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Mr. Ron Beffa May 6, 1987 Page 5 TABLE Y MONITORING DATA Well ,Read Deptb to Product Date Elevation hater Thickness 3/09/87 MW-1 100.59 23.26 0 MW-2 100.46 23.43 0 MW-3 100.00 23.93 0 3/23/87 •MW-1 100.59 22.96 0 MW-2 1C0.4"I 23. 16 0 MW-3 100.00 23.09 0 The wells were developed by hand bailing and sampled on April 23, 1987 with an EPA approved Teflon sampler. Groundwater samples were collected, preserved and transported under chain-of- custody in accordance with GTIIIs SOPs 9 , 10 and 11 ( see Attachment 1 ) . Laboratory analysis for total hydrocarbons , benzene , toluene and xylene was performed by modified EPA Method 602 . in addition, water samples were collected and analyzed for chlorinated pesticides and PCBs by EPA Method 606 and inorganic minerals by methods referenced in the California Administrative Code, Title 22 , Section 66700. The laboratory test results are presented in Attachment 2. The laboratory tests results recorded concentrations of i total hydrocarbons ranging from .0563 parts per million (ppm) in well 3 to 1.825 ppm in well 1 . The concentrations of chlorinated pesticides and PCBs were not recorded above method detection limits. The following inorganic substances were detected at concentrations above method limitations : barium , iron , manganese, arsenic, cadmium and nitrate. Research of available well records from city, county and state agencies recorded two private wells, two Irrigation wells and eight Municipal Wells within a one-mile radius of the site (see Figure 5) , The nearest privately owned well Is located approximately 1/3 of a mile northwest of the project site in an up ground water gradient direction. The nearest municipal well Is located approximately 1/8 of a mile north of the project site, also in an up ground water gradient direction and is currently in use. The City of Stockton currently receives ninety percent of its water supply from ground water and ten percent from surface