Laserfiche WebLink
KAPREALIAN ENGINEERING, INC. '•`. � ,�� <br /> �( Consulting Engineers EN J,� �` <br /> PO BOX 996 • BENICIA, CA 94510 ���r'Q� <br /> (707) 746-6915 • (707) 746-6916 + FAX (707) 746-5581 <br /> KEI-P89-110 �� <br /> December 10, 1990 <br /> PROPOSAL TO <br /> UNOCAL CORPORATION <br /> for the <br /> Unocal Service Station #5421 <br /> 7303 Pacific Avenue <br /> Stockton, California <br /> GROUND WATER MONITORING, SAMPLING AND ANALYSIS <br /> INTRODUCTION <br /> Preliminary investigation of the ground water conducted in October, <br /> 1990 at the referenced site showed the presence of detectable <br /> levels of total petroleum hydrocarbons (TPH) as diesel in well MW1, <br /> and TPH as gasoline and benzene in well MW3 . Per our recommen- <br /> dations described in Kaprealian Engineering, Ines. (KEI) report <br /> KEI-P89-1104 .R7 dated December 10, 1990, KEI proposes the following <br /> work plan. <br /> PROPOSED TASK <br /> 1. Monitor all monitoring wells on-site on a monthly basis. <br /> Record the elevation of the water table and any abnormal <br /> conditions noted during inspection, including presence of <br /> product and sheen. <br /> 2 . Purge and sample ground water from all monitoring wells <br /> on a quarterly basis, and analyze for TPH as gasoline and <br /> benzene, toluene, xylenes and ethylbenzene on a quarterly <br /> basis. In addition, ground water from well MW1 (adjacent <br /> to the waste oil tank) , will be analyzed for TPH as <br /> diesel, total oil and grease, and EPA method 8010 con- <br /> stituents. Prior to sampling, water table elevation will <br /> be recorded as well as the presence of any free product. <br /> 3 . Prepare quarterly technical reports summarizing the field <br /> activity water sampling and analyses with discussion and <br /> recommendations. <br /> The purging of ground water and sampling should continue for 12 <br /> months. This proposed monitoring and sampling program should be <br /> re-evaluated after 12 months. <br />