WORK PLANS CASE 2 - Laserfiche WebLink

Home Browse Search

KL E//VFELOER Bright People.Right Solutions. WORK PLAN Limited Groundwater Sampling and Analyses Proposed Land Application Area 7R Oakwood Lake Water District Wastewater Treatment Facility Manteca, California BACKGROUND The Oakwood Lake Water District (OLWD) is located in Manteca, California (Plate 1). Kleinfelder understands that Reclamation District 17 (RD 17) plans to use approximately 44 formerly proposed residential lots for levee improvements. OLWD is therefore proposing to expand the original Land Application Area (LAA) No. 7 to include these 44 lots (Proposed LAA No. 7R, See Plate 2). The Regional Water Quality Control Board (RWQCB) has stated in a meeting on March 10, 2010, that additional grab groundwater sampling using push probe technology would be acceptable to obtain additional background information for LAA No. 7R. During the initial evaluation of LAA No. 7, Kleinfelder installed temporary well TW-1 and collected and analyzed groundwater samples in March 2007. This temporary well was approximately 22 feet deep with a screened interval ranging from 9 to 19 feet below ground surface (bgs). Depth to groundwater in this general area, based on relatively recent groundwater surveys, is expected at 13 to 15 feet bgs. Groundwater flow direction is extrapolated to be north by northwest in the immediate investigation area. Initial water quality from TW-1 was relatively poor, and it appeared land application to the relatively small LAA No. 7 would be acceptable. Total dissolved solids, chloride, and sodium were detected at 1,220, 440, and 321 milligrams per liter (mg/1), respectively. Total coliform was detected at > 23 most probable number (MPN) per 100 ml. The following details a scope of work for additional groundwater sampling and analyses in the proposed and expanded LAA No. 7R. PROPOSED SERVICES The following tasks details Kleinfelder's proposed scope of work based upon our understanding of current site conditions and discussions with the RWQCB on March 10, 2010. Task 1 — Permitting and Pre-Field Activities Kleinfelder will submit this work plan for review by the RWQCB. Once approved, Kleinfelder will submit the work plan to San Joaquin County Environmental Health Department (EHD) as part of their permitting process. EHD requires completion of a well boring/probe permit for the site and payment of fees prior to advancement of the probes. Kleinfelder will prepare well boring/probe permit 48093.E01/ST010R109 Page 1 of 6 March 26, 2010 Copyright 2010 Kleinfelder