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& 7 y i L'tLi' f ADelta consultaants,nc. eEn y x x re + 3330 Data DriveREC Rancho Cordova,CA 95570 916/638-208 FAXV6/63858385 DEC 21 ENVIRONMENTAL Hr 4'i.';H P£RMIr,S;;;`l,; December 20, 1989 Ms. Diane Lundquist Shell Oil Company Post Office Box 4013 Concord, California 94324 Subject: Addendum, Phase I Hydrogeolo>aie Assessment Report i 7700 Moreland Court,;tockton, California Delta Project No.40-MI46 Dear Ivs. Lundquist As requested by the San Joaquin County Division of Environmante Health (County), this Setter supplements the hydrogeologic assessment performed at the subject site. Included are laboratory results on a sample collected from the site's water supply well, the well location, the fire hydrant location,and a discussion of a seepage pit permitted on August 31, 2970. On November & 1989, Delta Environmental Consultants Inc. (Delta), collected a ground ester sample from the site water supply well. The location of the well is shown on Figure 1. The sample was collected from a spigot located adjacent to the well head and submitted to a State of California certified laboratory for analysis of total petroleum hydrocarbons as gasoline by U.S. Environmental Protection Agency(EPA)Method 8013,halogenated volatile organics by EPA Method 8010,aromatic volatile organics by EPA Method 8020;1,2-dibromoethane and 1,2-dibromo-3-chloropropane by EPA Method 544, and organic lead by California Luft Manual, 12/87. The laboratory data sheets are Y enclosed All parameters were below detection limits. The fire hydrant location is shown on Figure 1. A copy of a septic system permit on file at the County is also enclosed. The penait issued on August 31, 1970,was for a seepage pit to be installed at the site. The proposed location of the pit shown on the enclosed sketch map included with the permit. Apparently,it was designed to serve as an infiltration basin for drainage from the service bay 7r of the station. It is unknown whether or not the seepage--git was_.eger constructed No evidence of x, the pit—was abseived during Deila's site visit on November 8, 1989. Delta had been asked by 114s. Darlene Reuss of the County to sample the water supply welt with a bailer otter , to:be removed for service. We have since learned that the pump was replaced on �19�:;Apparently the water level in the well was 68 feet below the surface i Practical Solutions to Environmental Conc9rns „lam - IBM IMMININE OR