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' A1�TALI`TICiPSULT3t GrItIDIINI?WATBR Ytl�g e�'es!i�rar►la Stucktvp Sample or Ethyl- ell Number Sample Date TRPH-d TPH-g Benzene Toluene Benzene Xylenes i MW-4 06/20/94 ND ND ND ND ND ND 09/19/94 ND ND ND ND ND ND f: 12/15/94 ND ND ND ND ND ND MW-5 06/20/94 ND ND ND ND ND ND 09/19/94 ND ND ND ND ND ND 12/15/94 ND ND ND ND ND ND MW-6 06/20/94 ND 3700 200 44 41 150 09/19/94 ND 2000 100 ND 90 125 �= 12/15/94 ND 3470 96 7 21 147 f:# Sough SW-A 01/13/95 ND ND ND ND ND ND Reporting 06/20/94 50 50 0.3 0.3 0.3 0.3 Limit 09/19/94 50 1 3 3 3 3 12/15/94 50 50 0.3 0.3 0.3 0.3 01/13/95 50 50 0.3 0"3 0.3 0.3 i 1 ND: Not detected above the laboratory reporth*limit i MCLs inµglF:benzene=1;toluene=100;elhylbenzene=680;total xylenes=1750 := SUMMARY -; Village West Marina is situated on organic, silty, and clayey sediments immediately adjacent to .'.� Fourteen-Mile Slough in the Central Valley Geomorphic Province of California. Monitoring wells MW-4, MW-5, and MW-6 were sounded on August 24, September 19, _= October 25, November 28, and December 15, 1994, and January 10, 1995 (per monthly sounding/tidal influence requirements of the SJCPHS-EHO in a letter to Mr. Dwight Davis of the Pegasus Group received on August 4, 1994). Utilizing a KeckO interface probe, the W.W. ''A Irwin, Inc. staff geologist has intercepted the piezometric surface in each well at an average depth of 13.75 feet on six occasions between August 24, 1994 and January 10, 1995. The i shallowest average depth to the water table was 12.23 feet on January 10, 1995 (first part of ` winter). The deepest average depth to the water table was 1498 feet on September 19, 1994 (end of summer). Due to a field error, the clock times of soundings were not recorded on August 24, 1994. Table 2 lists clock times of soundings, and times and heights of highest & lowest tides which might affect the movement of ground-water underlying the area of interest. a Using the three-point method, the most recently calculated local direction of ground-water flow on January 10, 1995 was approximately S67°E along a gradient of 0.023 foot/foot. The flow direction has shifted 20° to the south since the completions of the three monitoring wells. WW.Irwin,Inc. } Project No.33016.04 January 1995 9 L`}