SITE INFORMATION AND CORRESPONDENCE

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I PUBL,. 0 HEALTH SEI ,, * ICES �op4 N' .cpG SAN JOAQUIN COUNTY Q JOGI KHANNA M.D., M.P.H. Health Officer P.O. Box 2009 • ( 1601 East Hazelton Avenue) • Stockton, Califomia 95201 i (209) 468-3400 SEP 2g 1993 REMO CANEPA CANEPA ' S CAR WASH 248 E PARR ST STOCKTON CA 95202 RE : 6230 PACIFIC AVENUE SITE CODE : 1225 STOCKTON San Joaquin County Public Health Services , Environmental Health Division ( PHS /EHD ) has completed review of the report prepared by WHF Environmental Consultants , Inc . entitled "Progress Report on Tank Removal and Fuel Line Leak & Work Plan for Monitoring Wells " dated May 13 , 1993 . The workplan for the installation of monitoring wells is approved and the permit application has been receipted and issued under $93 - 1950 . The events leading to this point warrant explanation . The underground fuel storage tanks ( USTs ) were removed under PHS /EHD permit February 25 , 1993 . Contamination was observed visually and odoriferously during the tank removal at a depth of 12 feet below grade . The nature of the site ' s business as a car wash and its location within a highly utilized shopping area of businesses and restaurants , PHS /EHD issued a verbal directive February 26 , 1993 to commence preparation for corrective action . A " Site Remediation Workplan " was submitted March 1 , 1993 by B & C Construction for overexcavation of contaminated soil within the original tank pit and a sampling plan for the piping area under the canopy . The workplan was approved by PHS /EHD as submitted . Public notification of the pending correction action was posted on site February 26 , 1993 . strong to moderate odors of petroleum hydrocarbons were observed during the March 31 1993 sampling event under the canopy at a depth of 5 feet . A test soil boring to a depth of 56 feet was executed to estimate the vertical range of petroleum contamination and to evaluate the need for a groundwater investigation . Based upon the field observations of PHS /EHD inspection staff and the sensitivity of the site ' s location , you were directed to contract the services of a professional consultant to prepare a comprehensive remedial action plan to address the contamination within the piping area . WHF Environmental Consultants , ' DI Inc . submitted the March 5 , 1993 workplan for a soil vapor extraction system via ' i the installation of a series of vadose monitoring wells . The soil vapor O extraction system was constructed April 2 , 1993 . Vapor extraction has not commenced , to date , as you are awaiting permit authorization from the Air Pollution District . The groundwater investigative phase will commence within the next few weeks with the installation of 3 monitoring wells . The " Progress Report " document submitted by WHF noted that one sample location identified from the previous tank pit contained elevated levels of ethylbenzene , toluene , and xylene ( Station #16 , E . Wall , N End ) . It appears , however , that vadose monitoring wells PSV1 and/or *SV2 may be within the radius of vadose influence . A pilot test of the vadose system will be necessary in order to verify the effectiveness of the well ' s placement . A Division of San Joaquin County Health Care Services