Last week I did some very large patches, one covered half the customer's lawn, about 4K sq/ft., the other about 1500 sq/ft. Both jobs involved trucking in material, grading, seeding and starter fert. Since Friday, we got about 15 inches of rain, and both jobs are damaged. One will need significant reworking to repair, the other just some raking, but both will need to be reseeded and fert applied. My question is...do I have any responsibility to repair these problems? I think I should bill them time and materials consistant with the original job. Any advice on how to discuss this with the customers?