected to city water service In general, the residents were not aware of the construction of their wells A copy of Ramage Environmental's Water Well Survey Addendum dated November 16, 2000 is included as Appendix E This document, previously submitted to PHS/EHD includes a map showing the locations of identified wells, a table listing the addresses of the identified wells, and any available water well drillers reports • 11