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GEO-PHASE <br /> ENVIRONMENTAL <br /> 13 March 2006 <br /> GPE Project No.:480.2 RECENED <br /> Ms. Cori Condon <br /> Regional Water Quality Control Board MAR 1 6 2006 <br /> 11020 Sun Center Drive, Suite 200 <br /> Rancho Cordova, CA 95670 ENVIRCI'�1 LENT HEALTH <br /> PERMIT/SERVICES <br /> Re: Valley Water Site <br /> 612 N Buena Vista, Stockton,CA <br /> Dear. Ms. Condon, <br /> The subject sight is the target of separate remedial investigations of releases of gasoline from <br /> a former UST, and a release of salt from a brine pit. Both releases have impacted the <br /> groundwater. I have attached our 2005 report of soil borings that first identified the salt <br /> release. The site is adjacent to the Stockton Deep Water Ship Channel. Based on <br /> photogrametry, the actual distance from the point of release to the water's edge is <br /> approximately 210 feet. <br /> The San Joaquin County EHD directed that groundwater monitoring wells be installed to <br /> investigate the gasoline release. Four shallow monitoring wells were constructed and sampled <br /> in December. The wells were later surveyed in accordance with Geo-Tracker requirements <br /> and a sensitive receptor survey was completed. I have attached a copy of our report <br /> documenting this work. As shown in the report, the direction of groundwater flow is almost <br /> due north, directly away from the ship channel <br /> At the same time the groundwater samples were collected for petroleum hydrocarbon testing, <br /> separate samples were collected and tested for the presence of total chlorides and totals <br /> dissolves solids (TDS). For purposes of comparison a water sample was also collected <br /> directly from the ship channel, I have attached photocopies of the laboratory data sheets. In <br /> addition, the following table summarizes the analytical results: <br /> Sample I.D. Chloride TDS <br /> MW-1 4,900 8,200 <br /> MW-2 260 1,100 <br /> MW-3 190 960 <br /> MW-4 2,300 4,400 <br /> Ship Channel 160 500 <br /> MDL 1 10 <br /> Units m L m L <br /> • <br /> 2937 Veneman Ave.,##13240 Geo-Phase Environmental Inc. Phone: (209) 569-0293 <br /> Modesto, Ca 95356 Fax: (209) 569-0295 <br />