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a <br /> r <br /> Mr Chuck Carmel <br /> December 16, 1992 <br /> Page 2 <br /> r•t <br /> Current and historical analytical results are summarized to Table 3 The August 1992 <br /> analytical results are shown on Figure 2 Figure 3 illustrates logarithmic contouring of <br /> benzene data for the August 1992 sampling event Again, well W-2B was not used on <br /> contouring as it is not completed in the same zone as the other wells The complete <br /> laboratory report for the August 1992 sampling is presented m Exhibit A <br /> Discussion <br /> The direction of groundwater flow at this site continues to be to the southwest under a <br /> gradient of 0 002 On August 18, 1992, the depth to water ranged from 65 14 feet to 68 07 <br /> feet Water levels have decreased an average of 5 03 feet in the monitoring wells since the <br /> May 1992 quarterly sampling event <br /> BETX and TPH-G constituents were not detected in the samples collected from monitoring <br /> wells W-2B, W-5, W-6, W-7, W-8, and W-11 Since the May 1992 sampling, most of the <br /> detectable BETX constituent and TPH-G concentrations have decreased Wells W-10 and <br /> W-12 showed slight increases in benzene and TPH-G, respectively <br /> Status of Site Remediation <br /> • A vapor extraction and treatment system has been operating at this site since December 1991 <br /> As of August 1992, approximately 33,200 pounds of hydrocarbons have been extracted and <br /> treated from beneath the site. A groundwater extraction and treatment system is being <br /> constructed and is anticipated to begin operation during October 1992. <br /> Please contact me or Ms. Tina Bauer at (916) 444-0123 if you have any questions regarding <br /> this quarterly report. <br /> Very truly yours, <br /> BROWN AND CALDWELL CONSULTANTS <br /> 7 <br /> )(U�� <br /> Y <br /> a Lucas, R G #4301 <br /> Project Manager <br /> JL WL mkw <br /> Enclosures <br /> cc Mr Gordon Boggs, California Regional Water Quality Control Board, <br /> JCentral Valley Region <br /> s Laurie Cotulla, San Joaquin County Local Health District <br /> Brown and Caldwell sr FWEPan wua r <br /> Consuitants <br />