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STATE O�:CALIFORNIA-Environmental Protection {ncy PETE WILSON,Governor <br /> CA.LIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGIONAI+TH p <br /> 3443 Routier Road, Suite A <br /> Sacramento,CA 95827-3098 <br /> PHONE: (916)255-3000 93 OCT 1 S PH (I <br /> FAX (916)255-3015 5 J <br /> 8 October 1993 <br /> Mr. Nick Nickerson <br /> Unocal <br /> 2000 Crow Canyon Road, Suite 450 <br /> San Ramon, CA 94583 /'5-6 to <br /> REVIEW OF FOUR-PART WORKPLAN, FORMER PM AG SITE, STOCKTON <br /> Thank you for submitting the four-part workplan covering soil sampling, monitoring well <br /> abandonment, monitoring well installation, and groundwater monitoring at the former PM Ag <br /> Products facility on Washington Street in Stockton. The workplan is approved with the <br /> following comments: <br /> Section 3.1: <br /> a. The soil cleanup level is 100 ppm total nitrogen, not 100 ppm TKN. <br /> Sections 3.3 and 3.4: <br /> a. Board staff feel that the installation of 2" monitoring wells is not practical. We strongly <br /> suggest that 4" wells be installed. . <br /> b. We understand that final placement of the wells will be determined after reviewing the <br /> results of the soil sampling, and that well construction details (length of well, length of <br /> screen) will be determined as the wells are drilled. <br /> C. The workplan implies that the wells will be purged before groundwater elevations are <br /> measured. We require that the elevations be measured before any of the wells are <br /> purged. <br /> d. The initial groundwater samples must be analyzed for TDS, nitrate, ammonia, organic <br /> nitrogen, and general minerals. Quarterly samples *oust be analyzed for a minimum of <br /> TDS, nitrate, ammonia, organic nitrogen, and common anions. <br /> With the addition of the above comments, the workplan is approved. Please let me know when <br /> you have scheduled your field work. I can be reached at (916) 255-3104. <br /> WENDY WYELS <br /> Ag Regulatory Unit <br /> cc: Mr. John Rapp, Sierra-Pacific Groundwater Consultants, El Dorado Hills r <br /> Mr. Mike Infuma, San Joaquin County Environmental Health, Stockton <br /> Ms. Charlene Wall, Port of Stockton <br /> Mr. Dale Matthew, PM Ag Products, Illinois <br /> Mr. Jack Holm, Cargill Molasses, Stockton <br />