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�U bl.0 T I SERVICE H hJ <br /> PAGE . E12 <br /> SOM ca <br /> MECHANICAL CONTRACTORS <br /> 1919 Market Street <br /> P.O.Box 12954 <br /> L5 ` Oakland,California 94604 <br /> V c� (415)934-2333 <br /> Contractors License No. 184480 <br /> JUIN F 199 <br /> June 6, 1990 )N[ <br /> F� <br /> W.F. Lewis Construction ' <br /> 506 Glide Avenue J LIN 0 9 1990 <br /> West Sacramento, California 95891 <br /> �"VIRONNIENTAI HFA,; <br /> PF!?,,T <br /> Reference: Arco $0595, Stockton - <br /> Gentlemen: <br /> As per our discussion concerning the tanks located at 6100 North Highway 99, <br /> Stockton, California: <br /> These tanks were precision tested on May 31st using the Petra-Tate system. <br /> The test results were Inconclusive due to several factors. There may be a ball <br /> check assembly that Is not accessible. This would allow product to bleed slowly <br /> Into another line. The tanks are very long and even though proper steps <br /> taken to eliminate air, a pocket may still exist. were <br /> The annular space In these tanks Is filled with a water type solution. This solution <br /> shows no evidence of any fuel. <br /> It's my opinion that further site investigation is necessary to determine the source <br /> of this problem. I believe the problem Is something that is due to tank expansion, <br /> entrapped air, or a mechanical device, and not a tank failure. <br /> The product lines were also tested and they proved to be tight. <br /> Should you have any further questions concerning this site I can be contacted at <br /> (415) 834-2333, <br /> Very truly yours, <br /> SC T CO. OF ALIFORNIA <br /> Ja aro <br /> Environmental Estimator <br /> JG:JnJ <br />