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KLEINFELDER <br /> January 8, 1993 <br /> File 24-220172-A00 <br /> Ms Linda Turkette f1 <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 455 San Joaquin Street ENVIr, ,� <br /> Stockton, CA 95201 �, -�y -� ,,!C w3 <br /> Subject: Ground Water Assessment Work Plan <br /> Ground Water Gradient Review <br /> Cal West Concrete Cutting, Inc. <br /> 1153 Vanderbilt Circle <br /> Manteca, California <br /> Dear Ms Turkette <br /> As part of the ground water assessment at Cal West Concrete Cutting, Inc (Cal West), <br /> Klemfelder reviewed ground water assessment reports for a facility at 575 Industrial Park <br /> Drive to assess the local ground water gradient According to the two reports received, two <br /> phases of ground water assessment were performed by Treadwell & Rollo, Inc at <br /> 575 Industrial Park Drive The first phase, performed in July 1990, consisted of the <br /> installation of a single boring to ground water and sampling from the open boring No <br /> gradient information could be derived from this report <br /> The second phase, performed in August and September 1991, consisted of the installation of <br /> three monitoring wells and two rounds of ground water sampling The first round of samples, <br /> including water level measurements for gradient evaluation, were collected on August 23, <br /> 1991. A second round of samples and water level measurements were collected on <br /> September 17, 1991. For both rounds, the ground water gradient was calculated to be <br /> approximately 0.0026 feet per foot in a northwest direction (from Ground Water Conditions <br /> Report for 575 Industrial Park Drive by Treadwell & Rollo, Inc. dated November 5, 1991, <br /> page 8) Copies of Table 1 - Summary of Ground Water Elevation Data and Figure 2 - Site <br /> Plan (showing the well locations and the calculated direction of ground water flow) are <br /> included for reference from the Treadwell & Rollo, Inc report <br /> Based on the above information, Kleinfelder proposes the installation of a single monitoring <br /> well to the northwest of the previous tank excavation at the Cal West site per the protocol <br /> described in our Ground Water Assessment Workplan for Cal West Concrete Cutting, Inc <br /> dated October 29, 1992 The approximate location of the proposed well is shown on the <br /> enclosed revised version of Plate 1 - Possible Well Locations (from Kleinfelder's workplan of <br /> October 29, 1992) <br /> Sincerely, <br /> KL7LDER, C <br /> Enc S Fin lay, R G <br /> Senior Geologist <br /> cc Brick Joseph, Cal West Concrete Cutting, Inc <br /> FL6-2(1993) <br /> copyright 1993 Kleinfelder, Inc <br /> KLEINFELDER 3077 Fite Circle, Sacramento, CA 95827 (916) 366-1701 <br />