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�. . RECEIVED 19S0 ENVIRONMENTAL Mobil Oil Corporation PERMIT/SERVICES 3800 WEST ALAMEDA AVENUE,SUITE 700 BURBANK,CALIFORNIA 91505-4331 SENT VIA FEDERAL EXPRESS July 2 , 1990 Ms. Laurie Cotulla, REHS MOBIL OIL CORPORATION San Joaquin Co. Public Health FORMER SIS 10-NP4 Environmental Health Division 2375 TRACY BOULEVARD 1601 East Hazelton Avenue TRACY, CALIFORNIA Stockton. CA 95201 BP SIS 11194 Dear Ms. Cotulla: Reference is made to your June 20, 1990 letter. You requested that a PAR work plan be submitted by July 1, 1990. In October 1989, a work plan was submitted to the San Joaquin County Public Health Services (SJCPHS) and the RWQCB. A copy is enclosed. To this date we have received no comments or approval. Our consultant proceeded with the well installation and work in accordance with the subject work plan. An interim report was submitted on April 16, 1990, as you mentioned in your June 20, 1990 letter. Based upon verbal approval by Mr. Harland Knoll of SJCPHS, two offsite monitoring wells were installed on April 23 , 1990. All necessary permits were obtained from SJCPHS prior to drilling. The results of the laboratory analysis of the soil and ground water samples from the additional monitoring wells will be submitted by July 6, 1990. As mentioned in the April 16, 1990 interim report, there are ongoing dewatering activities in the vicinity of the site. Our consultant believes this dewatering has affected the groundwater condition and the contaminant migration beneath the site. The remainder of the investigation has therefore been delayed until the dewatering is complete. We are evaluating all available data, including the analytical results from the two offsite monitoring wells, before finishing the tasks remaining in the work plan. We feel that a PAR work plan is not necessary now. The completed PAR will be submitted, as you requested, by October 1, 1990. If you have any questions, please feel free to contact me at (818) 953-2519.