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below laboratory detection 1SRfits. <br /> Groundwater- <br /> GP-1; TPHg = 17,000 ppb, Benzene = 44ppb, MtEE _ <10 ppb. <br /> GP-2; 16,000, 170, <25 <br /> GP-3; 4,100, <10, <10 <br /> GP-4; <50, <0.50, <0.50 <br /> GP-5; <50, <0.50, <0.50 <br /> We will step-out from GP-1 to the SE corner of Mingo Way and Cambridge <br /> Street. From GP-2 to the SW corner of Mingo Way and Cambridge Street. <br /> Based on the location of GP-3 (I had to move the original boring <br /> approximately 55' from the intersection due to driveways and underground <br /> utilities) and the concentration of TPHg, I do not believe the original <br /> step-out boring will delinieate the hydrocarbons (the original step-out was <br /> placed approximately 60 feet from GP-3) . Since I noticed a hydrocarbon odor <br /> from the water sample, I marked another step-out boring location an <br /> additional 75 feet from the original step-out boring. I would prefer to <br /> drill the further step-out boring (located approximately 135, from GP-3) in <br /> order to get delineation on Libby Lane. <br /> If I notice hydrocarbon odors from the groundwater from the step-out borings <br /> of GP-1 and GP-2, I would like to step-out an additional 100 feet from from <br /> each boring (on Cambridge Street and Mingo Way, respectively) and do those <br /> Geoprobes the same day. <br /> I will call Fisch Enviromental to see the availability of a Geoprobe for the <br /> next round and I will call you to schedule the job. <br /> Please let me know if you agree with the additional step-out borings. I you <br /> approve them, I will USA the additional locations and schedule private <br /> utility locating. Additionally, please let me know if I have to do any <br /> additional permitting through your office. <br /> Sincerely, <br /> Thomas Y. Parker <br /> Staff Geologist <br /> SECOR International, Inc. <br /> 3017 Kilgore Road, Suite 100 <br /> Rancho Cordova, CA 95760 <br /> (916) 861-0400, ext. 232 <br /> (916) 861-0430 FAX <br /> 2 <br />