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California Igional Water Quality9ontrol Board <br /> Central Valley Region <br /> Winston Hickox Ed J.Schnabel,Chair Gray Davis <br /> SecretaryforGovernor <br /> E"ironmental Sacramento Main Office ,, t <br /> Protection Internet Address: http://wwwswrcb.ca.govhrwgc65 <br /> 3443 Routier Road,Suite A,Sacramento,California 958273003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> Mr. Mark S. Grover 6 January 1999 <br /> Grover Landscape Services, Inc. <br /> 2825 Kieman Avenue <br /> Modesto, CA 95356-9749 <br /> GROVER LANDSCAPE SERVICES,MANTECA COMPOSTING FACILITY,SAN JOAQUIN <br /> COUNTY(Case No. 4057) <br /> I have reviewed your 12 December 1998 letter and the report from Twinning Laboratories on soil <br /> sampling at your former composting site. The report was required by the facility's Waste Discharge <br /> Requirements Order No. 96-115 (WDRs)for closure of the site. The Twinning report presents the <br /> analytical results for 12 samples collected at the site. Four samples were collected from north and south <br /> detention ponds, five from background locations and three from compost storage areas. These sample <br /> locations were approved in my 16 October 1998 letter to you. <br /> The Twinning report concludes that most of the constituents analyzed in the compost storage areas are <br /> similar to background values. One storage area sample significantly exceeded background values for <br /> chloride and sulfate. The total concentrations in this sample were 120 mg/kg of chloride and 260 mg/kg <br /> of sulfate. These values,however, do not exceed our typical designated levels for these constituents. <br /> Based on the Twinning report and previous analytical data,I conclude that composting operations did <br /> not significantly impact underlying soils. <br /> The facility's WDRs require that all wastes, natural geologic materials contaminated by wastes, and <br /> surplus or unprocessed composting materials be completely removed from the site when composting <br /> operations have ceased. Grover Landscaping Services has met this requirement. Therefore, I will <br /> recommend to the Board that the WDRs be rescinded. <br /> If you have any questions,please call me at(916) 255-3131. <br /> STEVE E. ROSENBAUM <br /> Associate Engineering Geologist <br /> SER <br /> cc: Mr. Ron Rowe, San Joaquin County Public Health Services, Stockton <br /> Mr. Bing Kirk,Atherton Kirk Development Company, Stockton <br /> Mr. David Sholes,Twinning Laboratories, Fresno <br /> California Environmental Protection Agency <br /> eel' Recycled Paper <br />