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KAPREALIAN ENGINEERING, INC. <br /> K E I H Consulting Engineers <br /> P. O. BOX 913 <br /> BENICIA, CA 94510 <br /> (415)676-9100 (707)746-6915 <br /> July 24, 1987 <br /> San Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> P. O. Box 2009 <br /> Stockton, CA 95201 <br /> Attn: Mr. Doug Wilson <br /> Re: Drilling Plan/Proposal � .?7 <br /> MOBIL Terminal EfrVii LN' <br /> FAL Navy Drive f EI1lv�l) `FAL HE4LTH <br /> Stockton, California (SERVICES <br /> Dear Mr. Wilson: <br /> Enclosed please find three (3) Applications for Permit to drill <br /> and install three groundwater monitoring wells at the referenced <br /> site. The monitoring wells are being installed by Kaprealian <br /> Engineering, Inc. (KEI) , agent for Mobil Oil Corporation to <br /> comply with the requirements of the California Regional Water <br /> Quality Control Board (CRWQCB--Central Valley Region) for fuel <br /> leaks from underground storage tanks. <br /> Two 285 gallon fuel storage tanks were removed from the reference <br /> site on April 13 , 1987. The soil sample from beneath "Tank All <br /> (shown on the attached sketch) had concentrations of diesel fuel <br /> of 220 parts per million. The proposed three monitoring wells <br /> will be drilled around Tank A for the following reasons: <br /> To comply with the CRWQCB requirements <br /> To determine if the shallow groundwater has been impacted <br /> To determine the hydraulic gradient of the area <br /> Drilling will be performed using Hollow-stem flight auger <br /> drilling equipment. Soil samples will be taken during drilling <br /> with a California-modified Split Spoon sampler. Soil samples <br /> will be collected every five (5) feet, and will continue until <br /> the first groundwater is encountered. The stratigraphy of the <br /> borings will be logged by KEI 's geologist. <br /> After completion, the wells will be developed. Water samples <br />