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{ <br /> LEVI N E•FRICKE <br /> CGNSULTING ENGINEERS AND HVUROGEOLOGISTS <br /> December 13, 1990 LF-1875/1876 <br /> Mr. Kevin Huber M � 3 � � <br /> s.,,,. <br /> Grupe Development Company �R � � �����.�� <br /> of Northern California ENV I�;ONI NEN1 e i L <br /> 2291 West March Lane <br /> PE ������� ��i/ICE:i <br /> Stockton, California 95201 <br /> Subject: Summary of Ground-Water Monitoring Results in Area 3 , <br /> Area 1, and the Ripkin Property of the Brookside <br /> Development Site, Stockton, San Joaquin County, <br /> California <br /> Dear Kevin: <br /> Over the past several months we have completed the third round of <br /> quarterly ground-water monitoring in Area 3 , and the second round <br /> of quarterly sampling at the Ripkin Property and Area 1 of the <br /> Brookside Development Site, Stockton, California. The results of <br /> these investigations have been presented in several reports, <br /> which are listed in Attachment A. These reports have been <br /> submitted, in accordance with your authorization, to the Central <br /> Valley Regional Water Quality Control Board (RWQCB) , and the San <br /> Joaquin County Public Health Services, Environmental Health <br /> Division. The following presents a brief summary of our findings <br /> to date, and our recommendations concerning them. <br /> Rivkin Property - Results from two rounds of sampling <br /> monitoring well LF-10, located in the vicinity of the <br /> reported former location of an underground gasoline storage <br /> tank, have shown no detectable concentrations of petroleum <br /> hydrocarbons or benzene, toluene, ethylbenzene, or xylenes <br /> (BTEX) in ground water. Therefore, further monitoring of <br /> this well does not appear to be warranted. <br /> Area 3 - Milk Barn <br /> Concentrations of petroleum hydrocarbons were below <br /> detection limits in well LF-5, located in the vicinity of <br /> the former milk barn, during the three rounds of quarterly <br /> ground-water sampling. Therefore, continued sampling of <br /> this well does not appear to be warranted. <br /> 1900 Powell Street, 12th Floor <br /> Emeryville, California 94608 <br /> (415) 652-4500 <br /> FAX (415) 652-2246 <br /> ur^Bnln; 'r viire, G,, TaYuh055ee, FL <br />