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® Stantec <br />November 11, 2016 <br />File: 185703326 <br />Attention: Alan Buehler <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive, Suite No. 200 <br />Rancho Cordova, CA 95670 <br />Dear Mr. Buehler, <br />J1?8CE1��D <br />DZC 1 s <br />Eiyy�R ?016 _ <br />P��FR�VICICS (ry <br />Reference: Work Plan Addendum - Stockton Charter Way Commingled Plume <br />440, 441, 508 West Charter Way and 1444 South Lincoln Street, Stockton, California. <br />Commingled Plume Case No. CP0057. <br />On behalf of Bimbo Bakeries USA, Inc. (BBU), Chevron Environmental Management Company <br />(CEMC), Atlantic Richfield Company (ARC), and Equilon Enterprises LLC dba Shell Oil Products US <br />(Equilon), (collectively referred to as Joint Claimants) Stantec Consulting Services Inc. (Stantec) has <br />prepared this Work Plan Addendum (Addendum) to the Work Plan for Installation of SVE/AS <br />Treatment System (Work Plan) dated February 29, 2016, for the above referenced Site (Figure 1). <br />This Addendum was prepared in response to Central Valley Regional Water Quality Control Board <br />(CVRWQCB) letter dated August 15, 2016, and titled "Work Plan Addendum, Stockton Charter Way <br />Commingled Plume (CP0057), 440, 441, 508 W. Charter Way, and 1444 S. Lincoln Street, Stockton, <br />San Joaquin County," prepared by Alan Buehler and a phone conversation between Brian <br />Westhoff of Stantec with Scott Lookingbill of the State Water Resources Control Board (SWRCB) on <br />October 25, 2016. <br />The CVRWQCB letter recommends the installation of an ART well near the vicinity of SMW-11-122 <br />and installed at a depth to adequately target the D zone. Stantec has added the proposed ART <br />well, ART -8, southwest of SMW-11-122 on the 414 West Martin Luther King Jr. Boulevard, Stockton, <br />California site (Figure 1). <br />In the phone conversation between Stantec and SWRCB, SWRCB recommends installing an ART <br />well near SMW-24B in lieu of air sparge wells SAS -1, SAS -2 and soil vapor extraction well SVEW-5. <br />Stantec agrees with the recommendation, the proposed ART well, ART -9 has been added <br />southwest of SMW-24B on the 440 West Charter Way, Stockton, California site (Figure 1). The SWRCB <br />also recommended not analyzing any submerged soil samples. Stantec is amending our field work <br />to evaluate subsurface soils for lithologic evaluation and determine proper well screen locations <br />as part of the scope of work. No soil samples are planned for analysis. <br />Design with community in mind <br />