Laserfiche WebLink
r <br />GROUND ZERO ANALYSIS, INC. <br />1714 Main, Street <br />Escalon, California 95320-1927 <br />Telephone: (209) 838-9888 <br />Facsimile: (209) 838-9883 <br />December 29, 2004 <br />Mr. Ross Atkinson <br />California Regional Water Quality Control Board, <br />Central Valley Region <br />11020 Sun Center Drive, #200 <br />Rancho Cordova, CA 95670 <br />OQQ <br />Subject: Workplan for Subsurface Investigation and Broken Tile Re -Use <br />FTG Construction Materials Facility, 925 W. Anderson St., Stockton, CA <br />Dear Mr. Atkinson: <br />As requested in your letter of September 8, 2004, Ground Zero Analysis, Inc. is writing to present <br />you with a Workplan for a soil and groundwater investigation at the subject property. This <br />Workplan also addresses the issue of re -use of the broken tile material currently stored on the site. <br />BACKGROUND <br />Approximately 20,000 cubic yards of broken concrete roofing tile is currently stockpiled on the <br />property. Based upon the concentrations of total petroleum hydrocarbons as diesel (TPHd), <br />leachable concentrations of TPHd and hexavalent chromium (Cr6)in the material reported in the <br />Concrete Waste Tile Sampling Report (Advanced GeoEnvironmental, 09/10/01), the California <br />Regional Water Quality Control Board (RWQCB) has classified the material as a designated waste. <br />RWQCB is requiring an investigation to determine if storage of the broken tile has adversely <br />affected groundwater. RWQCB has also requested that a plan for the proper disposal or re -use of <br />the material be prepared. <br />Geographic and Hydrogeologic Setting <br />The site is located in southwest Stockton approximately one mile south of the Stockton deepwater <br />shipping channel (Figure 1). Land use in the site vicinity is industrial and commercial. The <br />elevation of the site is approximately 10 feet above mean sea level. Depth to groundwater at the <br />site is expected to be approximat 20-30 feet below the ground surface (bgs). According to <br />G:\GROUNDZE\Alcgre\REPORTS\hydptiWKPLAN.doc <br />