Laserfiche WebLink
California#gional Water Quality Con* Board <br /> \v- <br /> Central Valley Region (` 1 <br /> Karl E. Longley,ScD, P.E.,Chair `' z <br /> Linda S. Adams <br /> Sacramento Main Office Arnold <br /> Secremneni r–,.--, p hwarzene er <br /> Enniravuenm/ 11020 Sun Cerner Drive 8200,Rancho Cordova,California 9S670-6114 v —' \,J/I� gB <br /> Protection Phone(916)464-3291 •FAX(916)464-4645 IIu, 1l �l�� V LSI Governor <br /> R � <br /> hitp://wm,w.waterboards.ca.gov/centralvallev <br /> MAY 2 2 2007 <br /> EidVliUi'ii ;tIVT hiEALTH <br /> May 11, 2007 PERMIT/SERVICES <br /> Mr. Mark Adams <br /> Lincoln Center Environmental Remediation trust <br /> 137 Park Place a P, , y„ /Am' <br /> Point Richmond, CA 94801 b <br /> REVIEW OF RESULTS OF FOCUSED MEMBRANE INTERFACE PROBE INVESTIGATION <br /> IN THE VICINITY OF BANK OF STOCKTON, LINCOLN CENTER, STOCKTON, SAN <br /> JOAQUIN COUNTY <br /> Staff of the Central Valley Regional Water Quality Control Board (Regional Water Board) has <br /> reviewed the subject report for Lincoln Center (the Site), Stockton. The report is dated March <br /> 29, 2007 and was received by the CV Regional Board on April 2, 2007. LFR Levine Fricke <br /> prepared the report on behalf of the Lincoln Center Environmental Remediation Trust (the <br /> "Trust") <br /> The purpose of this report is to present the scope of work and the findings of the focused <br /> membrane interface probe (MIP) investigation that was conducted in the vicinity of the Bank of <br /> Stockton, located on the northeast corner of West Benjamin Holt Drive and Pacific Avenue, <br /> adjacent to Lincoln Center shopping village in Stockton. The investigation was voluntarily <br /> conducted on behalf of the Trust to evaluate the possible use of enhanced bioremediation of <br /> contaminated groundwater in the vicinity of the Bank of Stockton. Groundwater has been <br /> impacted with tetrachloroethene (PCE) and some associated breakdown products from dry <br /> cleaners located at the Site. <br /> First, staff concurs with your findings regarding the better definition of lateral and vertical <br /> extent in the sand channel intervals down gradient of the eastern property boundary of the Site <br /> and beneath the Bank of Stockton. In particular, the relatively thin zone of higher permeability <br /> sediments in the Lower A Zone aquifer between the depths of 72 and 82 feet below ground <br /> surface (bgs), which comprise one of the target areas of groundwater impacted with PCE and <br /> associated breakdown products, has been better defined. Staff also concurs with your <br /> conclusion that this target area could potentially be remediated with the use of enhanced <br /> reductive dechlorination (ERD) technology. However, we are concerned that the required level <br /> of understanding of aquifer properties does not yet exist with respect to competing biological <br /> and chemical processes that allow for successful ERD to occur, and for diagnosis of problems <br /> if the ERD technology chosen behaves in undesirable or unexpected ways. <br /> California Environmental Protection Agency <br /> prd Recycled Paper <br />