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ENVIRONMENTAL HEALTH DEPARTMENT SAN JOAQUIN COUNTY �qp.• r.co Unlit Supervisors Donna K.Reran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgm n,R.E.H.S. y' "{ Director iE Mike Huggins,R.E.H.S.,R.D.I. Al Olsen,R.E.H.S. Stockton,California 95202-2708 Douglas W,Wilson,R.E.H.S. .. N�.;id:_�,a�P Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. 'FOR Laurie A.Cotulla,R.E.H.S. Program Manager Fax: (209)464-0138 Roben McClellon,R.E.H.S. Mark Barcellos,R.E.H.S. no MW DARIN L. ROUSE JUL 112003 CHEVRON PRODUCTS COMPANY P O BOX 6012 SAN RAMON CA 94583-2324 r RE: Former Chevron Service Station 9-0557 139 South Center Street `" Stockton,California San Joaquin County Environmental Health Department (EHD) has reviewed Work Platt low for Monitoring Well Installation submitted on your behalf by Secor International Incorporated (Secor). In this work plan, Secor proposes to advance one cone penetrometer test (CPT) boring to approximately 130 feet below ground surface (bgs) to assess soil lithology, stratigraphy, and potential petroleum hydrocarbon contamination prior to installing an adjacent deep groundwater monitoring well. EHD approves the advancement of the proposed CPT boring to approximately 130 feet bgs and the installation of one deep monitoring well with a screen interval of approximately five feet_ Secor proposes the total depth of the deep well to be approximately 80 feet; however, Secor states that specific well details, including total depth and screened interval, will be determined based on soil conditions identified in the CPT boring. EHD has reviewed the boring logs for CPT-5, CPT-SA, and CPT-6 and low notes that low pore pressure zones do not appear at approximately 75 to 80 feet bgs; however, in boring logs for CPT-5A and CPT-6, there is a low pore pressure zone at approximately I03 to 107 feet bgs, and in CPT-5A there is another low pressure zone at •• approximately 113 to 118 feet bgs. Therefore, EHD recommends that the deep well screen interval be targeted at either approximately 105 or 115 feet bgs. Please analyze groundwater samples for diesel and motor oil in addition to the proposed analyses for total petroleum hydrocarbons as gasoline, benzene, toluene, ethyl benzene, total xylenes, and methyl tertiary-butyl ether. .. Please submit a drilling permit application along with an $89.00 permit fee to EHD by October 17, 2005. Also provide EHD with a copy of the health and safety plan for our information prior to the fieldwork, and notify EHD at least 72 hours prior to commencing the fieldwork. ' JUL 12 2005 L r. B,-1....................-