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I 3 <br /> Ij <br /> is 1 <br /> Field Report <br /> Groundwater Sampling <br /> Grantline Plaza <br /> Tracy, California <br /> On March; 8, 1991, ROY F. WESTON, INC. (WESTON) conducted a groundwater <br /> sampling program:,at the Grantfine Plaza site at 350 West Grantline Road 'in Tracy, <br /> California..I The field work was conducted in an effort to determine if petroleum <br /> compounds were present in the groundwater at the site. <br /> i <br /> i! I <br /> Water samples were taken from the three monitoring wells located on the site. The wells <br /> are idantifed as MW-1, MW-2, and MW-3 and the water samples collected were nan.id <br /> after the walls from! which they were taken. <br /> Prior to purging each well, measurements of total well depth and depth to water were <br /> taken. From these measurements, the standing water volume within the well casing was <br /> calculated.. A submersible pump was used to purge each four inch well of at least three <br /> well volumes. Physical parameters of pH, electrical conductivity, and temperature were <br /> collected from the purge water. This information is presente.d in Table A-2. A clear teflon <br /> bailer was'then used to collect the water samples. <br /> TABLE A-2 <br /> Field Water Ouality Measurements <br /> Eric! of Purge Values <br /> March 8, 1991 <br /> Well/Sample pH Temperature Conductivity <br /> (°F) (umhos) <br /> MwI i 7.8 65.2 2270 <br /> MW-2 7.8 62.7 2040 <br /> MW-3 7.57 65.5 2660 <br /> The bailer used to sample each well was attached to new thin nylon line and lowered into <br /> the well by hand. The bailer was filled and brought to the surface. The water in the <br /> bailer was carefully;poured into laboratory prepared 40 milliliter glass bottles (VOAs) and <br /> A _ 6 <br /> I <br /> i <br /> P <br />