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*DFEDDMED <br /> THOMPSON-HYSELL ENGINEERS Nov o 2 2000 <br /> a division of The Keith Companies, Inc. ENVIRONMENT HEALTH <br /> PLANNING ■ ENGINEERING ■ SURVEYING <br /> PERMIT/SERVICES <br /> x0;: : - 1016 12th Street ■ Modesto, CA 95354 ■ (209) 521-8986 ■ FAX (209). 521-9045 <br /> � rt19� <br /> September 25,2000 <br /> Mr.Steve Harris <br /> Terrasearch Inc. <br /> 11840 Dublin Blvd. <br /> Dublin,CA 94568 <br /> Subject: Riverwalk Water Reclamation Facility—Additional Geotechnical Investigation <br /> Dear Steve: <br /> We have obtained additional information form the City of Lathrop and Regional Water Quality Control. <br /> Board regarding the permitting of the Riverwalk Water Reclamation Facility. Unfortunately, this will <br /> require us to do additional geotechnical field work and analysis on the site. Below is a summary of the <br /> additional geotechnical information we will need from Terrasearch: <br /> 1. Long term percolation rates from the effluent storage pond— Please proceed on determining the long <br /> term percolation rates based upon the method discussed using two test pits. The location of the test <br /> pits should be per our previous fax. <br /> 2. Groundwater quality information—It appears we will need to be able to monitor water quality over the <br /> next several months. Therefore,what I propose we do is place a series of monitoring wells around the <br /> water reclamation facility site rather than boring test holes every time we need a sample. The attached <br /> fax shows the tentative monitoring well locations. If field and farming conditions requires moving the <br /> proposed location I do not think it would be a problem. <br /> 3. Sampling—Based upon our discussions with City and Board Staff,we will need to analyze the samples <br /> for the next several months, maybe longer. We will also need to draw a test sample from the San <br /> Joaquin River for analysis. The certified analytical results should include pesticides, volatile organic <br /> compounds (VOC's), and the constituents from a"Title 22" drinking water analysis. I have attached <br /> water quality analysis which is similar with the exception of the analysis for pesticides. <br /> You will need to coordinate the field work with the farmer and land owner. <br /> If you have any questions,please feel free to contact me. <br /> Pck S.Garvey ' n L) <br /> atri <br /> Sr.Project Manager <br /> Enclosures <br /> cc: John Hughes,Award Homes <br /> Darrel Dixon,Thompson-Hysell Engineers <br /> P:\LATHROP\12208702\docs%anis2.dm-rkc <br />