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*UNIM <br /> July 3, 1`)91 <br /> Former Unocal Station 2551), Stocklon, California <br /> c,-ivitv (Apptied GeoSvstellis. �\prll 28. 198s, Report No. <br /> the soil underlying the tank flg wells 1%1\V-1 through \IW-3 <br /> -Water nionitor <br /> 38012-1). In June 1988, we installed ground <br /> (Applied GeoSystems, July 28, 1988, Report No. 38012-2), Results indicated a further <br /> investigation of ground water down-gradient was warranted- TI'Crefore,in August 1989,two <br /> ground-water wells were installcli Offsite to delineate disc ved hydrocarbons (Applied <br /> GcoSystems, December 12, 1990, Report No. 38012-5). <br /> In response to the detection of hydrocarbons in soil and ground water,Applied GeoSvsterns <br /> June 1988. Results of 1)1:cvious <br /> began periodic monitoring of the ground waler ul <br /> monitoring events indicated that dissolved Ii yd ro carb of's were (jejected in water samples <br /> in <br /> collected from the five wells; the "'911cs' collcentr,.1tiolls of hydrocarbons were detect" <br /> g -watcr flow to be northeast front June <br /> well NW-2. We evaluated tile direcn of round was 0-002, The <br /> 1988 to May 1990 <br /> c dry). The average gradient <br /> (before the wellstiower <br /> . - the northeast as shown Oil Plate 2. <br /> direction Of ground water flow for flay 30, 1990, Was 10 t <br /> Ground-Water Sarripring <br /> ite May 29. 1991,to collect ground-water samples <br /> An Applied GeoSvstems geologist was ons <br /> analysis of dissolved hydrocarbons using <br /> from wells MW-4 and 1%1W-S for subjective noted no subjective <br /> Tile geologist <br /> procedures ,umma.­izecl in an attachment to this report <br /> evidence of hydrocarbons in tile two wells. Cumulative results of subjective analyses are <br /> presented in Table L <br /> The geologist purged wells NIW-4 and and collected water samples for laboratory <br /> in the Field and accompanied the <br /> analyses. A Chain of Custody Record was initiated The methods of ground-water <br /> samples to the laboratory. A copy of that record is attached. s stored onsite <br /> sampling are discussed in an attachment to this report. The I urge water wa <br /> in properly labeled 17-E steel drums pending the results of laboratory analyses. At Unocal's <br /> IV removed and disposed of by Armour Petroleum <br /> request, drummed water was subsequent <br /> of Fairfield, California on June 7. 1991. <br /> 2 <br /> 39012-7 <br />