WORK PLANS - Laserfiche WebLink

Home Browse Search

v � kn KLEINFELDER comply with the South Manteca E1R. If the RWQCB or the DTSC has specific knowledge of the alleged application of the rinse water to the orchard area we respectfully request that they make that information available, from which we would comply with a revision to the sampling locations noted to include the orchard area. ITEM 2 Section 3.1.2 on Page 5 states that the locations of the upgradient and downgradient monitoring wells are shown on Plate 2. Plate 2 does not show the proposed well locations. A figure showing the proposed well locations need to be provided. As requested Plate 2 has been attached. Plate 2 shows the location of the proposed monitoring well locations. ITEM 3 Section 3.1.2 on Page 6 states that the two proposed monitoring wells will be surveyed to allow the assessment of groundwater gradients. Regional Board and DTSC staff do not concur that two monitoring wells are sufficient to determine the groundwater gradient. Additional information is needed regarding another well in the area with an appropriate screened interval to use for triangulation, or you need to install an additional monitoring well. As requested a third monitoring well location has been added to the proposed scope of work. ITEM 4 The Revised Work Plan proposes metal analyses, but does not specify which metals or analytical methods. This information must be provided. As requested the following laboratory method and list of metals is included. The proposed metals analyses will be performed by EPA Method 601013. The list is the CAM 17 metals. The laboratory list of metals to be included in the laboratory analysis is as follows: Antimony, arsenic, barium, beryllium, cadmium, chromium, cobalt, copper, lead, mercury, molybdenum, nickel, selenium, silver, titanium, vanadium, and zinc. ITEM 5 Due to the volatile chemical nature of many of the constituents of potential concern, soil gas samples are needed in the concrete washout pad and all former chemical storage areas. Soil gas samples at this point of the investigation appears to be more detailed than is warranted at this time. The investigation as proposed is designed to be of a probative scope of work to determine the presence/absence of contaminants on the site and assess their potential impact if present. We respectfully request to defer the task of collecting soil gas samples until after the 27125.WP1 /STO3L443 Page 2 of 5 Copyright 2002,Kleinfelder, Inc. August 18, 2003