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i <br /> t+� <br /> WATERWORK <br /> r GEOCHEMICAL GEOTECHNICAL ENVIRONMENTAL <br /> f:n .lune 30, 1988 <br /> Stella Ruiz <br /> Ruiz Grocery Rf <br /> . <br /> IP.L Fltx!T <br /> 4491 West Durham f FerryRoadi1�'tt� " tiER�)Cs'Tracy, CA 9537$ �ERi�111/- <br /> Dear Mrs. Ruiz: <br /> !a <br /> The following letter outlines the results of our site <br /> investigation Of potential groundwater contamination conducted at <br /> the Ruiz Grocery, 4491 West Durham Ferry Road, in 'Tracy (Figure <br /> 1) . This investigation was conducted in response to requirements <br /> ;:9 of the San Joaquin Local Health District (SJLHD), in accordance ` <br /> with our pre-approved workplan. <br /> P32 A previous investigation at the site encountered gasoline <br /> i . contaminated soils during the drilling of two soil borings <br /> >, adjacent to a 1000- gallon underground (u/g) storage tank which <br /> contained unleaded gasoline (Figure 2) . Hydrocarbon <br /> contamination was confirmed by laboratory analysis of four soil <br /> 3, samples collected from the two borings. Sample ,analysis from a <br /> domestic well located approximately 75 :feet"from this' 'tank` did <br /> •� r not . indicate the presence of gasoline hydrocarbons above method <br /> detection limits. This'°well- has .subseguently been abandoned. A <br /> new domestic.:-well <br /> -instal-led near the .abandoned well in December <br /> 2987 was tested and did not record total petroleum hydroc:ixbons <br /> I ? (as gasoline) above the 100 <br /> Parts per billion {ppb} detection <br /> Additional testing of this well for benzene, toluene and <br /> xylene conducted April 28 and June 13, 1986 did riot record <br /> concentrations of these constituents above method detection <br /> limits In` addition, concentrations of gasoline, diesel and <br /> kerosene were all below method detection limits for the May 26 <br /> sampling (Appendix I) . <br /> On May 27, 1988 a soil boring was .advanced to a depth of 28 feet <br /> below <br /> grade . for the purpose of insG:alling a groundwater <br /> monitoring well. Drilling was conducted with a Mobile B-61 rig <br /> ,.r; using eight inch (O.D. ) diameter hollow stem augers. The <br /> drilling was performed under the direction of a field geologist <br /> who maintained a continuous log of the materials encountered � 4 <br /> using the Unified Soil Classification System (Appendix 1l) . Soil' <br /> samples were collected for field characterization of soil type <br /> and illspe`cted for the presence of hydrocarbon contamination. <br /> Core samples were collected in 2 inch diameter brass tubes using <br /> a California modified sampler. Select samples were -collected, <br /> preserved and transported under chain of custody in accordance <br /> with standard EPASam.rotocolles taken from six and eleven <br /> P p <br /> -- - - - <br /> ahs foot-depths-wets-analyzed for-tenzene,-toluene, xylene (BTX) and <br /> total petroleum hydrocarbons as gasoline <br /> (Tpfl) by . California <br /> MT <br /> State .Department :of Health Services testing methodology. <br /> POSTOFFICE BOX 554G RENO.NEVAnA (151 1-1 17CY°1 7 irl t,i9'try <br /> III I M W191 MW Em <br /> a'' <br />