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WATERWORK <br /> GEOCHEMICAL i GEOTECHNICAL w ENVIRONMENtTAkCJ�" <br /> fe"EU"Aalti <br /> SEP 13 <br /> August 23, 1990 <br /> Mr. Greg Lyon <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.Q. Box 2009 <br /> Stockton, CA 95201 <br /> Re: 1990 Third Quarter Report-Stephens Marine, 4950 West <br /> Brookside Road, Stockton, CA <br /> Dear Greg: <br /> This letter report updates the activities at Stephens Marine <br /> during the third quarrer of 1990 (Figure 1) . Activities during <br /> the quarter have included sampling for dissolved hydrocarbons and $ <br /> ( monitoring of groundwater. <br /> Groundwater monitoring conducted in May, June, and July showed <br /> the water table has fluctuated, due mostly to the tides, between <br /> 1 to 2 feet since September 1989 (Table 1) . The groundwater <br /> gradient maps (Figures 2, 3, & 4) illustrates a west to south- <br /> west gradient at an approximate magnitude of 0.003 ft./ft. <br /> Table 2 shows the; tides and the times the wells were monitored. <br /> The water gradient fluctuates with the tides, but is <br /> predominantly southwesterly. <br /> Groundwater samples were collected from the three wells on July . <br /> 24, 1990, for analysis of benzene, toluene, ethylbenzene, xylenes <br /> (BTEX) and total petroleum hydrocarbons as gasoline and diesel 2 <br /> (TPHG & TPHD) , by EPA methods 8020/8015. The results reported <br /> .low levels ofin MW-1. All other constituents analyzed <br /> for were non date le (Table 3 ). The laboratory reports and <br /> chain-of-custody are presented in Attachment 1. <br /> F <br /> 1710 MAIN STREET e ESCALON, CA 95320 a (209)83&3507 <br /> FRESNO,CA(209) 222-3495 RENO. NV(702) 7$8-6830 <br />