ARCHIVED REPORTS_2006_7 - Laserfiche WebLink

Home Browse Search

WASTE DISCHARGE REQUUI ENMNTS ORDER.NO.R5-2003-0049 FORWARD INC. AND ALLIED WASTE I DUSTR p-S FOR OPERATION O FORWARD CLASS B LANDFU.L SAN JOAQUlN COUNTY (see Findings No. 35mid 36). Since volatile organic compounds tie not naturally occuiring and thus have no background value,they are not amenable to the statistical analysis procedures contained in Title 27 for the determination of a release of wastes from a UWt. 31. Sections 20415(e)(8) tend(9) of Title 27 provide for the non-statistical evaluation of monitoring data that will provide the best assurance of the earliest possible detection;of a release from a Unit in accordance with §20415(b)(1)(B)2.-4. of Title 27. However, Title 27 does not specify a specific method for non-statistical evaluation of r.�onitorin9 data. 32. The Board may specify a non-statistical data analysis method pursuant to Section 20080(a)(1) of Title 27. Section. 13360(a)(1) of the California Water Code allows the Board to specify requirements to protect underground or surface waters from leakage from a solid waste site, which includes a method to provide the best assurance of determining the earliest possible detection of a release. 33, In order to provide the best assurance of the earliest possible detection of a release of non- naturally occurring waste constituents from a Unit, this Order specifies a non-statistical method for the evaluation of monitoring data. 34. The specified non-statistical method for evaluation ofrr nitori:ng data provides two criteria (or triggers) for making the determination that there has been a release of non-naturally occurring waste constituents from a Unit. The presence of two non-naturally occurring waste constituents above their respective method detection limit(ML),or one non-naturally occurring waste constituent detected above its practical quantitation limit(PQL), indicates that a release of waste from a Unit has occurred. Following an indication of a release, verification testing will be conducted to determine whether there has been a release from the Unit, or there is a source of the detected constituents other than the landfill, or the detection was a false detection. Although the detection of one non-naturally occurring waste constituent above its MDT is`sufficient to provide for the earliest possible detection of a release, the detection of two non-naturally occurring waste constituents above the MDL as a trigger is appropriate due to the higher risk of false-positive analytical results and the corresponding increase in sampling and analytical expenses from the use of one non-naturally occurring waste coristiruent above its MDL as a trigger. GROUNDWATER DEGRADATION 35. Significant VOC impacts to groundwater including but not Limited to dichloroethane, dichloroethylenc, tetraclilo7roethylene, and trichloroethylene are associated with the old Austin Road Landfill, now the;north Unit at Forward landfill. Impacts were initially detected in 1989, by 1991 evaluation monitoring determined that chlorinated .hydrocarbons impacts extended as liar as 1,000 feet down-gradient from the Austin Road landfill. A corrective action was approved in 1991, by 1998 it was apparent that the initial corrective actions had 6 d O 12090£££9 'ON/99 1 l 'iS/89: £l 90N O l IV (NOW) Nodi