ARCHIVED REPORTS XR0000872 - Laserfiche WebLink

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Again, attached is a summery of water testing INTERPRETATION OF BORINGS AND MONITORING The soil lithology forthe Vogue Cleaners site is characterized by alternating layers of clays and silts that are cut and filled with sand lenses. There is a sand lense at 70' depth,at 50' depth, and at 25' depth Attached is a 24"x36" isometric crossection of the site to a depth of 75' The culmination of past monitoring events indicate that there is a plume of BTEX and TPHg at a depth of 50'and approximately 20'thick The BTEX and TPHg plume contains about 7 3L(2gaI)of Benzene and about 371 L(98gal)of TPHg There is a second plume which contains 1,2-DCA The I,2-DCA plume is at a depth of 70' and approximately 25'thick The 1,2-DCA plume contains about 27L(7gal)of 1,2-DCA Attached is a plan view showing the limits of the two plumes The plumes are contaminants that have dissolved into the water The plumes is not free product moving within the soil particles RECEPTOR SURVEY The receptor survey is attached The Receptor Survey indicates that there are no drinking water wells within 2,000'of Vogue Cleaners,but there are three irrigation wells within the 2,000' They are as follows Owner Pump Use I St Joseph's Hospital 20HP Irrigation Only 2 San Joaquin County Catholic Cemetery I5HP Irrigation Only 3 Stockton Rural Cemetery 50HP Irrigation Only 4 Vogue Cleaners 1/414P None Functional At the time this report was written, it was discovered that Vogue Cleaners has an existing well inside the building that has been non-functioning for sometime NATURAL ATTENUATION The trend lines on the attached graphs show that natural attenuation is takmg place at a rate of about 6% per year CONCLUSION Of the listed constituents with consistent positive results, the only ones that remain over EPA MCL's are Benzene, and 1,2-DCA The constituents have experienced a natural attenuation of about 6% per year It is also expected for this downward trend to continue Due to the distance, position,and use of existing wells,the risk to the public is very low The level of risk to the public can be further reduced by placing a new monitoring well to the East to determine the Easterly boundary of the plume 3