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STATE OF CALIFORNIA-Environmental ProtectioAcy • PETE WILSON Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> 3443 Routier Road,Suite A .. -t'.1 i'•,C. __ <br /> Sacramento,CA 95827-3098 e <br /> PHONE:(916)255-3000 CIy O' S5 <br /> FAX:(916)255-3015 <br /> auwrr <br /> 8 November 1995 <br /> Mr. John Welch <br /> Attorney at Law <br /> 3620 West Hammer Lane, Suite B <br /> Stockton, CA 95219 <br /> WORK PLAN FOR ADDITIONAL INVESTIGATION, INDEPENDENT TRUCKING <br /> FACILITY, 1145 WEST CHARTER WAY, STOCKTON, SAN JOAQUIN COUNTY <br /> We have reviewed the 11 October 1995 Work Plan for Additional Site Investigation submitted by Wm. J. <br /> Hunter&Associates for the 1145 West Charter Way site in Stockton. We have added Mr. Hunter to our <br /> distribution list. <br /> The scope of the work plan is too limited and needs more details. Mr. Hunter stated that because of the <br /> short time frame which he had to prepare a work plan, more complete details will follow as soon as <br /> qualified vendors and service companies have been selected. Preparation of a detailed and complete work <br /> plan to do investigative work should not be dependent upon the selection of subcontractors to do the <br /> approved work. Even though you did not receive the Board's 13 September 1995 letter until 27 <br /> September, there were still two and a half weeks to prepare an acceptable work plan. In addition, as you <br /> know, we will grant reasonable extensions upon request. <br /> The work plan states that geophysical methods will be utilized to locate possible underground sources of <br /> contamination. This is appropriate although the work plan needs to describe in detail exactly what is <br /> going to be done. We suggest also using air photos to aid in this investigative work. A survey of <br /> neighboring businesses also would be appropriate to study the potential off-site sources of contamination <br /> which may be affecting the site. <br /> Your proposal to obtain soil and ground water samples using a geoprobe-type technique is appropriate <br /> although the work plan should show in a figure the specific sampling locations and describe the sampling <br /> protocol. Mr. Hunter states that the locations of soil borings and "potential" monitoring wells cannot be <br /> determined until after the geophysical work is complete. We disagree with this. Since we are trying to <br /> define the current extent of contamination in the soil and ground water, the existence of ongoing sources <br /> will have no major bearing on the placement of borings and monitoring wells over the time frame of the <br /> work plan. In addition, more monitoring wells definitely are needed to fully define the extent of ground <br /> water contamination. <br /> By 8 December 1995, you are required to submit a detailed work plan to define the full lateral and <br /> vertical extent of soil and ground water contamination. The work plan shall include a proposal to <br />