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r Chevron • • <br /> Chevron Corporation <br /> 576 Standard Avenue, Rich 94802-0627 <br /> I „y' rrJ <br /> �J <br /> APR 171989 <br /> ENVIRONMENTAL HEALTH April 14 , 1989 <br /> PERMITISERVICES <br /> Response to Your Letter <br /> of March 20, 1989 <br /> Alden Park Project <br /> Mr . David L. Brent <br /> Water Resources Control Engineer <br /> California Regional Water <br /> Quality Control Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, California 95827-3098 <br /> Dear Mr . Brent: <br /> We have received your overall approval of our Mitigation Plan and <br /> Groundwater Monitoring Plan for the Alden Park area of Tracy, <br /> California. We are proceeding with implementation. The purpose <br /> of this letter is to respond to some of the issues you raised <br /> about the objectives of the Mitigation Plan and to clarify the <br /> requirements of the Groundwater Monitoring Plan. <br /> Mitigation Plan <br /> The initial phase of the Mitigation Plan will consist of one <br /> liquids pumping/bioventing well . After analyzing the performance <br /> of this well, we will design a full-scale mitigation system. The <br /> objective of this system will be to remove the nuisance of flow- <br /> ing oil to the residents. We both agree that this is the most <br /> obvious problem at the site. You raised the concern that con- <br /> taminant levels may threaten the beneficial uses of the ground- <br /> water . The results of the Monitoring Plan will show what the <br /> contaminant levels are. We will work with your office, the city <br /> of Tracy, the County, and the State Water Resources Department to <br /> identify the beneficial uses of this aquifer as the project <br /> proceeds. <br /> Revised Groundwater <br /> Monitoring Plan <br /> In our phone conversation of April 4, we agreed to some minor <br /> revisions and clarifications of the Groundwater Monitoring Plan. <br /> Sampling Procedure <br /> Wells will be purged until we measure constant temperature, pH, <br /> and conductivity. Then, samples will be taken using clean teflon <br /> bailers. We will include one field blank and one field spike as <br /> a quality control measure. We expect that we may have difficulty <br /> obtaining a representative water sample from wells where there is <br /> liquid oil on top of the water. We will document whatever <br /> problems arise during the field sampling. <br />