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Canepa's Car Wash .' 6234 Pacific Avenue, Stockton, California May 6, , 1993 Work Plan to Install Monitoring Wells Page 2 4.0 Well Construction All materials used in well construction will be thoroughly cleaned prior to introduction into the boring. A Bentonite or cement and Bentonite rout will be laced at the g g P bottom of the boring as necessary. After the seal has been allowed to set long enough to support the casing (PVC) with end cap and factory perforations for placement into the saturated zone the casing will be placed in the boring. The screen and filter pack will be as noted in the well construction drawing. The casing and end caps will be threaded and no glue will be used to cement the casing sections together. The filter pack will extend 2 feet above the perforated zone. A Bentonite seal 2-3 feet thick will be placed in the annular space above the filter pack followed by a cement grout to the surface. Seal and filter pack elevations may change based on the underlying geology. The wells will be protected by cristy boxes installed flush with the ground surface. The on site geologist will log the soil borings and provide well logs with the report to the San Joaquin Coutny Environmental Health Department. 5.0 Sampling All soil sampling equipment will be thoroughly steam cleaned before and between sampling-to prevent cross contamination. Relatively undisturbed soil samples will be obtained every five feet (5') using a modified California split spoon sampling device with brass liners. The sampler will be driven by a 140 pound hammer repeatedly falling 30 inches. The blow counts necessary to drive the sampler will: be .recorded for l evaluate the consistencies of the materials. These samples each � inch interval to help e alu les p will be analyzed for Total petroleum hydrocarbons using the TUFT testing procedures. The bottom soil sample in each well will be tested for 1,1,1, trichloroethane using EPA method 8010. This compound is being tested for because it was found in the soils spoils pile test sequence. Water samples will be obtained after the wells are developed. Development will consist of pumping approximately 3 to 5 well volumes of water from each well, or until the water is free of sediments, and the pH, conductivity, and temperature have stabilized. The samples will be tested for Electrical Conductivity, using a conductivity meter, pH using a pH meter and temperature using a thermometer.